A new cryptic species of Acanthosaura Gray, 1831 (Squamata: Agamidae) from Thailand and Cambodia

摘要

A new species of Acanthosaura (Gray 1831), A cardamomensis sp. nov. from eastern Thailand and western Cambodia is described based on having a combination of unique morphological characteristics. It most closely resembles A. crucigera but differs in having significantly longer postorbital spines, occipital spines, nuchal spines, and dorsal spines; more scales between the fifth canthals; longer maximum dorsal scale length; longer maximum nuchal scale length; a significantly smaller diastema between thenuchal and dorsal crest spines; and significantly more supralabia'ls. Mitochondrial DNA was used to calculate percent sequence divergence between samples of A. crucigera from southern Myanmar and western Thailand and samples of A. cardamomensis sp. nov.from eastern Thailand and western Cambodia. The uncorrected pairwise sequence divergence between populations of A. cardamomensis ranged from 1.2-3.1% and the range between populations of A. crucigera was 3.8%. The percent sequence divergence between A.cardamomensis sp. nov. and A. crucigera ranged between 10.0-14.6%.