A new species of the genus Boulenophrys (Anura, Megophryidae) from Nanshan National Park, Hunan Province, China

A new species of Asian horned toad, Boulenophrys youran sp. nov., is described from Nanshan National Park in southwestern Hunan Province, China. Phylogenetic analyses based on mitochondrial 16 S rRNA and COI genes place it within the Boulenophrys omeimontis species group as a distinct lineage. The new species can be diagnosed by the following combination of morphological characters: (1) Body size relatively large, SVL 45.3–51.1 mm in nine adult males, 55.6–58.2 mm in two adult females; (2) head wider than long, males HDL / HDW 0.69–0.83; (3) margin of tongue feebly notched posteriorly; (4) subarticular tubercles present on fingers I, relative finger lengths II <I <IV <III; (5) relative toe lengths: I <V <II <III <IV; (6) vomerine ridges present, vomerine teeth absent; (7) hindlimbs slender, heels overlapping when hindlimbs folded; (8) tibiotarsal articulation exceeding snout tip when leg stretched forward; (9) toes with weak webbing, formula: I 1 ⅓ - 2 II 1 ⅓ - 2 ½ III 2 - 3 ½ IV 3 ½ - 2 V, lateral fringes on toes wide; (10) dense moderate black conical nuptial spines on inner two fingers in breeding males.