A new species of Amolops (Anura: Ranidae) from Vietnam

A new species of Amolops is described from northwestern Vietnam based on morphological differences and molecular divergence. Morphologically, Amolops ottorum, new species, is distinguishable from its congeners on the basis of a combination of the following diagnostic characters: size small (SVL 47.5-48.2 nun in females); head longer than wide; vomerine teeth absent; snout short (SE/SVL 0.14-0.15); tympanum dark brown, small (TD/ ED 0.36-0.37 in females); skin smooth; supratympanic fold absent; dorsolateral fold absent; webbing formula I 0-1/3 II 0-1 III 0-1 IV 2-0 V; in life, dorsum green with some dark brown spots; flanks with irregular dark markings; head and body with irregular dorsolateral cream stripe; dorsal surface of fore and hind limbs green with dark crossbars; throat, chest, anterior part of belly light-cream with brown dots; and posterior part of belly cream. In phylogenetic analyses, the new species is weakly supported as a sister taxon of Amolops tuberodepressus, and approximately 5.6% divergent from it based on a fragment of the cytochrome b gene.