The rediscovery is remarkable not only for its rarity but also for its geography. The type locality of M. kempi lies in the Garo Hills of northeastern India, while the new specimens were collected more than 1,000 kilometres to the southeast on Baratang and Interview Islands. Geologically, the Andaman–Nicobar archipelago is the emergent crest of a long submarine ridge extending from the Arakan–Yoma ranges of western Myanmar in the north to Sumatra in the south, and it sits roughly 1,200 kilometres from the Indian mainland. Whether the Andaman population is native or the result of transport by human agency remains an open question. Thread-legged assassin bugs are known to have an unusually high spreading potential, and some emesine species are distributed across entire biogeographical regions, yet it is often uncertain whether such ranges are natural or human-caused.

The genus Myiophanes is one of the emesine lineages in which many species are found in caves. Emesinae, the thread-legged subfamily of the assassin bug family Reduviidae, can be recognized by a distinctive suite of characters: an elongate, slender body, forecoxae at least four times as long as wide, fore acetabular openings directed anteriorly, absent ocelli with a single exception, unequal fore tarsal claws armed with comb-like teeth or lamellae, thread-like mid and hind legs, and the absence of the fossula spongiosa on all legs. The genus is currently subdivided into three subgenera and occurs across the Ethiopian, Oriental, Australian and Palearctic regions. The nominotypical subgenus contains ten described species, of which three are known from India. M. kempi is the oldest of these, known for a century only from type material preserved in the Natural History Museum in London.

The specimens were collected by a team surveying cave fauna as part of a conservation project for the edible-nest swiftlet, Aerodramus fuciphagus, in the Andaman Islands. The first male was taken on 13 January 2019 from a cave on Interview Island, the largest wildlife sanctuary in the archipelago, an uninhabited carbonate island harbouring 35 known limestone caves. The second was collected on 16 February 2019 from Baratang Island, which hosts the most significant cave complex on the islands, with more than 175 limestone caves packed into less than one square kilometre of protected reserve forest. Both specimens were preserved in 100 percent ethanol and later examined morphologically at the SACON facility, where they were identified as males of M. kempi using established keys and the original species description.

The habitat details are telling. The Interview Island cave is a horizontal, multi-chambered structure measuring 89.4 metres in length, oriented north-northeast to south-southwest, with two openings and clear zonation. It serves as habitat for both swiftlets and bats, and the specimen was collected from the wall in the dark zone. The Baratang cave is a shorter horizontal passage of 21.1 metres with a single entrance and distinct zones: an entrance zone from one to eight metres, a twilight zone from eight to thirteen metres, and a dark zone from fourteen to twenty-two metres. The bug was found on the right wall surface about fourteen metres from the entrance, at the confluence of the twilight and dark zones, in crevices roughly two metres above the ground, where the substrate is mixed with edible-nest swiftlet guano.

Because the original 1924 description was never accompanied by illustrations, the new study provides the first illustrated account of the species, including the first detailed depictions of the male genitalia. The redescription portrays a medium-sized, elongate, macropterous emesine bug of about 20 millimetres total length, with a pilose body, contrasting colour markings on the pronotum, fore legs and abdomen, and translucent pale-brown forewings with dark-brown veins. The head is elongate and fusiform, almost as long as the anterior lobe of the pronotum, with large globular eyes and a strongly bent labium. The antennae, inserted at the middle of the anteocular region, are much longer than the body, with the first two segments very long and equal in length. The fore legs carry two series of spiniferous processes on the ventral side of the femur, the posteroventral series beginning close to the base with ten long processes, while the fore tarsus is very short, about one-tenth of the tibia, with unequal claws bearing comb-like sub-basal processes.

The male genitalia reveal characters of particular taxonomic significance. The pygophore is cup-like, convex ventrally and not covered dorsally, with a sharp superoposterior spine surrounded by curved, criss-crossing parameres. After potassium hydroxide treatment, a blunt tubercle becomes visible at the base of the long spine, a feature apparently unique among males of the Oriental subgenus and one also observed by a researcher who dissected the pygophore of the syntype male in London. China’s original phrase describing a genital segment with three pale yellow styles strongly curved and almost contiguous at their apices actually refers to the two curved parameres around the median pygophoral spine. The phallus is symmetrical with a stout articulatory apparatus, and the parameres are curved in their distal third, pointed at the apex and armed with long setae in the distal half.

Comparisons with photographs of the syntype and allotype females preserved in London, kindly shared by colleagues, confirmed the identity of the Andaman specimens. The colouration of the head, pronotum, fore legs and forewing venation matches the century-old type material, though the syntypes have faded over years of preservation. Some variation is evident: one male has a blackish abdomen speckled with black ventrally as originally described, while the second shows midventral and lateral black lines similar to the abdominal colouration of the female syntype. The new specimens also appear to have somewhat longer mid and hind legs than the measurements recorded in 1924. Among Oriental species, M. kempi is distinguished by its much longer head and neck, a uniquely shaped pronotum whose anterior lobe is as long as the head, and the absence of the transverse black annuli on the abdomen seen in relatives such as M. zebrina, M. incompta, M. greeni and M. wygodzinskyi.

The rediscovery carries biogeographical weight. A recent survey of Siju Cave in February 2019 failed to recover either M. kempi or the emesine Bagauda cavernicola, both reported from that cave a century ago, making the Andaman population all the more significant. The researchers note that similar specimens resembling P. cavernicola have recently been collected from Andaman caves and are currently under study. The story also echoes that of M. greeni, described from Sri Lanka in 1903 but not recorded from India for over a hundred years until its report from a cave in Satara, Maharashtra, in 2016, a pattern the authors attribute to a lack of surveys and expertise and a general disregard for insects in biodiversity assessments.

Caves are island-like habitats that support distinct ecosystems of highly specialised organisms, and while many studies attribute the presence of assassin bugs inside caves to prey availability, limited ecological information exists for these predators. None of the cave-dwelling Myiophanes show features of true troglobites, such as loss of pigmentation or eyes, and M. kempi itself has been found both within and outside cave environments. The authors argue that systematic surveys to document cave diversity in the Andaman Islands are essential, both to reveal whether other invertebrates from northeastern Indian caves also occur on the islands and to strategize conservation priorities for these fragile karst ecosystems. For now, a slender predator that vanished from scientific view for a hundred years is once again on the record, lurking in the dark zones of tropical limestone caves.

Subject of Research: Rediscovery of the cave-dwelling assassin bug Myiophanes kempi in the Andaman Islands

Article Title: Rediscovery and redescription of thread-legged assassin bug Myiophanes kempi China, 1924 ( Heteroptera , Reduviidae , Emesinae ) from caves in the Andaman Island, India

Article References: Kawalkar, D., Patil, P., Ghate, H. V., & Manchi, S. (2026). Rediscovery and redescription of thread-legged assassin bug Myiophanes kempi China, 1924 (Heteroptera, Reduviidae, Emesinae) from caves in the Andaman Island, India. Subterranean Biology, 55, 77-94. https://doi.org/10.3897/subtbiol.55.181079

Image Credits: AI Generated

DOI: 10.3897/subtbiol.55.181079

Keywords: entomology, cave biology, Reduviidae, Andaman Islands, taxonomy, biogeography, subterranean ecosystems, Rediscovery, redescription, thread-legged, assassin, Myiophanes

The research team, led by Ajit Kumar and Akshatha Soratur of Pondicherry University together with colleagues at Indian and Japanese institutions, focused on five species that dominate local landings: the greasy grouper Cephalopholis sonnerati, Bleeker’s grouper Epinephelus bleekeri, the bullet tuna Auxis rochei, the Indian mackerel Rastrelliger kanagurta and the Japanese threadfin bream Nemipterus japonicus. These species were deliberately chosen to span different ecological worlds, from fast-swimming pelagic planktivores to bottom-dwelling carnivores, so that any differences in metal uptake linked to habitat or diet could be detected. Between September and December 2024, the team collected adult specimens from the Junglighat and Wandoor fish landing centres near Sri Vijaya Puram, the island capital formerly known as Port Blair, purchasing fish already caught by local fishermen rather than sacrificing animals specifically for the study.

In the laboratory, the researchers dissected each fish under stringent contamination-control conditions, using acid-washed stainless-steel instruments and laminar flow hoods to avoid introducing stray contamination. They sampled four tissues: gills, liver, intestine and dorsal muscle. Roughly one gram of each tissue was digested in closed Teflon vessels with concentrated nitric and perchloric acids in a microwave digestion system, and the resulting solutions were analyzed by inductively coupled plasma mass spectrometry. Quality control was rigorous: certified fish protein reference material, procedural blanks and triplicate analyses produced recoveries between 93 and 105 percent with analytical precision better than five percent. Of the eleven elements targeted, eight, aluminium, cadmium, copper, iron, manganese, nickel, lead and zinc, were consistently quantified, while chromium, cobalt and mercury fell below detection limits in every tissue examined, a striking absence for a region where mercury biomagnification is often assumed to be a concern.

The most striking finding was how strongly metal accumulation depended on organ identity rather than on which species the fish belonged to. The liver emerged as the body’s primary metal reservoir, sequestering copper, iron and especially cadmium at concentrations one to two orders of magnitude above those found in muscle. Cadmium’s affinity for metallothionein proteins and the liver’s central role in detoxification explain this pattern, and the elevated hepatic cadmium burdens in predatory groupers likely reflect cumulative lifetime dietary exposure through cadmium-rich crustacean prey rather than any recent contamination event. Gills told a different story: they preferentially accumulated manganese and aluminium, elements that adsorb onto suspended particles and settle on gill surfaces, making them sensitive real-time indicators of waterborne exposure. Muscle tissue, protected by physiological barriers, consistently showed the lowest concentrations of nearly every metal measured.

Statistical analyses reinforced this tissue-dominated picture. Kruskal-Wallis tests on the pooled dataset of sixty samples found highly significant organ-level differences for six of the eight metals, and multivariate techniques made the pattern unmistakable. Principal component analysis and non-metric multidimensional scaling both separated samples cleanly by tissue type, with liver samples clustering in one region of the ordination space and gill samples in another, confirmed by PERMANOVA with an effect size explaining 46 percent of the variance. When the same ordinations were color-coded by species, no coherent clusters appeared. The overall abundance hierarchy across all samples ran iron greater than zinc greater than aluminium greater than copper greater than manganese greater than lead greater than cadmium greater than nickel, a signature the authors interpret as strong metabolic regulation of essential elements combined with lithogenic inputs from the islands’ lateritic and ultramafic geology.

That geological signature matters for interpreting the contamination profile. The Andaman-Nicobar ridge is built from iron- and aluminium-rich formations, and intense monsoonal weathering naturally flushes these elements into coastal waters, where sediment resuspension during storms drives particulate metal fluxes. The Bay of Bengal also acts as a regional sink for atmospheric pollutants carried from South and Southeast Asia, including metal-bearing aerosols from coal combustion. Against this natural backdrop, the consistent detection of cadmium and lead across all species signals a measurable but low-level anthropogenic influence, likely diffuse inputs from maritime transport, antifouling coatings, harbour activity and long-range atmospheric deposition rather than any single point source. Muscle lead concentrations were comparable to those reported from moderately urbanized Indian coasts such as Visakhapatnam, yet far below levels documented in heavily industrialized systems like Thane Creek near Mumbai.

The human health risk assessment produced a genuinely paradoxical result. Based on muscle tissue concentrations, a conservative regional fish consumption rate of 24 grams per day and a 70-kilogram adult body weight, the estimated daily intakes of all eight metals fell well below FAO/WHO provisional tolerable daily intake thresholds and USEPA reference doses. Target hazard quotients for every metal in every species remained below 1.0, and the cumulative hazard index peaked at just 0.425 in the Indian mackerel, indicating no appreciable non-carcinogenic risk for average consumers. By conventional toxicological standards, Andaman fish are safe to eat.

Yet when the team calculated lifetime cancer risk for cadmium and lead, the only two metals analyzed with established oral carcinogenic potency slope factors, the picture changed. Total carcinogenic risk values exceeded the USEPA benchmark of one excess cancer case per 10,000 individuals in all five species, ranging from 1.28 times ten to the minus three in the bullet tuna to 2.77 times ten to the minus three in the greasy grouper, roughly 13 to 28 times the acceptable limit. The authors are careful to contextualize this: the carcinogenic model assumes linear, no-threshold dose-response relationships and continuous lifetime exposure, deliberately precautionary assumptions that tend to inflate risk estimates at low concentrations. The exceedance does not imply imminent harm, but it does flag a genuine long-term concern for high-frequency consumers, particularly subsistence fishing communities that may eat 100 to 300 grams of fish daily, several times the global average, and for those who favor long-lived, high-trophic predators like groupers, which accumulate more cadmium through trophic transfer.

The study’s broader message is methodological as much as environmental. Reliance on muscle tissue alone, the standard practice in most seafood safety monitoring, would have missed nearly all of the signal documented here, since muscle is precisely the compartment where fish physiology keeps metal concentrations lowest. The liver, by contrast, integrates chronic exposure over an animal’s lifetime, while gills track immediate waterborne conditions, and together these non-edible tissues offer the ecological resolution needed to distinguish natural geochemical background from emerging anthropogenic contamination. The authors recommend a multi-tissue monitoring framework for the Andaman Islands, complemented by otolith microchemistry, which can archive a fish’s metal exposure history in chronological layers, and by paired sediment and water chemistry to strengthen source attribution.

As tourism, inter-island shipping and coastal development accelerate around Sri Vijaya Puram, the transitional contamination profile documented in this study may represent a baseline captured just in time. The absence of mercury, chromium and cobalt in all tissues suggests the region still benefits from limited point sources and efficient open-ocean flushing, but the same open access that keeps the archipelago clean today makes it vulnerable tomorrow. For the coastal communities whose diets depend on these waters, the findings argue for nuanced risk communication that distinguishes acute toxicity from probabilistic lifetime cancer risk, and for consumption advisories tailored to species, trophic position and local eating habits rather than generic safety thresholds. The Andaman fish on the dinner plate remain, by most measures, safe. The fish livers, however, are quietly keeping score.

Subject of Research: Organ-specific trace metal bioaccumulation in commercial marine finfish from the South Andaman Islands and associated human health risks

Article Title: Organ-specific bioaccumulation of trace elements in commercial marine finfish from the South Andaman Islands and associated human health risk assessment

Article References: Kumar, A., Soratur, A., Kumar, S., Sarkar, A., Krishna, S. S. S., Kiruba-Sankar, R., Jha, D. K., & Venmathi Maran, B. A. (2026). Organ-specific bioaccumulation of trace elements in commercial marine finfish from the South Andaman Islands and associated human health risk assessment. Discover Oceans, 3(1), Article 35. https://doi.org/10.1007/s44289-026-00150-4

Image Credits: AI Generated

DOI: 10.1007/s44289-026-00150-4

Keywords: trace metals, bioaccumulation, marine finfish, Andaman Islands, cadmium, lead, liver, gills, food safety, health risk assessment, Bay of Bengal, seafood contamination

The scale of the effort was itself remarkable. India’s reefs are dispersed across vastly different oceanographic settings: the coral atolls of Lakshadweep in the Arabian Sea, the fringing and patch reefs of the Gulf of Mannar, Palk Bay and Goa on the mainland, and the islands of the Maldives-adjacent Andaman archipelago in the Bay of Bengal, including the Mahatma Gandhi Marine National Park (MGMNP). Data on mass bleaching impacts across South Asia have historically been sparse, leaving the region largely invisible in global assessments. By mobilizing a network of scientists, dive operators and trained citizen observers, the research team assembled standardized observations of bleaching and mortality across most of the subcontinent’s major reef areas during a single, globally significant thermal anomaly. The result is a rare, region-wide snapshot of how a mass bleaching event unfolds across an entire nation’s reef estate.

The study’s central metric was degree heating weeks, or DHW, the standard satellite-derived measure of accumulated heat stress that underpins global bleaching forecasting systems such as NOAA’s Coral Reef Watch. As expected, bleaching intensity generally increased with accumulated heat stress. But the strength of that relationship varied dramatically from region to region, exposing the limits of DHW as a universal predictor of reef damage. Two reefs exposed to similar thermal loads could emerge with profoundly different outcomes, a finding that echoes a growing body of evidence that global forecast models need regional and temporal calibration if they are to serve as reliable early-warning tools for reef managers.

Nowhere was this regional variability starker than in the contrast between Lakshadweep and the Mahatma Gandhi Marine National Park. Lakshadweep emerged as the hardest-hit region in the country, with up to 37 percent of coral cover bleached or dead even at intermediate levels of heat stress. The oceanic atolls, which sit in the open Arabian Sea with little local protection from sustained warming, appear to have offered their corals no thermal escape. In sharp contrast, MGMNP in the Andaman Islands recorded only 11.5 percent bleaching or mortality, despite experiencing significant heat stress. The authors attribute this striking difference to regional oceanographic processes capable of creating mesoscale thermal refugia, localized zones where currents, internal waves or other physical mechanisms buffer reefs from the worst of the heat. Previous work in the Andaman Sea has shown that large-amplitude internal waves can deliver pulses of cooler water to reef surfaces during thermal stress, and the new findings lend further weight to the idea that such hidden refugia may be decisive in determining which reefs survive the coming decades.

The taxonomic story proved equally compelling. Across all regions, the branching and plating genera Acropora, Pocillopora, Galaxea and Montipora emerged as the most affected, consistent with the canonical hierarchy of bleaching susceptibility established in reefs worldwide. These fast-growing, structurally complex corals are the architectural engineers of Indo-Pacific reefs, and their disproportionate losses carry cascading consequences for fish habitat, carbonate production and reef growth. At the other end of the spectrum, the massive and encrusting genera Pavona, Platygyra, Goniastrea and Favites were among the least affected, their thick tissues and stress-tolerant symbionts once again proving their worth under thermal duress. For reef managers, this hierarchy has long served as a rough rule of thumb for anticipating post-bleaching community composition.

But Palk Bay broke the rule in spectacular fashion. In this shallow, turbid bay on India’s southeastern coast, the study documented a near-complete reversal of canonical genus-level susceptibilities. The ordinarily vulnerable Acropora colonies showed only modest bleaching or mortality, at 13.6 percent, while the ordinarily resistant Porites colonies suffered a staggering 61.8 percent mortality. Such a reversal is rare and scientifically provocative. It suggests that local conditions in Palk Bay, possibly including prior exposure to recurrent heat stress, the presence of thermally tolerant Symbiodiniaceae symbionts such as Durusdinium, or the moderating effects of turbidity, have reshaped the thermal tolerances of its coral communities in ways that global generalizations cannot capture. It also serves as a cautionary tale: resistance traits are context-specific, and a genus that survives in one reef region may collapse in another.

The mechanistic implications reach deep into coral biology. Bleaching occurs when heat-stressed corals expel or lose the photosynthetic symbiotic algae living in their tissues, starving the coral animal of its primary energy source. Whether a coral bleaches, recovers or dies depends on an interplay of factors: the symbiont types it hosts, its history of thermal exposure, the energy reserves it carries into the event, and the physical environment surrounding it. High-frequency temperature variability, for instance, is known to reduce bleaching risk by priming coral physiological responses, while chronic local stressors can erode resilience. The Indian study’s regional contrasts, Lakshadweep’s open-ocean exposure versus MGMNP’s wave-buffered refugia, Palk Bay’s turbid, heat-conditioned waters versus the clearer reefs of the Gulf of Mannar, provide a natural experiment in how these mechanisms play out at landscape scale.

The findings arrive at a sobering moment. The fourth global bleaching event has confirmed what many reef scientists feared: that warming-driven bleaching is no longer episodic but is ushering in an era of near-annual thermal stress, with global warming tripling the persistence of marine heatwaves and intensifying them by roughly a degree Celsius. For India, the stakes are concrete. Lakshadweep’s atolls support island communities whose shorelines depend on reef-derived sediment, and studies have warned that most atolls may become increasingly uninhabitable by mid-century as sea-level rise exacerbates wave-driven flooding. The loss of up to 37 percent of coral cover in a single event, at only intermediate heat stress, signals that these reefs may have less thermal headroom than their Maldivian and Chagos neighbors, and that recovery between now and the next event is far from guaranteed.

Yet the study is not simply a eulogy. The survival of MGMNP’s reefs, the unexpected toughness of Palk Bay’s Acropora, and the resilience of massive genera across the country collectively point to genuine, mappable refugia and resistance hotspots that could anchor conservation planning. The authors argue that local oceanography and context-specific resistance patterns must be integrated into national and global assessments of bleaching impacts, rather than relying on heat-stress metrics alone. Protecting the oceanographic processes that cool reefs, identifying and safeguarding thermal refugia, and monitoring the survivors of this event as seed populations for recovery are strategies that emerge directly from the data. The study’s underlying dataset has been made openly available through Zenodo, an act of transparency that should accelerate comparative analyses across the wider Indo-Pacific.

As the ocean continues to warm, the fate of India’s reefs will depend on how quickly science can move from global averages to local realities. This nationwide collaboration has shown that the answers lie not in a single number on a satellite map, but in the interplay of currents, waves, symbionts and history that makes every reef region unique. In the ruins of Palk Bay’s Porites and the survivors of the Andaman Sea, Indian reef science has found both a warning and a roadmap.

Subject of Research: Regional and genus-specific coral bleaching responses across India's reef regions during the fourth global coral bleaching event

Article Title: Regional and genus-specific factors underpin bleaching variation across India’s corals reefs during the fourth global coral bleaching event

Article References: Pinto, W., Deshpande, K., Lobo, A. S., Jamalabad, A., Hussain, A., Paul, A., Dutta, A., Arjunwadkar, C., Patel, F. D., Thareja, H., Nangia, I., Josh, J., Goenka, K., Manikandan, B., Namboothri, N., Kuwalekar, P., Nambiar, S., Jaishankar, S., Mahesh, S., … Arthur, R. (2026). Regional and genus-specific factors underpin bleaching variation across India’s corals reefs during the fourth global coral bleaching event. Coral Reefs. https://doi.org/10.1007/s00338-026-02919-7

Image Credits: AI Generated

DOI: 10.1007/s00338-026-02919-7

Keywords: coral bleaching, fourth global bleaching event, degree heating weeks, Lakshadweep, Andaman Islands, thermal refugia, Acropora, Porites, Palk Bay, thermal stress, Indian Ocean reefs, bleaching susceptibility