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Issue: Vol. 5514 No. 6: 2 Oct. 2024
Type: Article
Published: 2024-10-02
DOI: 10.11646/zootaxa.5514.6.1
Page range: 501-524
Abstract views: 1316
PDF downloaded: 27

A new Oreolalax (Anura: Megophryidae) from the Hoang Lien Range, northwest Vietnam

Asian Turtle Program of Indo-Myanmar Conservation; R.1301; CT1 Bac Ha C14 Building; To Huu Str.; Nam Tu Liem Dist.; Hanoi; Vietnam
Zoological Society of London; Regent’s Park; London; NW1 4RY; UK
Zoological Society of London; Regent’s Park; London; NW1 4RY; UK
Asian Turtle Program of Indo-Myanmar Conservation; R.1301; CT1 Bac Ha C14 Building; To Huu Str.; Nam Tu Liem Dist.; Hanoi; Vietnam
Chengdu Institute of Biology; Chinese Academy of Sciences; Chengdu; Sichuan 610213; China
Australian Museum Research Institute; Australian Museum; 1 William St; Sydney; NSW; 2010; Australia; Centre for Ecosystem Science; School of Biological; Earth and Environmental Sciences; University of New South Wales; Sydney NSW 2052; Australia
Amphibian China Leptobrachiinae Po Ma Lung taxonomy

Abstract

The megophryid genus Oreolalax is comprised of 19 species, most of which are endemic to China. A single species, Oreolalax sterlingae, is the only member of the genus known from Vietnam. During fieldwork on Mount Po Ma Lung in the Hoang Lien Range of northwest Vietnam, we encountered individuals of both Oreolalax sterlingae and another, morphologically divergent species of Oreolalax. Analyses of morphological and molecular data reveal that these individuals represent a previously undescribed species of Oreolalax which we describe as new to science. The new species, Oreolalax adelphos sp. nov., is sister to Oreolalax xiangchengensis and can be diagnosed from all other congeneric species by the combination of the following characters: (1) SVL of adult male 38.0 mm, N=1; adult female 46.2 mm, N=1; (2) narrow supratympanic fold; (3) no visible tympanum; (4) head longer than wide; (5) vocal sac absent; (6) absence of subarticular tubercles on hands; (7) basal interdigital webbing on hind feet; (8) ventral surface mottled with grey and creamy white; (9) dorsal surface of head and body covered in rounded, evenly spaced and similar sized tubercles; (10) presence of dark bars on limbs; (11) greyish white and creamy white spots on the flanks, and (12) a bicoloured iris. Oreolalax adelphos sp. nov. is only known from a single site of high elevation bamboo forest, where it is sympatric with Oreolalax sterlingae. Both Oreolalax adelphos sp. nov. and O. sterlingae are almost certain to occur in neighbouring Jinping County in Yunnan Province, China. The new species of Oreolalax likely qualifies for being assessed as Data Deficient in accordance with the IUCN Red List of Threatened Species categories and criteria.

 

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