Phylogeny of sharks of the family Triakidae (Carcharhiniformes) and its implications for the evolution of carcharhiniform placental viviparity
Phylogeny of sharks of the family Triakidae (Carcharhiniformes) and its implications for the evolution of carcharhiniform placental viviparity
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DOI：
10.1016/j.ympev.2006.02.011
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发表时间：
2006-07-01
影响因子：
4.1
通讯作者：
Naylor, Gavin J. P.
中科院分区：
文献类型：
--
作者：
Lopez, J. Andres;Ryburn, Julie A.;Naylor, Gavin J. P.
我们提出了一项研究carcharhiniform鲨鱼家庭Triakidae旨在测试现有的假设，这组的关系，并在提高理解的进化生殖特征的板鳃类的家庭间和家庭内的关系。我们的分析和结论是基于四个蛋白质编码基因（三个来自线粒体基因组和一个单拷贝核基因）的DNA序列的证据，从8的9个属和20的39种目前分配到Triakidae。序列数据为以下之前提出的三角亚纲分支提供了强有力的支持：Galeorhinini（Hypogaleus + Galeorhinus）;兔亚科的一个子集（Furgaleus + Hemitriakis，但不是Iago）;以及三角亚纲的一部分（Mustelus、Scylliogaleus和三角亚纲的一部分）。有趣的是，分子数据提供了相当多的证据，并系属Triakis和Mustelus。我们的研究结果表明，Triakis和Cazon的Triakis亚属代表两个不同的谱系，只是远亲，目前定义的属Mustelus不构成一个单系组合，除非S。quecketti和一些Triakis（Cazon亚属）的物种被包括在Mustelus中。在我们的样本中的物种的Mustelus（包括Cazon和Scylliogaleus），序列数据支持两个明确定义的分支，可以通过繁殖模式（胎盘与胎盘物种）进行诊断。本文提出的系统发育框架用于推断真鲨形鲨鱼胎盘胎生进化和丧失中的关键事件。(c)2006年爱思唯尔公司All rights reserved.
We present a study of inter- and intra-familial relationships of the carcharhiniform shark family Triakidae aimed at testing existing hypotheses of relationships for this group and at improving understanding of the evolution of reproductive traits in elasmobranchs. Our analyses and conclusions are based on evidence from DNA sequences of four protein-coding genes (three from the mitochondrial genome land a single copy nuclear gene) from eight of the nine genera and 20 of the 39 species currently assigned to the Triakidae. The sequence data offer strong support for the following previously proposed triakid clades: Galeorhinini (Hypogaleus + Galeorhinus); a subset of the lagini (Furgaleus + Hemitriakis but not Iago); and part of the Triakinae (Mustelus, Scylliogaleus and part of Triakis). Interestingly, the molecular data provide considerable evidence of paraphyly of the genera Triakis and Mustelus. Our results suggest that the subgenera Triakis and Cazon of Triakis represent two distinct lineages that are only distantly related and that the genus Mustelus as currently defined does not constitute a monophyletic assemblage unless S. quecketti and some species of Triakis (subgenus Cazon) are included in Mustelus. Within our sample of species of Mustelus (including Cazon and Scylliogaleus), the sequence data support two well-defined clades that can be diagnosed by mode of reproduction (placental vs. aplacental species). The phylogenetic framework presented here is used to infer key events in the evolution and loss of placental viviparity among carcharhiniform sharks. (c) 2006 Elsevier Inc. All rights reserved.