The plant was collected during botanical surveys in 2025, when two specimens were found in lower montane forest with small bamboo. It grows among leaf litter in shade at elevations of 950–970 metres. Thismia daemona is an achlorophyllous herb with coralliform, pubescent, light-brown roots. Its erect, unbranched stem is 35–65 mm tall and bears one to three sessile flowers, while the complete plant reaches up to 125 mm including the flowers.

The flowers have a dark brown to blackish floral tube measuring 19–22 mm long and 7–14 mm wide. Its outer surface bears six longitudinal ribs, and its inner surface has 12 ribs, irregular transverse bars in the lower half and fine reticulations in the upper half. Translucent white trichomes cover the bars and reticulations. Three thick, fleshy, reddish-orange outer tepals accompany three dark brown to blackish inner tepals. The inner tepals unite apically into a dome-shaped mitre with three lateral openings, three hood-like accessory lobes and three claviform appendages measuring 18–23 mm long.

Six pendent stamens have translucent-blue filaments. Their broad blue connectives are fused laterally into a tube about 8 mm long, and each connective bears a conspicuous longitudinal rib along the inner surface. The species produces a cup-shaped capsule, although no seeds were observed. The name daemona refers to the flower’s devil-like appearance, with dark-orange outer lobes and horn-like appendages.

Morphological comparison found that T. daemona is most similar to T. limkokthayi, a species from Pahang in Peninsular Malaysia. The Thai species differs in having reddish-orange, fleshy outer tepals rather than thinner brownish-orange tepals, an irregularly papillose mitre rather than an almost glabrous one, transverse bars in the lower floral tube, translucent-blue stamens, and no mitre foveae between the bases of the claviform appendages. It can also be distinguished from T. betung-kerihunensis by its blackish flowers and thick outer tepals, whereas that Bornean species has blue-green flowers and thin outer tepals.

For the molecular analysis, the researchers sequenced one specimen of the new species and also generated sequences for T. clavigeroides collected at its type locality. The combined dataset comprised three nuclear markers, SSU, ITS and LSU, and two mitochondrial markers, atpA and matR. It contained 5,498 characters and 27 accessions representing 24 Thismia species, with Haplothismia exannulata from India included as the outgroup.

Individual and combined datasets were evaluated with Bayesian inference and maximum likelihood. The Bayesian analysis used two independent runs with four chains and 10 million generations, with trees sampled every 3,000 generations and 25% of the trees discarded as burn-in. Maximum-likelihood analysis used 10,000 rapid bootstrap replicates. The two methods produced congruent tree topologies. The combined reconstruction placed T. daemona in the Geomitra clade, in a sister position to the Bornean endemic T. betung-kerihunensis, although the authors noted that this relationship was inferred from a limited DNA sample.

The description brings the number of recognized species in Thismia section Geomitra to eight, and the study includes a key for distinguishing them. A preliminary conservation assessment classified T. daemona as Critically Endangered under IUCN criteria B2ab(iii), D. The species is known from one population in a protected area that receives regular tourist visits, which the authors identify as a threat to its habitat. Its extent of occurrence could not be calculated from the single known point; the formal area of occupancy was estimated at 4 km², while the known population occupies no more than 0.05 km² and fewer than 50 individuals were observed. The species is currently documented only at the type locality, although the authors state that similar vegetation elsewhere in western Thailand or Myanmar may also be suitable for it.

Subject of Research: Taxonomic identification and preliminary conservation assessment of a new Thismia species from Thailand

Article Title: Thismia daemona ( Thismiaceae ), a new species from Thailand supported by morphological and molecular evidence

Article References: Seelanan, T., Chantapram, I., Taosiri, N., Chuchuea, C., & Chantanaorrapint, S. (2026). Thismia daemona (Thismiaceae), a new species from Thailand supported by morphological and molecular evidence. PhytoKeys, 278, 177-189. https://doi.org/10.3897/phytokeys.278.202868

Image Credits: AI Generated

DOI: 10.3897/phytokeys.278.202868

Keywords: Thismia daemona, new species, plant taxonomy, mycoheterotrophy, Thismiaceae, Thailand, DNA phylogeny, morphology, Critically Endangered, biodiversity, Thismia, daemona

The critically endangered eyelid gecko is narrowly endemic to fragmented karst habitats within and around Shimentai National Nature Reserve in Guangdong Province, China. Its distribution is discontinuous, and the intervening non-karst matrix restricts movement between habitat patches. The species has poor dispersal ability, while its small and isolated populations are potentially vulnerable to genetic drift. The study assessed whether these landscape conditions are associated with genetic structure across the species’ known range.

Researchers conducted nocturnal visual encounter surveys at 10 sites between June 2020 and July 2021. They found 96 geckos, including 10 individuals previously captured within the same transect. No movement between transects was detected, and the maximum straight-line distance recorded among recaptured animals was less than 100 m. Adjacent transects were separated by at least 100 m of non-karst matrix or geographically discontinuous karst patches. On that basis, each transect was provisionally treated as a geographic population, although the researchers described this classification as a working hypothesis to be evaluated by the genetic data.

Tail tips were collected from the geckos and preserved in 95% ethanol at −40 °C. After the recaptured animals were removed, the final genetic dataset included 86 unique individuals. DNA was extracted from the preserved tissue, and 20 microsatellite, or simple sequence repeat, loci were amplified and genotyped by capillary electrophoresis. The loci had first been screened in one animal from each population, and those showing stable amplification and high polymorphism were retained. The analysis covered genetic-diversity measures, F-statistics, estimated gene flow, principal-coordinate analysis, STRUCTURE assignment and a Mantel test for isolation by distance.

The 20 loci contained 67 alleles in total. Across the populations, the mean number of observed alleles was 3.385, the mean effective allele number was 2.424 and the mean Shannon information index was 0.875. Mean observed heterozygosity was 0.480, compared with mean expected heterozygosity of 0.482. Population-level observed allele numbers ranged from 2.000 to 5.400, while fixation indices ranged from −0.208 to 0.065. The authors characterized the overall diversity as moderate and noted that its mean observed allele number was higher than a previously reported value for G. kuroiwae but lower than one for G. orientalis.

Genetic differentiation was substantial across the sampled populations. The mean F_ST was 0.357, with locus values ranging from 0.193 to 0.707, while the estimated gene-flow value Nm averaged 0.516 and ranged from 0.104 to 1.043. The authors interpreted this combination as consistent with gene flow being insufficient to counteract genetic drift. DYa and DYb were the most genetically similar populations, with F_ST of 0.041, a genetic distance of 0.199 and genetic identity of 0.820. DR and PB had the largest genetic distance, 2.806, and the lowest identity, 0.060.

Genetic distance was associated with geographic distance. A Mantel test found a positive relationship between genetic distance and log-transformed geographic distance, with Pearson’s correlation of 0.693 (p < 0.001) and Spearman’s correlation of 0.762 (p = 0.001). Principal-coordinate analysis and STRUCTURE assignment both separated DR from the other nine populations. After DR was excluded, principal-coordinate analysis placed the remaining populations into three groups, while STRUCTURE assigned the 70 remaining individuals to two genetic groups. PB and SQ clustered together, and LT showed genetic contributions from both groups. LT also had greater affinity to the more distant PB and SQ than to the nearby HS and HSb.

The researchers described the Beijiang River as a possible factor contributing to the separation of DR, but noted that this interpretation rested on a single population and was therefore suggestive rather than conclusive. The comparison between these fragmented karst hills and other island systems was likewise interpretive because a direct comparative test was beyond the study’s scope. The genetic results document differentiation and limited connectivity among the sampled populations, but they do not directly demonstrate the precise landscape processes responsible for those patterns.

Given the observed structure, the authors recommended treating different geographic populations as distinct management units for conservation. They called for maintaining the integrity of remaining karst habitats, limiting further fragmentation, and establishing long-term monitoring that combines field surveys, image-based individual identification and molecular data. Such monitoring could track genetic diversity, detect population declines and support future assessments of whether current diversity and population connectivity are sustained under continued anthropogenic pressures and environmental change.

Subject of Research: Genetic diversity and population structure of the critically endangered Yingde’s gecko assessed with SSR markers

Article Title: Genetic diversity and structure analysis of critically endangered Goniurosaurus yingdeensis ( Squamata , Eublepharidae ) based on SSR markers

Article References: Li, Z., Qi, S., Song, H., Wang, H., Zhao, Y., Shi, Y., & Wang, Y. (2026). Genetic diversity and structure analysis of critically endangered Goniurosaurus yingdeensis (Squamata, Eublepharidae) based on SSR markers. Herpetozoa, 39, 39-48. https://doi.org/10.3897/herpetozoa.39.e186041

Image Credits: AI Generated

DOI: 10.3897/herpetozoa.39.e186041

Keywords: Goniurosaurus yingdeensis, Yingde’s gecko, microsatellite markers, genetic diversity, population structure, gene flow, karst habitat, habitat fragmentation, Critically Endangered, conservation genetics, Genetic, diversity

Allium ravenii, commonly called Raven’s garlic, is a perennial geophyte in the amaryllis family known only from saline plains beside the Eastern Chink of the Ustyurt Plateau in Karakalpakstan, Uzbekistan. Its only known population occupies gypsum or calcareous soils at approximately 150 metres above sea level in an extremely arid zone influenced by the drying of the Aral Sea. The locality is also the species’ type locality. Regional climate analyses cited in the assessment indicate increasing aridity and moisture deficits, particularly during spring, while long-term records show that temperature variation has increased in both the cold and warm halves of the year.

Field research in 2009 and 2010 recorded about 20 A. ravenii individuals in full bloom, but a monitoring expedition in 2015 found only six plants, identified in the assessment as mature individuals. Targeted searches during the growing seasons of 2020 and 2021 found no plants, a result following very dry years, including less than 75 millimetres of precipitation in 2020, and a sharp reduction in spring rainfall. The assessors did not classify the species as extinct because underground portions of several mature individuals were found in 2015, indicating that plants could persist below ground when no shoots were visible. Both the extent of occurrence and the area of occupancy were calculated as 4 square kilometres, and the mature population was estimated at about six individuals.

Several pressures converge on that single population. The Ustyurt Plateau and Eastern Chink serve as nomadic pastures for sheep, goats and camels, while saiga antelope and goitered gazelle also graze there. The plateau contains large natural-gas reserves, and several drilling stations operate near the garlic population. The site lies beside the only road crossing the plateau toward the Aral Sea, where irregular traffic includes tourists and equipment used by geologists; satellite images showed more than ten new roads around the population. A single location, continuing decline, habitat deterioration, population fluctuations and the extreme smallness of the population supported classification under Red List criteria B, C and D. The locality is not included in a reserve or other protected area, although Uzbekistan’s national Red Book lists the species under category 1, meaning it is on the brink of extinction.

Centaurea seguenzae, or Seguenza’s knapweed, presents a different pattern of extreme restriction. The perennial species is endemic to the Peloritani Mountains in northeastern Sicily, where its entire known distribution comprises one population and one stand on the rocky slopes of Capo Tindari near Patti. It grows on wind-exposed coastal cliffs at elevations of up to 300 metres, in lithosols formed from Mesozoic marble and calcium-silicate feldspar. Its habitat supports a community of chasmophytic plants. A rough count found more than 250 mature individuals, although inaccessible cliffs mean that the total may have been underestimated. Direct observations showed no significant decline in population size or the number of mature individuals in recent years.

Despite that absence of a measured abundance decline, the habitat of C. seguenzae is deteriorating. The cliffs are susceptible to natural erosion, detachment of individual blocks and landslides, including a small-to-massive landslide near the Verde lagoon in spring 2009. The invasive cactus Opuntia ficus-indica occupies much of the rocky habitat and restricts the space available to the native knapweed, contributing to an ongoing loss of suitable habitat. Potential fires are an additional threat because the surrounding territory is periodically affected by arson. The species has an extent of occurrence and area of occupancy of 4 square kilometres. Its occurrence at a single location, together with continuing decline in habitat quality, led to a Critically Endangered classification under criterion B. This differs from its previous global assessment of Near Threatened.

Some conservation measures are already in place for C. seguenzae. Its population lies within the Laguna di Oliveri–Tindari Special Area of Conservation, part of the European Natura 2000 network. The species was one of the targets of the SiMaSeed project, funded under the Interreg Italy–Malta 2014–2020 programme. Living plants and seeds were preserved at the seed bank of Catania University, which had stored more than 8,000 seeds under accession number SiMaSeed/CT/19/370. The assessors nevertheless called for further research into reproductive biology and population trends, monitoring of human activities in nearby tourist areas and urgent management of invasive alien plants.

Haloxylon persicum, known as white saksaul or ghada, is a small tree distributed broadly from Egypt to China. Its global Red List category is Least Concern, but the regional assessment for Iraq identifies a much more severe situation. Only two small, fragmented Iraqi populations remain in the southern desert of Al-Muthanna Governorate. The larger extends for about 45 kilometres at Busayyah, roughly 100 kilometres south of Al-Nasiriya, while the second lies near Qusair, approximately 20 kilometres south of Hammar Marsh. Both occupy sparsely vegetated sandy dunes without temporary watercourses, where the main water supply is annual rainfall averaging about 93 millimetres. The tree can live for 15 to 25 years, reproduce vegetatively and tolerate high temperatures and drought.

Iraq’s remaining saksaul population has declined dramatically during the past decade. The latest monitoring counted 1,222 juvenile plants, including 356 near Hammar Marsh and 866 at the other site, but no mature individuals. The assessment links the sharp reduction chiefly to indiscriminate removal. Historically, Bedouin communities harvested branches and stems for fuel, which helped safeguard the trees; more recently, collectors have cut the roots of large adults for hookah smoking. Loggers reportedly severed stems close to the ground and pulled root systems with vehicles, compromising vegetative reproduction. Local residents described mature saksaul as reaching five metres and providing shade for as many as four camels, whereas the surviving juveniles were about 0.4–0.7 metres to approximately 1.6 metres tall.

Grazing by camels, sheep and goats, dust generated by traffic on unpaved roads, recreational camping, off-road vehicle use and three consecutive years of severe drought added further pressure to the Iraqi populations. The area has also experienced severe continental temperature extremes, including 53.8 °C at Basrah Airport from 1949 through March 2022 and −13.8 °C at Samawa in January 2020. With no mature individuals, 1,222 juveniles divided among two subpopulations and a continuing decline, the Iraqi population was classified as Critically Endangered under criteria C and D. No dedicated protection measures for H. persicum are currently in place in Iraq. The assessors recommended monitoring, in situ and ex situ conservation, possible translocation and public awareness work, particularly among young people. They emphasized that conservation is also a social, legal and cultural issue connected to changing tribal customs.

Subject of Research: Global and regional Red List assessments of three threatened plant taxa

Article Title: Global and Regional IUCN Red List Assessments: 14

Article References: Fenu, G., Al-Rammahi, H. M., Cambria, S., Cristaudo, A. E., Khabibullaev, B. S., Mohammad, M. K., Shomurodov, K. F., Tavilla, G., & Orsenigo, S. (2022). Global and Regional IUCN Red List Assessments: 14. Italian Botanist, 14, 81-94. https://doi.org/10.3897/italianbotanist.14.97176

Image Credits: AI Generated

DOI: 10.3897/italianbotanist.14.97176

Keywords: IUCN Red List, Critically Endangered, plant conservation, Raven’s garlic, Seguenza’s knapweed, white saksaul, Uzbekistan, Sicily, Iraq, arid ecosystems, Global, Regional

The story of Moema claudiae is, in many ways, the story of seasonal fishes in crisis. Rivulids, the family to which this species belongs, are among the most remarkable of all freshwater fishes. Several lineages have evolved to complete their entire lives in water bodies that exist for only a few weeks or months each year. Their embryos survive the dry season buried in the muddy substrate, sealed inside a state of metabolic and developmental arrest known as diapause. When the rains return and the pond refills, development resumes, the eggs hatch, and a new generation races to grow, court, spawn, and die before the water evaporates again. This extraordinary life cycle is precisely what makes them so vulnerable: the small, temporary wetlands they depend on are easy to drain, plow, and pave.

Bolivia illustrates that vulnerability with particular force. Of the 32 rivulid species recorded in the country, 19 are endemic, and nine are known only from their original collection sites. Of the 20 species assessed for the IUCN Red List, eight fall into some threatened category. Moema claudiae, described by Wilson Costa in 2003, is the sole Bolivian member of the family classified as Critically Endangered, under criterion B2ab(iii), reflecting its tiny area of occupancy, its known presence at a single location, and the ongoing degradation of its habitat quality. The type locality lay in the floodplains of the río San Pablo beside the Santa Cruz–Trinidad road, about 60 kilometers north of Ascención de Guarayos in the Iténez/Guaporé River basin. That place no longer exists as the fish knew it. A village was built on the site, and the surrounding landscape was transformed into extensive agroindustrial fields, stripped of forest, altered in hydrology, and contaminated with herbicides, insecticides, and fertilizer.

Repeated collecting expeditions to the vicinity of the type locality failed to find the species. The effort was not in doubt; other rivulids from the same area, including Moema beucheyi, Pterolebias longipinnis, and Spectrolebias filamentosus, continued to turn up both in scientific collections and in the ornamental fish trade, demonstrating that the habitat, degraded as it was, could still support seasonal killifishes. Yet M. claudiae itself remained invisible. A photograph of the original type locality, published in 1997 in connection with S. filamentosus and probably depicting the same site or one very close to it, showed dense vegetation that can no longer be found for kilometers around. Absence of evidence, combined with catastrophic habitat loss, was stacking up into evidence of absence.

In April 2024, two researchers set out with dual goals: to rediscover M. claudiae in the surroundings of its type locality or, failing that, to gather additional evidence of its likely extinction. What they found exceeded both objectives. In a seasonal blackwater pool in the drainage of the Mocovi River, part of the Ibaré River basin in the Marbán province of the Beni department, they collected specimens that matched every diagnostic character of M. claudiae as laid out in the original description. The site sits roughly 100 kilometers northwest of where the species was first found, and within a small forest remnant surrounded by crops.

The rediscovery location is as biologically remarkable as the fish itself. The biotope is a temporary flooded-forest pool no more than 0.4 meters deep, its bottom a layer of leaf litter over grey clay, with no submerged or floating aquatic vegetation and only sparse emergent grasses along the riparian edge. Alongside M. claudiae, the researchers documented six other syntopic rivulid species: M. beucheyi, Neofundulus aff. splendidus, Papiliolebias habluetzeli, Pterolebias longipinnis, S. filamentosus, and Trigonectes rogoaguae. That brings the total to seven seasonal killifish species coexisting in a single water body, the highest number ever recorded. Previous studies had documented at most five species together, with six considered possible if species from nearby water bodies were included. The ecological explanation proposed by the authors is geographic convergence: the site lies where the watersheds of the Mamoré and Iténez/Guaporé sub-basins of the upper Madeira meet, and where Amazonian forest collides with the savannas of the Llanos de Moxos, allowing species from different biogeographic traditions to share the same temporary pond, each exploiting a subtly different functional niche.

The specimens themselves provided the first live photographs ever published of the species. Until now, the only image of M. claudiae was a greyscale drawing in the original description. The new images confirm the hallmark that distinguishes M. claudiae from all its congeners in the same color-pattern species group: a conspicuous, large, vertically elongated black humeral blotch in males, a feature that is absent, inconspicuous, or much smaller in related species. Males in the collected series reached up to 39.1 millimeters in standard length and females up to 32.7 millimeters. The team documented live coloration using controlled lighting and preserved voucher specimens, deposited in the Ichthyological Collection of the Museo de Historia Natural Noel Kempff Mercado in Santa Cruz de la Sierra under catalog numbers MNKP-16794 and MNKP-16795, with collection conducted under authorization from Bolivia’s national competent authority.

Behind the celebration, however, lies a sobering arithmetic. Between 2001 and 2024, Bolivia lost nearly 9.8 million hectares of tree cover, with more than half of that loss in primary humid forests, according to Global Forest Watch data cited in the study. The deforestation has been concentrated in the lowlands of northern Santa Cruz and, more recently, in southern Beni, precisely the region where M. claudiae survives. In 2024 alone, more than 1.8 million hectares of tree cover vanished, mostly primary forest, taking with them countless potential habitats for seasonal killifishes. The drivers are largely political and economic: policies promoting agroindustrial expansion in eastern Bolivia have accelerated clearing in recent years, and the authors see little prospect that the trend will slow in the near future. Every hectare of temporary wetland converted to soy or pasture is a hectare in which diapausing eggs in the soil have no chance of ever hatching.

This is what makes the rediscovery both exhilarating and precarious. The pond where M. claudiae clings to existence lies within a small forest remnant hemmed in by crops, meaning the entire known global population occupies a habitat island under constant pressure. Because the species is an annual fish, its persistence depends on the continued annual flooding and drying of this exact site; a single drainage alteration, a diverted watercourse, or a bulldozer’s pass through the remnant could extinguish it permanently. At the same time, the discovery of seven coexisting rivulid species makes the site arguably the most important known locality for the family in South America, a convergence of hydrography, forest, and savanna that has no documented parallel.

The authors hope that the location will be formally protected in the near future, both to preserve the only known living population of M. claudiae and to safeguard the most diverse seasonal killifish assemblage yet recorded on the continent. For now, the species has moved from presumed extinct to critically imperiled but alive, and science has gained its first true look at a fish that survived, unseen, in a shrinking patch of flooded forest while the world around it changed faster than any life cycle evolved for drought could have anticipated.

Subject of Research: Rediscovery of the critically endangered annual killifish Moema claudiae in Bolivia after more than two decades without a confirmed wild sighting

Article Title: Rediscovery of a thought to be extinct beauty: a second chance for conservation

Article References: Drawert, H. A., & Litz, T. O. (2025). Rediscovery of a thought to be extinct beauty: a second chance for conservation. Nature Conservation, 60, 115-124. https://doi.org/10.3897/natureconservation.60.160386

Image Credits: AI Generated

DOI: 10.3897/natureconservation.60.160386

Keywords: Moema claudiae, annual killifish, Rivulidae, Bolivia, rediscovery, Critically Endangered, diapause, temporary wetlands, deforestation, habitat loss, Llanos de Moxos, freshwater biodiversity

The first encounter took place in 2019, when one of the researchers, surveying orchids in Dehong County in Yunnan Province, came across an unidentified member of the genus Oreocharis growing on a rock wall. At the time, the plants could not be confidently assigned to any described species. Only in August 2025, during a carefully planned revisit, did the team manage to document the full range of morphological variation within the population and to search adjacent habitats that looked superficially suitable. Remarkably, no additional populations were found anywhere in the surrounding landscape, a result that immediately raised conservation concerns and sharpened the scientific case for describing the plant as a new species.

Oreocharis is a genus of perennial, rock-dwelling herbs in the gesneriad subfamily Didymocarpoideae, tribe Trichosporeae, subtribe Didymocarpinae. After a major taxonomic redefinition in 2011, which folded several formerly recognised genera such as Ancylostemon into its circumscription, and after a wave of subsequent new descriptions, the genus now contains more than 160 species. Its members are distributed widely across the tropical and subtropical regions of East Asia, and the great majority grow on steep mountain cliffs, typically on siliceous substrates. That preference for vertical, nutrient-poor, structurally complex rock faces has made Oreocharis a classic example of lithophytic specialization, and it also explains why new species continue to turn up in terrain that few collectors ever bother to climb.

The newly described plants are perennial herbs with very short rhizomatous stems and crowded roots, forming a basal rosette of seven to twelve leaves. The leaf blades are ovate to broadly ovate, papery when dried, shallowly heart-shaped at the base, and conspicuously bullate, meaning their upper surface is puckered or blistered between the veins. Dense, long, fulvous, yellowish-brown hairs cloak the petioles, and this character directly inspired the scientific name, whose epithet literally means tawny-haired. The inflorescences are pair-flowered cymes borne in the leaf axils, each carrying two to six zygomorphic flowers with slender yellow tubular corollas roughly two centimetres long. Four fertile stamens are hidden inside the tube, their filaments sharply bent back near the apex so that the anthers, which cohere in pairs, point upward. A single staminode and a ring-shaped disc complete the floral architecture.

It is the combination of yellow corollas and bullate leaves that places Oreocharis fulvovillosa within a small, morphologically coherent species group, and it is the fine details of that combination that set it apart. Among the more than 160 known species, only a handful share this pairing of traits. The new species most closely resembles O. bullata in its vegetative morphology and O. fulva in the form of its corolla, and it shows a general resemblance in leaf shape to O. hekouensis. The authors therefore conducted a rigorous comparative analysis, examining living plants in the field, studying herbarium material at major Chinese and international herbaria, consulting digital images of type specimens through JSTOR Global Plants, and reviewing the relevant taxonomic literature in detail.

The resulting comparison is decisive. Oreocharis fulvovillosa has crenulate, softly scalloped leaf margins, whereas O. bullata is doubly dentate, and the two species differ dramatically in flower and fruit proportions: the corolla tube of the new species is a slender tube of roughly one centimetre, compared with a tube of about 2.7 centimetres in O. bullata, and its capsules measure only one to 1.9 centimetres against 3.0 to 4.2 centimetres in its relative. Against O. fulva, which shares the yellow tubular corolla, the new species is separated by its strongly bullate leaves and crenulate rather than serrate to crenate margins. O. hekouensis lacks bullate leaves, has a much longer corolla tube of 2.4 to 3.0 centimetres, longer calyx lobes of around ten millimetres, stamens fused to the corolla tube for seven to eight millimetres rather than two to two and a half, and larger capsules. Taken together, these differences comfortably justify recognition of the Dehong population as a distinct species.

The formal description rests on a holotype specimen collected on 27 August 2025 at 1,950 metres elevation on the surface of moist cliffs in Mang City, Dehong Dai and Jingpo Autonomous Prefecture, and deposited at the herbarium of the Kunming Institute of Botany, with isotypes at other institutions. The species flowers from August to September and fruits in September. Internally, the anatomy follows the classic gesneriad blueprint: the ovary is single-loculed with two bifid, intrusive parietal placentas, the stigma is two-lobed, and the capsules dehisce loculicidally, splitting along the locule walls to release the seeds. The calyx is divided into five nearly equal lanceolate lobes almost to its base, a feature that again helps distinguish the plant from O. bullata, whose calyx is lobed only from the middle.

Perhaps the most consequential part of the paper concerns conservation. Targeted surveys within approximately one kilometre of the type locality failed to locate any additional subpopulations, meaning the entire known global range of Oreocharis fulvovillosa consists of a single cliff face near the summit of one small limestone hill. Using the IUCN standard two-by-two-kilometre grid, the area of occupancy is estimated at just four square kilometres, and the extent of occurrence cannot be meaningfully calculated from a single point. With approximately seventy mature individuals, the species is exposed to stochastic environmental events and to human pressures such as habitat degradation or collection. The authors accordingly assessed it as Critically Endangered under criterion B1ab(iii)+B2ab(iii) and D of the IUCN Red List Categories and Criteria, while noting that the assessment is preliminary and may be revised if future surveys in adjacent karst areas reveal more plants.

Beyond its formal taxonomy, the discovery carries a broader message about isolated karst landscapes. The scattered karst landform patches of western Yunnan, with their thin soils and rugged topography, often retain primary subtropical broad-leaved forest, and the cliff faces beneath these forests create ecological niches in which narrow endemics can persist for millennia. Oreocharis fulvovillosa grows on limestone rather than the siliceous rocks favoured by most of its relatives, hinting at the evolutionary versatility of the genus and at the role of edaphic specialization in driving local diversity. Because many of these karst islands lie outside nature reserves, their unique cliff-dwelling floras remain effectively unprotected, and the authors explicitly call for further investigation, research, and conservation action in such areas before small, irreplaceable populations vanish.

The story also illustrates how modern plant taxonomy actually works. Recent phylogenetic studies based on extensive sampling have clarified species relationships within Oreocharis and confirmed that characters such as corolla form, indumentum, and stamen structure are genuinely informative for delimiting species, giving morphological comparisons a molecular anchor. In the case of the new species, the diagnosis could be framed entirely on reproducible morphological evidence, checked against type specimens held in herbaria across several continents. For now, a tiny yellow-flowered herb with tawny, hairy stalks, known in Mandarin as Dehong zhiban jutai, survives on a single fifty-metre stretch of cliff in Dehong. Whether it remains there for another century will depend less on taxonomic science, which has now done its part, than on whether the fragile karst habitat it inhabits receives the protection it so clearly deserves.

Subject of Research: Taxonomic description and conservation assessment of a new cliff-dwelling plant species from Yunnan, China

Article Title: Oreocharis fulvovillosa ( Gesneriaceae ), a new species from western Yunnan, China

Article References: Wang, Y., Jiang, H., Xu, B., & Han, M.-Q. (2026). Oreocharis fulvovillosa (Gesneriaceae), a new species from western Yunnan, China. PhytoKeys, 276, 17-23. https://doi.org/10.3897/phytokeys.276.182136

Image Credits: AI Generated

DOI: 10.3897/phytokeys.276.182136

Keywords: Oreocharis fulvovillosa, Gesneriaceae, new species, Yunnan, karst, limestone cliffs, Critically Endangered, IUCN Red List, taxonomy, endemic plants, Dehong, China

The story began in August 2025, when the researchers were browsing Douyin, the Chinese version of TikTok, and encountered a video showing a flowering gesneriad in its native habitat. The plant’s white flowers and distinctive rounded upper corolla lobes immediately caught their attention. Its overall appearance suggested a member of the former genus Dayaoshania, a group now merged into the broader genus Oreocharis, but the floral features did not match either of the two species already known from that lineage. After contacting the videographer, the team managed to obtain wild individuals, and careful dissection and comparison confirmed that they were looking at an undescribed species.

The discovery carries particular scientific weight because of the group’s tangled taxonomic history. Dayaoshania was established in 1983 around a single remarkable species, Dayaoshania cotinifolia, found on Dayao Mountain in Guangxi, which bears a butterfly-shaped corolla unlike anything else in the family. For years it was considered a primitive lineage of Gesneriaceae because its stamens are attached near the base of the corolla and its anthers are bilocular and parallel rather than diverging. Molecular phylogenetics later overturned that view, and subsequent studies showed that Oreocharis and a series of similar-looking genera together form a single monophyletic group. In an expanded circumscription, Oreocharis absorbed ten former genera, including Dayaoshania, Ancylostemon, Bournea, Briggsia, Deinocheilos, Isometrum, Opithandra, Paraisometrum, Thamnocharis and Tremacron. Species of the Dayaoshania type are therefore of significant value for understanding evolutionary relationships within the family.

To characterize the new species rigorously, the authors measured morphological characters on ten mature living individuals sampled from different microhabitats within the only known population, covering sun-exposed and shaded as well as wetter and drier sites. Each character was measured three times per individual with digital calipers to minimize observation error, and mean values were reported. Voucher specimens were deposited in the herbarium of the South China Botanical Garden of the Chinese Academy of Sciences. The holotype was prepared from a cultivated flowering plant in May 2025, traced back to material introduced from Shigou Town in Sihui City.

Morphologically, Oreocharis sihuiensis is a perennial herb with a short rhizomatous stem and a rosette of basal leaves. The leaf blades are chartaceous, ovate to broadly elliptic or nearly rounded, and densely white-pubescent on both surfaces. Its inflorescences are branched cymes bearing one to ten flowers, with a corolla that is white externally and marked with rose red at the throat of the upper tube and yellow at the throat of the lower tube inside. The stamens number two, occasionally one or three, and the species possesses three staminodes — sterile stamens — a feature that proves decisive in telling it apart from its closest relatives.

That distinction rests on a suite of precise characters. Oreocharis sihuiensis most closely resembles Oreocharis dayaoshanioides, but differs in having leaf blades that are densely pubescent above with hairs only 0.2 to 0.5 millimeters long, whereas the related species carries sparse to dense villous hairs longer than one millimeter. The lobes of the upper corolla lip are subrounded with a rounded apex, rather than broadly ovate with an acute tip. The new species has three staminodes where its relative has none or two, a disc with a cleft margin rather than a subentire one, shorter filaments of roughly six millimeters compared with eight to twelve millimeters, and capsules about one centimeter long rather than about two centimeters. Compared with Oreocharis cotinifolia, it shows serrulate leaf margins, glabrous pistil and stamens, and a ring-like rather than stellate disc. The authors provide a formal identification key to all three Dayaoshania-type species to separate them reliably.

The species grows on moist slopes and rock walls beneath mixed evergreen broad-leaved and bamboo forest at an elevation of only about 100 meters, flowering from April to May and fruiting from May to July. It is known exclusively from its type locality in Shigou Town, where the entire area of occurrence is estimated at less than 100 square meters. The plant is familiar to local residents under the vernacular name Shi Shang Lian, meaning Lotus Born on Rock, and the formal Chinese name Sì Huì Yáo Shān Jù Tái. The specific epithet sihuiensis honors the type locality, Sihui City.

That local fame is precisely what endangers it. Oreocharis sihuiensis is a well-known ethnobotanical resource, widely harvested by villagers who process the plant into medicinal tea. Its folk name leads to frequent confusion with two varieties of the related Oreocharis benthamii, both traditionally used in Guangdong folk medicine as treatments for liver ailments. The resulting demand has driven intensive over-collection and trade, severely compromising the species’ survival. Compounding the pressure, the surrounding bamboo forest is being felled, fragmenting and shrinking the already minuscule habitat. Field surveys found no juvenile individuals or recruitment, indicating a continuing and rapid population decline, with habitat loss estimated to exceed 30 percent over the past decade. Applying IUCN Red List Criteria D and B2 a, b (ii, iii, v), the authors preliminarily assess the species as Critically Endangered.

Beyond the plant itself, the discovery highlights a novel and double-edged pathway for taxonomic science. Social media platforms can turn ordinary members of the public into unintentional contributors to biodiversity documentation, accelerating the discovery of species that might otherwise go unnoticed. Yet the same channels can expose precise locations of rare plants to poachers and collectors, particularly when the species has horticultural appeal or medicinal value. The authors recommend that conservation authorities and scientific journals establish guidelines for anonymizing or generalizing locality data for critically endangered species while still meeting scientific standards for replicability. In this case, the team deliberately managed the timing of releasing detailed locality information, publishing it only after the formal species description to avoid worsening the threat.

Oreocharis sihuiensis joins a growing list of Chinese gesneriads described in recent years as botanical surveys intensify across the country’s fragmented subtropical forests. Its fate now depends on whether the last scattered individuals near a village in Sihui can be protected from the medicinal trade and habitat destruction that have already reduced them to so few. For a species that announced itself to science through a phone screen, its survival will depend on how quickly that attention translates into conservation on the ground.

Subject of Research: Discovery and conservation assessment of the critically endangered new plant species Oreocharis sihuiensis (Gesneriaceae) from Guangdong, China

Article Title: Oreocharis sihuiensis ( Gesneriaceae ), a critically endangered new species from Guangdong Province, China

Article References: Ji, L.-B., Wen, F., Jin, X.-H., Xu, Y.-D., Li, B.-H., & Tang, B. (2026). Oreocharis sihuiensis (Gesneriaceae), a critically endangered new species from Guangdong Province, China. PhytoKeys, 276, 175-182. https://doi.org/10.3897/phytokeys.276.190710

Image Credits: AI Generated

DOI: 10.3897/phytokeys.276.190710

Keywords: Oreocharis sihuiensis, Gesneriaceae, new species, Guangdong, China, Critically Endangered, IUCN Red List, taxonomy, social media discovery, medicinal plant over-collection, biodiversity, plant conservation

The species was first discovered on a coffee farm in Chu Se District, an unremarkable setting for a remarkable animal. Bent-toed geckos of the genus Cyrtodactylus are notoriously difficult to tell apart by appearance alone, and C. gialaiensis was described from a landscape already transformed by decades of agricultural expansion. Its estimated range covered less than ten square kilometers, and because that range sat wholly outside any protected area, the International Union for Conservation of Nature classified the species as Critically Endangered almost immediately after its formal description in 2018. Earlier surveys had looked only around the type locality, leaving open the question of whether other populations might persist in suitable habitat elsewhere in the province.

To answer that question, a research team conducted extensive field surveys across four districts of Gia Lai Province between March 2022 and April 2025, visiting sites in Chu Se, Duc Co, Chu Prong, and Chu Pah. The team established 28 transects spanning coffee, rubber, durian, padauk, passion fruit, and coconut palm plantations, along with the soil cliffs and remnant vegetation patches that thread through these farmlands. Because the gecko is nocturnal, each transect was visited three times after sunset, between 19:00 and 00:30, when the animals are most active and detection probability is highest. Surveys covered both adobe and basalt soil types, reflecting the region’s diverse volcanic geology.

Identifying the animals required more than fieldwork. The researchers collected tail tissue samples from 18 geckos and sequenced a fragment of the mitochondrial ND2 gene, a standard molecular marker for distinguishing closely related Cyrtodactylus species. Eleven samples, drawn from Chu Se, Duc Co, and Chu Pah, showed 98.62 to 99.22 percent sequence similarity to the reference sequence of C. gialaiensis, confirming the species’ presence in all three districts. The remaining seven samples, all from Chu Pah, belonged to a different species altogether, underscoring how easily these lookalike geckos can be misidentified without genetic verification. Morphological measurements of captured animals, including snout-vent length, head dimensions, and limb proportions, fell within the ranges reported for the original type specimens.

The confirmed distribution is the study’s most encouraging finding. C. gialaiensis is now known to occur in at least three districts of Gia Lai Province, with the nearest subpopulations separated by 22 kilometers between Chu Se and Duc Co, 41 kilometers between Duc Co and Chu Pah, and 56 kilometers between Chu Pah and Chu Se. These distances suggest the species once ranged more widely across the province before habitat destruction carved its population into isolated fragments. Yet the species went undetected on 16 of the 28 surveyed transects, and its rarity elsewhere indicates that much of the suitable habitat has already been lost, leaving the gecko to persist only in remnant patches of natural vegetation or to survive, apparently by accident, within monoculture plantations.

The population numbers are sobering. Using a capture-mark-recapture approach, in which each gecko was hand-caught, marked with correction fluid dots or numbers, and released at its point of capture, the team applied the Schnabel index to estimate abundance. In Chu Se District, the total population was estimated at approximately 96 individuals, with a 95 percent confidence interval of 40 to 314, of which only 47 were adults. Populations in Duc Co and Chu Pah are even smaller. These figures fall far below established thresholds for long-term viability: classical recommendations and recent simulations suggest an effective population size of roughly 500 individuals for species with moderate reproductive rates, while some analyses argue that at least 7,000 are needed to secure the long-term survival of any vertebrate. With so few animals, C. gialaiensis is acutely vulnerable to environmental and demographic randomness, and the low proportion of juveniles recorded, just under 17 percent, offers little sign of robust recruitment.

The gecko’s ecological preferences help explain its predicament. Individuals were most active between 20:00 and 22:00 and were found on hole cliffs, soil cliffs, tree trunks, shrubs, and coffee stumps at elevations of 557 to 650 meters above sea level. The microhabitats they occupy are cool and humid, with mean air temperatures around 23 degrees Celsius, mean relative humidity above 81 percent, and substrate temperatures averaging about 21.6 degrees. Canopy cover at occupied sites averaged only around 35 to 40 percent, reflecting the open, managed character of the plantations the species now inhabits. These narrow requirements mean that even modest changes in land management, such as the shift from bamboo to coconut palm documented at one site in October 2022, can render habitat unsuitable, while intensified chemical use on converted land adds further pressure.

Threats are everywhere the gecko lives. Habitat loss driven by land-use change was identified as the most critical risk facing every population, compounded by garbage, including plastics and chemical products, littering the habitat in Chu Se. A telling indicator of predation pressure came from tail condition: between roughly 38 and 60 percent of individuals encountered across the four Chu Se transects had regenerated tails, a sign of past attacks, likely by domesticated animals. None of the studied populations lies within a protected area, leaving landowners free to convert plantations at will. Provincial strategies for 2023 to 2025, with a vision toward 2030, recommend replacing traditional crops such as rubber, pepper, coffee, and sugarcane with passion fruit, potato, pineapple, banana, chili, watermelon, and soybean, a transition the study’s authors identify as a major short- and medium-term threat to wildlife survival across the region.

The broader conservation picture is complicated by conflicting assessments. While the IUCN Red List lists the species as Critically Endangered, Vietnam’s national Red Data Book downgraded it to Endangered, citing a larger estimated extent of occurrence. The new study recalculated both metrics using all recorded localities and the GeoCAT tool, arriving at an extent of occurrence of approximately 2,124 square kilometers and an area of occupancy of 56 square kilometers. But because every subpopulation is estimated to contain fewer than 50 mature individuals and is severely fragmented, with continued decline expected, the authors conclude the species meets the criteria for Critically Endangered category C2a(i). The long distances between subpopulations and the absence of habitat corridors make migration essentially impossible, raising the specter of genetic drift and inbreeding depression eroding what little diversity remains.

There is still a narrow path forward, and the study outlines it. At the type locality, a payment for ecosystem services scheme has already been implemented, under which the landowner agreed to forgo chemical products, crop conversion, and other activities harmful to the species. The researchers recommend expanding field surveys to identify sites with better vegetation cover that could be designated as protected areas or species conservation areas, and they call for a captive-breeding program to reinforce the small, fragmented wild populations. Whether these measures arrive in time will determine if the Gia Lai Bent-toed Gecko becomes a cautionary tale of coffee-farm biodiversity lost, or a rare example of a Critically Endangered reptile pulled back from the brink in one of Southeast Asia’s most transformed landscapes.

Subject of Research: Population status, distribution, and conservation of the Critically Endangered Gia Lai Bent-toed Gecko in Vietnam

Article Title: Decades of habitat destruction – is there any chance left for the endemic and Critically Endangered Cyrtodactylus gialaiensis in Vietnam?

Article References: Ngo, H. T., Quang Phan, T., Do, Q. H., Ngo, H. N., Nguyen, H. Q., Luu, V. Q., Pham, C. T., Ngoc Ho, A. T., Nguyen, T. Q., Nguyen, T. H., Ziegler, T., & Le, M. D. (2026). Decades of habitat destruction – is there any chance left for the endemic and Critically Endangered Cyrtodactylus gialaiensis in Vietnam?. Nature Conservation, 61, 113-131. https://doi.org/10.3897/natureconservation.61.169011

Image Credits: AI Generated

DOI: 10.3897/natureconservation.61.169011

Keywords: Cyrtodactylus gialaiensis, Gia Lai Bent-toed Gecko, Vietnam, habitat loss, Critically Endangered, reptile conservation, population estimate, coffee plantations, habitat fragmentation, IUCN Red List, Central Highlands, captive breeding

Yellow camellias hold an almost legendary status among plant collectors and horticulturists. For decades, the only camellias known to science bore flowers in shades of white, pink, and red, and the revelation in the twentieth century that wild populations of golden-flowered camellias existed in the karst landscapes of Guangxi transformed the ornamental horticulture industry and triggered intense conservation attention. Today, botanists estimate that China hosts between 21 and 24 yellow-flowered Camellia species, most of them confined to narrow ranges in Guangxi, with only a handful recorded in Yunnan and Guizhou. Vietnam, by comparison, supports nearly 50 species, and new ones continue to be described regularly. Every yellow camellia in China is currently listed as a Grade-II National Protected Wild Plant, a legal status that reflects both their scientific value and their vulnerability.

The new species came to light through field investigations conducted between 2020 and 2025 in Hekou Yao Autonomous County, Yunnan, with additional material from Miechang town in Maguan County. What immediately set the plant apart was where it grew. Yellow camellias typically occupy elevations from 125 to 1,600 meters, and the highest Chinese record had been Camellia mingii at 1,300 meters. The newly discovered species was found growing at 1,650 meters, in evergreen broad-leaved forests on limestone hills, making it the highest-elevation yellow camellia recorded anywhere. Its companions in these forests include Carya sinensis, Michelia lacei, Phoebe macrocarpa, and Itoa orientalis, a community characteristic of the region’s distinctive karst flora.

Morphologically, Camellia guiliangii is a shrub or small tree reaching two to four meters in height, with leathery elliptic to oblong leaves measuring 11 to 18 centimeters long. Its flowers, three to five centimeters across, bear seven to nine pale yellow petals arranged in three whorls, with numerous stamens about two centimeters long whose outer filaments are fused at the base. Flowering runs from October to January, peaking in November and December, and the fruits ripen from October to November. The species is named in honor of Mr. Guiliang Zhang of the Daweishan National Nature Reserve, one of its discoverers, in recognition of his contributions to investigating and conserving plant diversity in the Daweishan area. Its Chinese name is Guì liáng jīn huā chá.

The closest relative in appearance is Camellia fascicularis, but three decisive characters separate the two. The new species has a connate style, meaning the styles are fused into a column about 1.8 centimeters long that divides into three arms only near the tip, whereas C. fascicularis has distinct, free styles. The fruit of the new species is oblate, or flattened like a sphere squeezed at the poles, rather than globose. And the seeds tell their own story: those of Camellia guiliangii are densely covered with short, yellowish-brown pubescence, while those of C. fascicularis carry long, yellow hairs. Further differences appear in the details, including the ovary shape, which is globose in the new species and ovoid in its relative, and the leaf margin, which bears dense sharp teeth on the distal half of the blade.

To test whether these morphological distinctions reflected genuine evolutionary separation, the research team assembled a phylogenomic dataset of unprecedented depth for the group. They sampled 20 yellow-flowered Camellia species, using Camellia hiepii from section Piquetia as an outgroup. Fresh leaf tissues from 11 species were flash-frozen on dry ice and processed for RNA extraction and transcriptome sequencing, generating at least 6 gigabytes of clean data per sample. For the remaining 10 species, the team resequenced DNA extracted from silica-dried leaves on the BGI DNBSEQ-Tx platform, yielding approximately 60 gigabytes of clean data per sample.

The computational pipeline then went to work. Transcriptomes were assembled de novo with Trinity, redundant transcripts removed with CD-HIT, and coding sequences predicted with TransDecoder. OrthoFinder generated reference sets of single-copy orthologous genes, and after filtering out possible paralogs, the team assembled 881 single-copy nuclear genes using HybPiper. Each gene was aligned with MAFFT and trimmed with Gblocks before maximum likelihood analysis in IQ-TREE with 1,000 ultrafast bootstrap replicates. The result was a phylogenetic tree with most nodes receiving full support, 100 percent bootstrap values, and relationships consistent with previous phylogenomic studies of the group.

The verdict from the molecular data was unambiguous. Camellia guiliangii forms its own distinct clade, not closely related to or nested within any other yellow camellia in the analysis. Combined with the morphological evidence, this confirms the plant as a genuinely new species with a deep evolutionary history of its own, a finding that matters far beyond taxonomy. Each narrowly endemic species like this one represents a unique branch of the camellia family tree, and its loss would erase millions of years of independent evolution.

That risk is very real. The species is provisionally assessed as Critically Endangered under IUCN criteria B1ab(iii) and B2ab(iii), based on a very limited extent of occurrence and area of occupancy combined with continuing decline in habitat quality. Fewer than 100 individuals have been recorded in Miechang town, within only two populations across a very restricted range. Limestone karst forests in southern Yunnan face ongoing pressure from habitat conversion, and species confined to such small patches are exceptionally vulnerable to stochastic events, from landslides to drought, that could eliminate entire populations at once.

The discovery also reshapes what botanists know about the elevational limits of yellow camellias. By pushing the recorded ceiling to 1,650 meters, Camellia guiliangii hints that karst mountains may harbor more undiscovered golden camellias in cooler, higher forests than previously suspected. For conservationists, the message is clear: protecting the limestone forests of Maguan County is now essential to the survival of one of the rarest flowering plants in China, a golden camellia found nowhere else on Earth and known from fewer than 100 living individuals.

Subject of Research: Botany

Article Title: Camellia guiliangii ( Theaceae ), a new yellow-flowered Camellia species from limestone mountains of southern Yunnan, China

Article References: Zhang, R., Qin, Q., Zhang, G., He, D., Zhang, J., Tang, S., & Wei, S. (2026). Camellia guiliangii (Theaceae), a new yellow-flowered Camellia species from limestone mountains of southern Yunnan, China. PhytoKeys, 277, 153-160. https://doi.org/10.3897/phytokeys.277.198822

Image Credits: AI Generated

DOI: 10.3897/phytokeys.277.198822

Keywords: Camellia guiliangii, yellow camellia, new species, Yunnan, limestone karst, phylogenomics, Critically Endangered, Theaceae, plant conservation, China, Camellia, guiliangii

The story began in May 2025, when researchers conducting field surveys in the karst landscapes of central Guangxi encountered a fruiting Ophiorrhiza growing within a cave. Karst terrain, formed by the dissolution of soluble limestone bedrock, produces a mosaic of caves, sinkholes and shaded gorges that harbour many narrow endemics. These habitats act as evolutionary islands, and the team immediately recognised that the plant before them did not match any known species in the region. A follow-up collection in February 2026, when the plants were in flower, allowed a full morphological and genetic characterisation.

Ophiorrhiza is a large and notoriously difficult genus within Rubiaceae, comprising predominantly annual or perennial herbs, with subshrubs appearing only rarely. Species in the genus are most readily recognised by their distinctive fruits: obcordate, flattened capsules that split open along a transverse slit at the apex into two valves. The genus has long been entangled with Spiradiclis, a related group of roughly 60 species concentrated in the subtropical and tropical regions of Southeast Asia, with particular richness in the karst landscapes of southern China and northern Vietnam. The two groups have traditionally been separated by fruit architecture, since Spiradiclis produces linear-oblong or subglobose capsules that dehisce into four valves, in contrast to the two-valved, compressed capsules of Ophiorrhiza.

In 2019, however, Razafimandimbison and Rydin proposed, on the basis of molecular phylogenetic analyses, that Spiradiclis should be treated as a synonym of Ophiorrhiza. Subsequent taxonomic transfers have followed, yet some botanists continue to describe new species under the traditional name Spiradiclis, which generates a steady stream of unnecessary recombination. The authors of the new study adopt the molecularly supported, broader circumscription and therefore describe their discovery under Ophiorrhiza. The tension between molecular evidence and morphologically coherent field concepts remains one of the classic conflicts of modern taxonomy, and the team notes that the boundaries between the two genera still require further investigation.

Morphologically, Ophiorrhiza xinchengensis is a decumbent perennial herb with terete, densely villous stems that do not root at the nodes. Its leaves are elliptic to oblanceolate, 2 to 5 centimetres long and 1 to 1.8 centimetres wide, densely pubescent on both surfaces, with an attenuate base and five to seven pairs of secondary veins. The stipules are linear and only 2 to 3 millimetres long. The white, funnel-form flowers are distylous, a breeding system in which two floral morphs coexist: long-styled flowers bear exserted styles of 12 to 15 millimetres with stamens attached at the middle of the corolla tube, while short-styled flowers carry exserted stamens with filaments adnate at the throat and shorter styles of 5 to 6 millimetres. The corolla tubes measure 10 to 12 millimetres, and the ellipsoid capsules, 2 to 3 millimetres long, are densely pubescent and split into four valves.

These characters separate the new species clearly from its closest look-alikes. It resembles Ophiorrhiza longanensis in its densely pubescent stems, linear stipules and terminal or upper axillary inflorescences, but differs in leaf shape and base, shorter stipules, smaller bracteoles, dramatically longer corolla tubes and the position of filament attachment. Compared with Ophiorrhiza scabrida, the new species has attenuate rather than obtuse leaf bases, much shorter corolla tubes, and a different stamen-style arrangement. Against Spiradiclis hechiensis, which it resembles in its villous stems, terminal inflorescences and corolla colour, the new plant shows linear rather than broad triangular stipules, a straight rather than constricted corolla, a ring of long white hairs inside the tube rather than dense yellow throat villi, glabrous rather than glandular-pubescent corolla lobes, and much longer styles.

To test whether the morphology alone justified species status, the team turned to DNA barcoding of the nuclear internal transcribed spacer, or ITS, region. Total genomic DNA was extracted from silica-dried leaves using a modified CTAB protocol and sequenced by the Sanger method. The researchers generated two new sequences and combined them with 43 additional sequences downloaded from the NCBI database, producing a matrix of 45 taxa. Sequences were aligned with MAFFT, and phylogenetic trees were constructed under both Maximum Likelihood, using IQ-TREE, and Bayesian inference, with substitution models selected automatically under the Bayesian and Akaike information criteria. Nodal support was evaluated with 1000 bootstrap pseudo-replicates.

The phylogenetic results were unambiguous. Ophiorrhiza xinchengensis emerged as an independent terminal branch positioned close to Ophiorrhiza havilandii and Ophiorrhiza hayatana yet clearly separated from them, with strong statistical support of 95 percent bootstrap and a Bayesian posterior probability of 0.97. This exclusive branching pattern indicates an evolutionary trajectory independent of its morphologically similar relatives and firmly supports its recognition as a distinct taxon. Intriguingly, the broader analysis also showed that species of Ophiorrhiza do not form a monophyletic group; they are intermingled with representatives of Keenania, Spiradiclis and Coptophyllum. This finding suggests that, at least based on the ITS marker alone, generic boundaries within the tribe Ophiorrhizeae remain unresolved, and that integrative evidence combining morphology with broader population sampling will be needed to redraw them.

The conservation outlook for the new species is precarious. Field surveys conducted in 2025 and 2026 estimated the single known population at approximately 60 to 100 mature individuals, with an extent of occurrence of roughly 200 square metres and an area of occupancy of about 30 square metres. Under IUCN criterion B, the species is provisionally assessed as Critically Endangered, reflecting its extremely restricted distribution, single location and the potential for habitat degradation. Cave-dwelling plants are particularly vulnerable because their specialised microhabitats cannot be recreated elsewhere, and any disturbance to the cave environment, whether from tourism, quarrying or changing hydrology, could eliminate the entire global population in a single event.

The authors suggest that future studies employing multi-gene phylogenetic analyses and scanning electron microscopy of pollen morphology may help clarify the generic boundaries within Ophiorrhizeae. Until such integrative work is complete, two parallel classification systems are likely to coexist: a phylogenetic one following the expanded circumscription of Ophiorrhiza, and a traditional one maintained by researchers working on regional floras of China and Southeast Asia. As molecular data accumulate for more species, the balance of evidence is expected to favour the monophyletic concept. For now, Ophiorrhiza xinchengensis stands as both a reminder of how much biodiversity remains hidden in the world’s karst caves and a warning that many such discoveries may be documented only just in time to watch them disappear.

Subject of Research: Taxonomic description and phylogenetic placement of a new critically endangered plant species from a karst cave in Guangxi, China

Article Title: Ophiorrhiza xinchengensis ( Rubiaceae ), a new species from Guangxi, China

Article References: Wei, G.-Y., Li, J.-Y., Chen, R., Nong, Y., Hu, Q.-M., Li, Y.-J., Ji, X.-Y., Xu, C.-G., & Nong, Y.-K. (2026). Ophiorrhiza xinchengensis (Rubiaceae), a new species from Guangxi, China. PhytoKeys, 278, 1-14. https://doi.org/10.3897/phytokeys.278.194094

Image Credits: AI Generated

DOI: 10.3897/phytokeys.278.194094

Keywords: Ophiorrhiza xinchengensis, Rubiaceae, new species, Guangxi, karst cave, taxonomy, phylogenetics, ITS barcoding, Critically Endangered, Spiradiclis, China biodiversity, plant conservation

Finless porpoises of the genus Neophocaena have puzzled taxonomists since the first skull was collected in India in 1829. For much of the twentieth century, porpoises across the Indo-Pacific were lumped into a single species, Neophocaena phocaenoides, subdivided into three subspecies. A three-species arrangement was proposed in the 1970s but never gained wide acceptance. In the past two decades, integrative analyses combining morphology and genetics settled on a two-species framework: the Indo-Pacific finless porpoise and the narrow-ridged finless porpoise, with the Yangtze population treated as a subspecies of the latter. The new review systematically synthesises studies from those foundational taxonomic revisions through to the most recent population genomic analyses, and concludes that the evidence now favours a three-species classification in which the Yangtze finless porpoise stands alone.

The geographic distribution of the genus already hints at deep separation. The Indo-Pacific finless porpoise occupies shallow coastal waters of the Indian Ocean, the South China Sea and the East China Sea, while the East Asian finless porpoise inhabits the Yellow Sea, Bohai Sea and coastal waters off Korea and Japan, with an overlap zone in the Taiwan Strait. The Yangtze finless porpoise, by contrast, is the sole obligate freshwater lineage in the genus, confined to roughly 1,800 kilometres of the middle and lower Yangtze River and its interconnected Poyang and Dongting Lake systems. This spatially restricted, ecologically specialised range underscores the distinctiveness of a lineage now regarded as a critically endangered evolutionarily significant unit.

Visible and skeletal differences reinforce the split. Adult East Asian finless porpoises are the largest of the three taxa, reaching about 2.00 metres and a maximum of 2.27 metres, whereas the Yangtze and Indo-Pacific porpoises measure roughly 1.70 metres. Finless porpoises lack a dorsal fin, carrying instead a dorsal ridge and a tuberculated area whose dimensions vary dramatically: the Indo-Pacific porpoise has a broad ridge with a tubercle area 48 to 120 millimetres wide and more than 10 rows of tubercles, while the Yangtze porpoise shows the most reduced condition, with a width of only 2 to 8 millimetres and 1 to 5 rows. Skull metrics tell a similar story. The Indo-Pacific porpoise has a short, broad rostrum, the East Asian porpoise a narrow, slender one, and the Yangtze porpoise an intermediate form with reduced tooth counts, elongated temporal fossae and widened occipital condyles. Discriminant analyses can reliably separate the Yangtze porpoise from its closest marine relative using braincase length, premaxillary width, orbital width and temporal fossa length.

Internal anatomy reveals adaptations to life in fresh water. The Yangtze porpoise has smaller kidney structures across several indices, including relative medullary thickness and area, and correspondingly weaker urine concentrating capacity than its marine counterpart, consistent with the challenge of excreting excess water in a hypotonic environment. Its visual system is also remodeled: shorter distances from eye centre to snout tip, reduced eye slit height, a smaller lens and fewer optic and eye muscle nerves, adaptations to the turbid, dim waters of the Yangtze. Recent ultrastructural studies of the epidermis add another layer, showing that the freshwater porpoise has a lipid-rich outermost skin layer with fewer cell layers and enlarged neutral lipid droplets that curb passive water influx, while the marine porpoise relies on densely packed keratin filaments and reinforced desmosomes to prevent water loss in salt water.

Life history traits diverge as well. Populations in the South China Sea mature earliest, with males breeding at about three years and females at four, and live up to 21 years. Yellow Sea porpoises mature around four years and can reach 24 years. The Yangtze porpoise shows the most protracted development, maturing at roughly five years with a maximum longevity of only 17 years, parameters that are critical for modelling the viability of a population hovering near extinction.

Molecular markers have documented significant genetic structure for decades. Analyses of the mitochondrial DNA control region, microsatellites, nuclear SNPs, MHC genes and AFLP fingerprints revealed very strong overall population structure in Sino-Japanese waters, with fixation indices as high as 0.61. Even where distributions overlap, gene flow between populations is very limited or absent. Crucially, the Yangtze porpoise shares no haplotypes with any marine population, a signature of long-standing reproductive isolation.

Population genomics has delivered the strongest evidence yet. In a landmark study, researchers sequenced one Yangtze porpoise de novo and re-sequenced 48 finless porpoises from Chinese waters, identifying more than 13 million high-confidence SNPs. Phylogenetic reconstruction resolved the Yangtze porpoise as a distinct clade, and population structure analyses, principal component analysis, linkage disequilibrium decay and demographic modelling all confirmed stable divergence. Bayesian species delimitation statistically favoured the three-species model. The wide-ridged and narrow-ridged lineages split about 100,000 years ago, while the Yangtze porpoise diverged from its marine narrow-ridged relatives between 5,000 and 40,000 years ago, a timing consistent with sea-level fluctuations during the Last Glacial Period that likely isolated the freshwater population. Most notably, the Yangtze porpoise carries significant positive selection signals in genes governing osmoregulation and the renin-angiotensin system, including ADCY1, DYNC2H1, SLC14A2 and ACE2, matching the earlier kidney morphology findings. Telomere-to-telomere gap-free genome assemblies confirmed substantial genomic divergence, with positively selected genes in the Yangtze porpoise linked to DNA damage repair and those in the East Asian porpoise tied to high-salinity tolerance.

The taxonomic stakes are profound. Species are the fundamental unit of biodiversity law, and in China elevation to full species status enables listing under the Wildlife Protection Law and the National List of Key Protected Wild Animals, unlocking legally mandated habitat preservation, captive breeding programmes and enforceable prohibitions on disturbance. Internationally, CITES regulates trade species by species and IUCN Red List assessments of independent species carry far greater weight in mobilising global action. The porpoise is already acknowledged as a species in China, where it has become a genuine flagship: the country established a dedicated Yangtze Finless Porpoise Conservation Day in 2019, the first for any single wildlife species, and a new ten-year action plan jointly issued by eight ministries designates it a flagship and umbrella species. Known popularly as the aquatic giant panda and the smiling angel, the porpoise is the sole surviving apex predator in the Yangtze, and its recovery from 1,012 individuals in 2017 to 1,426 in 2025, an increase of more than 40 percent, has become a headline indicator of the river’s health under the Yangtze River Protection Law and the ten-year fishing ban. A mature conservation infrastructure now integrates eight in-situ reserves, four naturalised ex-situ populations with over 150 managed individuals, and successful captive breeding including second-generation offspring, practices formally proposed as a global framework for endangered small cetaceans.

The authors close with a warning drawn from history. The extinction of the baiji, the Yangtze River dolphin, showed that conservation operates within a closing window: once a population collapses, the chance for recovery may vanish entirely. Recognising the Yangtze finless porpoise as a full species would affirm millions of years of unique freshwater evolution and trigger the most robust protections available, ensuring that the porpoise does not follow the baiji’s trajectory. Its umbrella effect means that measures taken on its behalf simultaneously promote the restoration of the entire riverine environment, making its formal recognition a decisive test of whether science-driven taxonomy can still outrun decline.

Subject of Research: Taxonomic review of the Yangtze finless porpoise's species status based on multidisciplinary evidence

Article Title: Evolutionary differentiation and adaptive divergence support the Yangtze finless porpoise as an independent species, a flagship of conservation value: A review

Article References: Lu, Y., Zhou, K., & Yang, G. (2026). Evolutionary differentiation and adaptive divergence support the Yangtze finless porpoise as an independent species, a flagship of conservation value: A review. Nature Conservation, 64, 77-92. https://doi.org/10.3897/natureconservation.64.193600

Image Credits: AI Generated

DOI: 10.3897/natureconservation.64.193600

Keywords: Yangtze finless porpoise, Neophocaena asiaeorientalis, species delimitation, taxonomy, population genomics, osmoregulation, adaptive evolution, freshwater cetacean, conservation policy, critically endangered, Yangtze River, flagship species