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. 1990 Jan;87(2):763–766. doi: 10.1073/pnas.87.2.763

Origin of the Metazoa.

J A Lake 1
PMCID: PMC53346  PMID: 2300560

Abstract

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.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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