Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 1990 Jan;87(2):763-6.
doi: 10.1073/pnas.87.2.763.

Origin of the Metazoa

J A Lake  1
Affiliations

Origin of the Metazoa

J A Lake. Proc Natl Acad Sci U S A. 1990 Jan.

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.

PubMed Disclaimer

References

    1. J Mol Evol. 1981;18(1):30-7 - PubMed
    1. Science. 1988 Feb 12;239(4841 Pt 1):748-53 - PubMed
    1. Mol Biol Evol. 1988 May;5(3):201-16 - PubMed
    1. J Mol Evol. 1982;18(4):225-39 - PubMed
    1. Mol Biol Evol. 1989 May;6(3):301-16 - PubMed

Publication types

LinkOut - more resources