Lake J A
Molecular Biology Institute, University of California, Los Angeles 90024.
Proc Natl Acad Sci U S A. 1990 Jan;87(2):763-6. doi: 10.1073/pnas.87.2.763.
The origin of the multicellular animals has been investigated by rate invariant analysis of 18S rRNA sequences. These analyses indicate that (i) the Metazoa is a monophyletic taxon; (ii) the Deuterostomia is a monophyletic taxon; (iii) the Annelida-Mollusca lineage is the sister group of an arthropod subgroup; and (iv) the last common ancestor of the Annelida-Mollusca lineage is most parsimoniously derived from a segmented, hemocoelic ancestor with an open circulatory system.
通过对18S rRNA序列进行速率不变分析，对多细胞动物的起源进行了研究。这些分析表明：（i）后生动物是一个单系类群；（ii）后口动物是一个单系类群；（iii）环节动物-软体动物谱系是一个节肢动物亚群的姐妹群；（iv）环节动物-软体动物谱系的最后一个共同祖先最简约地起源于具有开放式循环系统的分节、血腔祖先。
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