New toothed toad species found in Yunnan after 36 years

Researchers identified a new toothed toad, Oreolalax wumengmontis, in southwest China’s Yunnan Province after field surveys in the Wumeng Mountain National Nature Reserve. The find is the first new Oreolalax species reported from the province since 1990 and could matter for conservation because the toad is known only from one site.

Why it matters: - The discovery adds a new species to Oreolalax, a genus of mountain-dwelling toothed toads that has been difficult to sort because many species look similar. - The toad is known only from one location in the Wumeng Mountain National Nature Reserve, which raises conservation concerns. - More than half of Oreolalax species are listed as threatened by the International Union for Conservation of Nature because of habitat loss and degradation.

What happened: - Researchers found a new species, Oreolalax wumengmontis, in the Wumeng Mountain National Nature Reserve in Yunnan Province, China. - The field surveys took place in May 2024 at about 2,300 meters above sea level in Zhaotong City, northeastern Yunnan. - The study was published June 23, 2026, in Asian Herpetological Research. - The research team came from Southwest University, Southwest Forestry University and the Management and Conservation Bureau of Yunnan Wumeng Mountain National Nature Reserve. - The paper used molecular phylogenetic analyses and detailed morphological comparisons to identify the species. - The source URL for the paper is the full study.

The details: - Genetic analysis of mitochondrial genes 16S rRNA and COI showed that Oreolalax wumengmontis is a distinct lineage. - The closest known relative is Oreolalax omeimontis. - The species differs from O. omeimontis by genetic distances of 11.25% in 16S rRNA and 17.61% in COI. - Phylogenetic analyses placed the new species as a sister group to O. omeimontis, with 97% bootstrap support and a Bayesian posterior probability of 1.0. - The two species are separated by more than 500 kilometers. - Adult males measure 49.5 to 53.0 millimeters in snout-vent length. - The single female specimen measures 46.6 millimeters. - The species has hidden or only slightly visible tympanums, no vocal sac and only rudimentary webbing between the toes. - A dark triangular patch between the eyes is one of the most distinctive markings. - Male individuals have a dorsum with large and small tubercles, cloudy spotting on the abdomen and large femoral glands. - When the hindlimb is stretched forward, the tibiotarsal articulation reaches the region between the eye and nostril. - The species can be distinguished from all other known congeners by a unique combination of 11 morphological characteristics. - The genus Oreolalax includes 21 described species, and 19 of them occur in southwestern China’s mountainous regions. - No new Oreolalax species had been described from Yunnan since 1990. - The genus typically lives in high-altitude montane stream environments, especially in the Hengduan Mountains and nearby areas. - The new toad lives in subtropical evergreen broadleaved forest and breeds in perennial streams in early May. - Female specimens were observed laying about 144 white eggs under rocks in the streams.

Between the lines: - The finding suggests Yunnan’s toothed toad diversity has been underestimated, even in a national nature reserve. - The authors say the discovery challenges the assumption that the genus is already fully documented in one of China’s most biodiverse provinces. - The results point to a pattern of specialization and local endemism in Oreolalax. - The paper notes that Oreolalax adelphos and Oreolalax sterlingae, documented in northern Vietnam, may also occur along Yunnan’s southern border.

What's next: - Further field surveys and integrative taxonomic studies are needed to better define Oreolalax diversity across southwestern China and adjacent regions. - Conservation planning may need to consider the new species’ limited known range and the broader habitat pressures affecting the genus. - The discovery could lead researchers to recheck other protected areas and border regions for additional undocumented amphibian species.

The bottom line: - A toad hiding in plain sight in a protected mountain reserve shows how much biodiversity may still be undiscovered in southwest China.