Into the deep: A phylogenetic approach to the bivalve. subclass Protobranchia
Into the deep: A phylogenetic approach to the bivalve. subclass Protobranchia
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DOI：
10.1016/j.ympev.2013.05.018
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发表时间：
2013-10-01
影响因子：
4.1
通讯作者：
Giribet, Gonzalo
中科院分区：
文献类型：
--
作者：
Sharma, Prashant P.;Zardus, John D.;Giribet, Gonzalo
原鳃类是双壳类软体动物的一个亚类，与剩下的双壳类是姐妹，它的分子遗传学长期以来一直被证明是难以捉摸的，因为许多组成谱系是深海特有的，这给收集和保存遗传材料带来了方法上的挑战。我们获得了74个代表的所有12个现存的原鳃科，并调查了这组的内部同源性使用5个分子位点（165 rRNA，18 S rRNA，285 rRNA，细胞色素c氧化酶亚基I，组蛋白H3）的序列数据。基于模型和动态同源性简约的方法，系统发育重建一致支持四个主要分支的原鳃类，无论治疗核核糖体基因18 S rRNA和28 S rRNA的高变区。这四个分支对应于总科Nuculoidea（不包括Sareptidae），Nuculanoidea（包括Sareptidae），Solemyoidea和Manzanelloidea。该系统发生学的突出方面包括：（1）支持将Sareptidae科与Nuculanoidea放在一起;（2）Solemyida目（Solemyidae + Nucinellidae）的非单系性;（3）大多数珠心类和珠心类属和科的非单系性。鉴于这第一个家庭水平的原鳃类的生殖，我们提出了一个修订的分类组。与多样化率的分析一致的分歧时间的估计表明，在现存的原鳃类的演化中的二叠纪末大规模灭绝的签名。(C)2013 Elsevier Inc. All rights reserved.
A molecular phylogeny of Protobranchia, the subclass of bivalve mollusks sister to the remaining Bivalvia, has long proven elusive, because many constituent lineages are deep-sea endemics, which creates methodological challenges for collecting and preserving genetic material. We obtained 74 representatives of all 12 extant protobranch families and investigated the internal phylogeny of this group using sequence data from five molecular loci (165 rRNA, 18S rRNA, 285 rRNA, cytochrome c oxidase subunit I, and histone H3). Model-based and dynamic homology parsimony approaches to phylogenetic reconstruction unanimously supported four major clades of Protobranchia, irrespective of treatment of hypervariable regions in the nuclear ribosomal genes 18S rRNA and 28S rRNA. These four clades correspond to the superfamilies Nuculoidea (excluding Sareptidae), Nuculanoidea (including Sareptidae), Solemyoidea, and Manzanelloidea. Salient aspects of the phylogeny include (1) support for the placement of the family Sareptidae with Nuculanoidea; (2) the non-monophyly of the order Solemyida (Solemyidae + Nucinellidae); (3) and the non-monophyly of most nuculoid and nuculanoid genera and families. In light of this first family-level phylogeny of Protobranchia, we present a revised classification of the group. Estimation of divergence times in concert with analyses of diversification rates demonstrate the signature of the end-Permian mass extinction in the phylogeny of extant protobranchs. (C) 2013 Elsevier Inc. All rights reserved.