Four Tiny New Ant Species Emerge from China’s Shennongjia Forests

Deep in the mist-shrouded forests of Shennongjia National Park in China’s Hubei Province, four ant species have slipped past science unnoticed until now. Barely three millimeters long and astonishingly rare, the four new species of the ant genus Temnothorax were discovered during a 26-day survey conducted in 2023 as part of the park’s Background Resources Survey Project. Their formal description, published in the journal ZooKeys, raises the number of Temnothorax species recorded in China from 62 to 66 and delivers something arguably even more valuable: the first complete taxonomic framework for identifying the entire Chinese fauna of this notoriously difficult genus.

Temnothorax is no obscure corner of the ant family tree. Established by the Austrian entomologist Gustav Mayr in 1861, the genus has had a turbulent taxonomic history, bouncing in and out of the related genus Leptothorax for more than a century before molecular phylogenetic studies by Ward and colleagues in 2015 and Prebus in 2017 confirmed its status as a valid, evolutionarily distinct lineage. Today, 505 species and 29 subspecies are recognized worldwide, distributed across the Palearctic, Oriental, Afrotropical, Nearctic, and Neotropical regions. Yet while European, North African, and North American faunas have been extensively catalogued, China’s Temnothorax remained remarkably underexplored, a gap the new study sets out to close.

The four newcomers are Temnothorax shennongi, T. hubeiensis, T. zhaojunae, and T. wangweii, each described from worker specimens collected in the park’s semi-evergreen broadleaf and conifer-broadleaf mixed forests at elevations ranging from 550 to 1,700 meters. What makes their discovery striking is how scarce they are. Among the 3,537 individual ants collected during the survey, representing four subfamilies, 26 genera, and 68 species, only nine individuals belonged to the four new species. T. hubeiensis accounted for four of those, T. shennongi and T. zhaojunae for two each, and T. wangweii for a single worker. The holotype of T. wangweii is, for now, the only known representative of its species on Earth.

Such extreme rarity is not a quirk of this survey but appears to be a defining trait of the genus. Drawing on three decades of ant community surveys across western China, the authors report that Temnothorax species tend to be small-bodied and live in small populations, making them inconspicuous and rarely captured. Across their collections, only a handful of species were common while the majority were rare. This biological elusiveness, combined with limited funding for taxonomic research and the practical impossibility of repeatedly resurveying China’s vast territory, means that describing species from few specimens has become an unavoidable strategy for documenting the country’s ant diversity before it is altered by rapid environmental change.

Shennongjia itself makes a fitting stage for such discoveries. Located in the border mountains where Hunan, Guizhou, Sichuan, and Hubei meet, the park is one of China’s eleven key terrestrial biodiversity conservation regions. It also sits in the heart of central China, ringed by dense human populations and exposed to anthropogenic disturbance, a combination that raises the stakes for documenting what lives there. One of the new species, T. shennongi, is named after Shennong, the legendary Emperor Yan and Chinese god of agriculture and medicine from whom the park takes its name, while T. zhaojunae honors Wang Zhaojun, one of the four great beauties of ancient China, whose hometown lies in Hubei.

The descriptions rest on meticulous morphology rather than DNA barcoding. Workers were examined under a stereo microscope fitted with a micrometer, and high-resolution digital images were produced using a super-resolution imaging system with focus stacking performed in Zerene Stacker software. Every measurement follows established ant taxonomic conventions: total length, head length and width, scape length, eye diameter, pronotal width, Weber’s length of the mesosoma, and petiole dimensions, from which standard indices such as the cephalic index and scape index are calculated. The new species were compared against type and non-type specimen images hosted on AntWeb and AntWiki, and where images were unavailable, the authors turned to original descriptions and line drawings from earlier revisions.

The real methodological contribution lies in how the study organizes the whole genus for China. All 66 known Chinese Temnothorax species are compiled in a checklist and sorted into 20 species groups, each defined by a diagnostic combination of characters, together with a revised identification key for the worker caste. These groups are separated by traits such as antennal segment count, the shape of the pronotum’s humeral corners, the presence or absence of the metanotal groove, the form of the propodeal spines, whether the petiole bears an anterior peduncle, and the shape and sculpture of the petiolar node. The key also corrects an error in the earlier key of Qian and Xu from 2024, in which T. taivanensis had been misplaced because the metanotal groove was misinterpreted.

Each new species is anchored by clear differences from its closest relatives. T. shennongi, placed in the liqiu group, is distinguished from T. liqiu by its strongly convex promesonotum, longer propodeal spines, and coarsely rugose head and mesosoma. T. wangweii, a member of the lichun group with a wholly black body, differs from T. lichun in its narrowly notched metanotal groove and shorter anterior peduncle. T. hubeiensis, in the eburneipes group, stands apart from T. eburneipes by a head dorsum that is rugose over its entire length rather than smooth along the central strip, and by weakly down-curved rather than up-curved propodeal spines. T. zhaojunae, in the kuixing group, is separated from T. leigong and T. kuixing by its smooth head sculpture between rugae, scapes that merely reach the posterior head corners, and a symmetrical triangular petiolar node with a right-angled summit.

Type specimens are deposited in the Ant Collection of Southwest Forestry University in Kunming, Yunnan Province, with one paratype worker of T. hubeiensis earmarked for donation to the Insect Collection at Guangxi Normal University in Guilin. Specimen identities are recorded through unique specimen identifiers and a cataloging format that encodes the collector, the year of collection, and the specimen sequence, an approach designed to make the material traceable and the descriptions repeatable for future researchers. Queens and males remain unknown for all four species, a common situation in ant taxonomy that underscores how much basic biology is still waiting to be observed.

Beyond the four new species themselves, the study illustrates a broader pattern emerging from Chinese ant research: the country’s Temnothorax diversity is far richer than once assumed, and it keeps revealing itself in batches. Hamer and colleagues described two new species from Hong Kong in 2023, and Qian and Xu added 28 new species from across China in 2024. With the Chinese fauna now systematized into species groups and a working identification key spanning all 66 species, the next generation of surveys, whether in Shennongjia or in other underexplored mountains of central and western China, has a far better toolkit for recognizing what they find. Given how few individuals of these forest-floor miniatures it takes to constitute a new species, many more may still be hiding under the leaf litter.

Subject of Research: Taxonomy and identification of Chinese Temnothorax ants, including four new species from Shennongjia National Park

Article Title: Species groups and identification key to Chinese Temnothorax ants ( Hymenoptera , Formicidae ) with descriptions of four new species from Shennongjia National Park

Article References: Deng, F., Yang, J., & Xu, Z. (2026). Species groups and identification key to Chinese Temnothorax ants (Hymenoptera, Formicidae) with descriptions of four new species from Shennongjia National Park. ZooKeys, 1292, 293-325. https://doi.org/10.3897/zookeys.1292.180703

Image Credits: AI Generated

DOI: 10.3897/zookeys.1292.180703

Keywords: Temnothorax, ants, taxonomy, Shennongjia National Park, new species, China, Formicidae, species groups, identification key, biodiversity, Hubei, ZooKeys