Department of Biology, Villanova University, Villanova, PA 19085, USA.
Mol Phylogenet Evol. 2010 Oct;57(1):343-52. doi: 10.1016/j.ympev.2010.06.014. Epub 2010 Jul 1.
Hemidactylus geckos are a species-rich component of many tropical lizard assemblages. We sampled deeply among tropical Asian, and especially South Asian, taxa and used a multi-gene approach to establish the affinities of Indian and Sri Lankan Hemidactylus and to evaluate the monophyly of previously proposed taxa within the genus. There is only weak support for the monophyly of tropical Asian Hemidactylus as a whole, but two strongly supported subclades were retrieved: the bowringii group is a predominantly East Asian clade that reaches South Asia only peripherally; the brookii group is a morphologically diverse clade that represents a previously unrecognized, species-rich (25 species), chiefly South Asian radiation. Deep genetic divergences support the specific recognition of three Sri Lankan taxa previously regarded as subspecies of mainland forms and validate H. subtriedrus as a species distinct from H. triedrus. Unlike several other vertebrate groups, Sri Lankan Hemidactylus do not represent a single insular radiation. Rather, each of six Sri Lankan species reached the island independently from different continental sources. There have been extensive Quaternary land connections between India and Sri Lanka but sister-species pairs of Hemidactylus on the two land masses diverged from one another much earlier, probably in the mid-Miocene.
壁虎是许多热带蜥蜴组合的一个物种丰富的组成部分。我们在热带亚洲，特别是南亚的分类群中进行了深入采样，并使用多基因方法来确定印度和斯里兰卡壁虎的亲缘关系，并评估属内以前提出的分类群的单系性。整个热带亚洲壁虎的单系性只有微弱的支持，但有两个强烈支持的亚群被发现：bowringii 组是一个主要分布在东亚的分支，仅在边缘地区到达南亚；brookii 组是一个形态多样的分支，代表了一个以前未被认识到的、物种丰富（25 种）的、主要分布在南亚的辐射。深层遗传分歧支持以前被认为是大陆形式亚种的三个斯里兰卡分类群的特异性识别，并验证了 H. subtriedrus 是一种与 H. triedrus 不同的独特物种。与其他几个脊椎动物群不同，斯里兰卡壁虎不是单一的岛屿辐射。相反，六个斯里兰卡物种中的每一个都从不同的大陆来源独立到达岛屿。印度和斯里兰卡之间有广泛的第四纪陆地联系，但两个大陆上的壁虎姐妹种早在中中新世就已经彼此分化。
