A new species of Mantidactylus from the East Coast of Madagascar and its molecular phylogenetic relationships within the subgenus Guibemantis
A new species of Mantidactylus from the East Coast of Madagascar and its molecular phylogenetic relationships within the subgenus Guibemantis
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马达加斯加东海岸的螳螂新种及其在 Guibemantis 亚属内的分子系统发育关系
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发表时间：
2005
期刊：
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通讯作者：
F. Glaw
中科院分区：
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作者：
M. Vences;F. Glaw
本文描述了一种新的树栖蛙属Mantidactylus，产于马达加斯加东海岸的低海拔地区。短尾螳螂，新种迄今被认为是Mantidactylus tornieri，但一些特征，区分这一物种的典型种群从中海拔地区已经被检测到。该新种与M. tornieri和Guibemantis亚属的所有相关种的相对手长较短。此外，它有较短的后肢，较小的鼓膜直径和-至少在某些种群-绿色的卵色素沉着（相对于棕色或白色）。M的发音Timidus是不规则的和非结构化的爆炸声和呻吟声，但是可用的录音可能不代表真实的广告呼叫。基于线粒体16 S rRNA基因539个核苷酸分析的分子系统发育将该新物种置于包含M. tornieri，M. depressiceps和M. kathrinae。这些相关物种的遗传分化很大，在所有情况下，未校正的成对分歧超过8%。我们讨论了最近越来越多地使用线粒体遗传标记来得出分类结论，并建议线粒体分化不应该被用作描述新的两栖动物类群的唯一特征。相反，在每一种情况下，都需要仔细评估种群的系统发育位置以及形态、生态和行为方面的论点，以了解一个种群是否值得作为一个单独的物种。
We describe a new species of arboreal frog of the genus Mantidactylus from low altitude sites on the eastern coast of Madagascar. Mantidactylus timidus sp. n. has hitherto been considered as Mantidactylus tornieri, but some of the characters that distinguish it from typical populations of this species from mid-altitude localities had already been detected. The new species mainly differs from M. tornieri and all related species in the subgenus Guibemantis by a shorter relative hand length. Furthermore, it has shorter hind limbs, a smaller tympanum diameter and – at least in some populations – green egg pigmentation (as opposed to brown or white). Vocalizations of M. timidus were irregular and unstructured blasts and moans but the available recordings may not represent the real advertisement calls. A molecular phylogeny based on analysis of 539 nucleotides of the mitochondrial 16S rRNA gene placed the new species sister to a clade containing M. tornieri, M. depressiceps and M. kathrinae. Genetic differentiation from these related species was large, with uncorrected pairwise divergences of more than 8% in all cases. We discuss the recently increasing use of mitochondrial genetic markers to draw taxonomic conclusions and suggest that mitochondrial differentiation should not be used as an exclusive character to describe new amphibian taxa. Instead, phylogenetic placement of populations and morphological, ecological and behavioural arguments need to be carefully evaluated in each case to understand whether a population merits the status of a separate species.