Phylogenetic analysis of molecular and morphological data highlights uncertainty in the relationships of fossil and living species of Elopomorpha (Actinopterygii: Teleostei)
Phylogenetic analysis of molecular and morphological data highlights uncertainty in the relationships of fossil and living species of Elopomorpha (Actinopterygii: Teleostei)
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DOI：
10.1016/j.ympev.2015.04.004
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发表时间：
2015-08-01
影响因子：
4.1
通讯作者：
Near, Thomas J.
中科院分区：
文献类型：
--
作者：
Dornburg, Alex;Friedman, Matt;Near, Thomas J.
Elopomorpha是现存硬骨鱼类的三个主要分支之一，包括一系列不同的谱系，包括鳗鱼，tarpons，骨鱼和盐龙。Elopomorphs是使用Hennigian系统发育方法研究的第一组鱼类之一，并且由于其经济意义，多样性和作为所有其他硬骨鱼的姐妹群的重要进化地位，仍然是系统发育研究的对象。虽然Elopomorpha的系统发育骨干部分在研究之间是一致的，但Albula，Pterothrissus，Notacanthiformes和Anguilliformes之间的关系仍然存在争议，难以评估。这种缺乏系统发育分辨率是有问题的，因为化石谱系经常被描述和分类放置基于一个假设的姐妹群之间的关系Albula和Pterothrissus。此外，系统发育研究使用的形态学数据，样品elophomorph化石谱系往往不包括notacanthiform或anguilliform谱系，可能会引入一个偏见，解释化石的共同干的成员Pterothrissus和Albula。在这里，我们提供了一个系统发育分析的DNA序列采样从多个核基因，包括代表性的类群从Albula，Pterothrissus，Notacanthiformes和Anguilliformes。我们将我们的分子数据集与形态特征矩阵，跨越生活和化石elepomorph谱系。我们的研究结果揭示了大量的不确定性，以及所有采样的化石谱系的Pterothrissus的位置，质疑化石Elopomorpha的分类的稳定性。然而，尽管拓扑的不确定性，我们的整合到贝叶斯时间校准框架的化石谱系提供了分歧的时间估计的进化枝是一致的，与以前公布的年龄估计的基础上elophomorph化石记录和分子估计传统的节点测年方法。(C)2015 Elsevier Inc. All rights reserved.
Elopomorpha is one of the three main clades of living teleost fishes and includes a range of disparate lineages including eels, tarpons, bonefishes, and halosaurs. Elopomorphs were among the first groups of fishes investigated using Hennigian phylogenetic methods and continue to be the object of intense phylogenetic scrutiny due to their economic significance, diversity, and crucial evolutionary status as the sister group of all other teleosts. While portions of the phylogenetic backbone for Elopomorpha are consistent between studies, the relationships among Albula, Pterothrissus, Notacanthiformes, and Anguilliformes remain contentious and difficult to evaluate. This lack of phylogenetic resolution is problematic as fossil lineages are often described and placed taxonomically based on an assumed sister group relationship between Albula and Pterothrissus. In addition, phylogenetic studies using morphological data that sample elopomorph fossil lineages often do not include notacanthiform or anguilliform lineages, potentially introducing a bias toward interpreting fossils as members of the common stem of Pterothrissus and Albula. Here we provide a phylogenetic analysis of DNA sequences sampled from multiple nuclear genes that include representative taxa from Albula, Pterothrissus, Notacanthiformes and Anguilliformes. We integrate our molecular dataset with a morphological character matrix that spans both living and fossil elopomorph lineages. Our results reveal substantial uncertainty in the placement of Pterothrissus as well as all sampled fossil lineages, questioning the stability of the taxonomy of fossil Elopomorpha. However, despite topological uncertainty, our integration of fossil lineages into a Bayesian time calibrated framework provides divergence time estimates for the clade that are consistent with previously published age estimates based on the elopomorph fossil record and molecular estimates resulting from traditional node-dating methods. (C) 2015 Elsevier Inc. All rights reserved.