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首页> 外文期刊>Marine genomics >Crawling through time: Transition of snails to slugs dating back to the Paleozoic, based on mitochondrial phylogenomics
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Crawling through time: Transition of snails to slugs dating back to the Paleozoic, based on mitochondrial phylogenomics

机译:穿越时间:基于线粒体系统发育组学,蜗牛向可追溯至古生代的过渡

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摘要

Sea slugs (Gastropoda: Opisthobranchia) are characterized by extensive morphological homoplasy. In particular, reduced or absent shells are predominant throughout the group. This trend towards shell loss has resulted in a poor fossil record. DNA-based phylogenies have been helpful in improving our understanding of the evolution of this group and major clades are emerging. We report 13 new complete opisthobranch mitochondrial genomes that provide robust support for some of these emerging nodes. We name three new clades within the Opisthobranchia, the Actopleura (Acteonoidea plus Nudipleura), Placoesophaga (Cephalaspidea plus Anaspidea), and Siphoglossa (Sacoglossa plus the Siphonaria). Finally we use molecular clock dating that suggests an earlier opisthobranch divergence than previously reported. The implications of this evolutionary scenario are discussed.
机译:海参(天麻:Opisthobranchia)的特征是广泛的形态同质性。特别地,在整个组中主要是壳的减少或缺失。这种失去贝壳的趋势导致了不良的化石记录。基于DNA的系统发育有助于改善我们对这一群体进化的认识,并且主要进化枝正在出现。我们报告13个新的完整opisthobranch线粒体基因组,为这些新兴节点中的一些提供强大的支持。我们在视鞭毛虫中命名了三个新分支:Actopleura(Acteonoidea加上Nudipleura),Placoesophaga(Cephalaspidea加上Anaspidea)和Siphoglossa(Sacoglossa加上Siphonaria)。最终,我们使用分子钟测年法,表明与以前报道的相比,更早的花ist分支。讨论了这种进化方案的含义。

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