Metazoan phylogeny and the Cambrian radiation.
Metazoan phylogeny and the Cambrian radiation.
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DOI：
10.1016/0169-5347(91)90092-c
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发表时间：
1991-04
影响因子：
16.8
通讯作者：
D. Erwin
中科院分区：
文献类型：
--
作者：
D. Erwin
目前已有解剖学、胚胎学和古生物学等方面的方法来推断后生动物各门之间的关系，但由于各门之间缺乏同源特征，以及其他特征的趋同性，使得后生动物的系统发育问题难以达成共识。特别的困难包括无腔动物和有腔动物的双边动物之间的关系，后口动物、原口动物和lophate腔动物之间的关系（框1），腔空间的起源，软体动物的起源和关系，以及节肢动物之间多聚的可能性。分子序列的系统发育分析有望解决这些关系。然而，探索像后生动物起源这样的分化，需要选择一个分化速度足够慢的分子（或分子的一部分），以保存分支模式的证据，使用结构信息对齐序列，最后确定其起源
tive anatomy, embryology and paleontology have been used to infer relationships between metazoan phyla, but the lack of homologous characters between phyla and the convergent nature of other characters have made a consensus on metazoan phylogeny difficult to achieve. Particular difficulties include the relationships between the acoelomate and coelomate Bilateria, and between the deuterostome, protostome and lophophorate coelomates(Box I), the origin of coelomic spaces, the origin and relationships of the Mollusca, and the possibility of polyphyly among the Arthropoda’.Molecular sequence analysis Phylogenetic analysis of molecular sequences holds the promise of resolving these relationships. However, probing a divergence as deep as the origin of metazoans requires selecting a molecule (or parts of a molecule) with divergence rates slow enough to preserve evidence of the branching pattern, aligning the sequences using structural information, and finally, determining the