Lack of support for Deuterostomia prompts reinterpretation of the first Bilateria
Lack of support for Deuterostomia prompts reinterpretation of the first Bilateria
复制标题
缺乏对 Deuterostomia 的支持促使重新解释第一个 Bilateria
DOI:
10.1101/2020.07.01.182915
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
Kapli P
中科院分区:
文献类型:
--
作者:
Kapli P
The bilaterally symmetric animals (Bilateria) are considered to comprise two monophyletic groups, Protostomia (Ecdysozoa and the Lophotrochozoa) and Deuterostomia (Chordata and the Xenambulacraria). Recent molecular phylogenetic studies have not consistently supported deuterostome monophyly. Here, we compare support for Protostomia and Deuterostomia using multiple, independent phylogenomic datasets. As expected, Protostomia is always strongly supported, especially by longer and higher-quality genes. Support for Deuterostomia, however, is always equivocal and barely higher than support for paraphyletic alternatives. Conditions that cause tree reconstruction errors—inadequate models, short internal branches, faster evolving genes, and unequal branch lengths—coincide with support for monophyletic deuterostomes. Simulation experiments show that support for Deuterostomia could be explained by systematic error. The branch between bilaterian and deuterostome common ancestors is, at best, very short, supporting the idea that the bilaterian ancestor may have been deuterostome-like. Our findings have important implications for the understanding of early animal evolution.
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