Crawling through time: Transition of snails to slugs dating back to the Paleozoic, based on mitochondrial phylogenomics
Crawling through time: Transition of snails to slugs dating back to the Paleozoic, based on mitochondrial phylogenomics
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DOI：
10.1016/j.margen.2010.12.006
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发表时间：
2011-03-01
期刊：
影响因子：
1.9
通讯作者：
Gosliner, Terrence
中科院分区：
文献类型：
--
作者：
Medina, Monica;Lal, Shruti;Gosliner, Terrence
海蛞蝓（腹足纲：后鳃纲）的特点是广泛的形态相似性。特别是，减少或没有壳是整个组的主导地位。这种贝壳流失的趋势导致了化石记录的减少。基于DNA的进化树有助于提高我们对这一群体进化的理解，主要的进化枝正在出现。我们报告了13个新的完整的后鳃线粒体基因组，为这些新兴的节点提供了有力的支持。我们命名三个新的分支内的后鳃，Actopleura（Acteonoidea加上裸肋），Placopleaga（头盾目加上Anaspidea），和Siphoglossa（Sacoglossa加上Siphonaria）。最后，我们使用分子钟测年，表明较早的后鳃分歧比以前报道的。这种进化的情况下的影响进行了讨论。(C)2011 Elsevier B.V.保留所有权利。
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. (C) 2011 Elsevier B.V. All rights reserved.