Origin of the Metazoa

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 monophylectic taxon; (ii) the Deuterostomia is a monophyletic taxon; (iii) the Annelida-Mollusca lineage is the sister group of an arthrop...

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Bibliographic Details
Published in:Proceedings of the National Academy of Sciences - PNAS 1990-01, Vol.87 (2), p.763-766
Main Author: Lake, James A.
Format: Article
Language:English
Subjects:
Animal Population Groups - classification
Animal Population Groups - genetics
Animals
Annelida - classification
Arthropods
Biological and medical sciences
Biological Evolution
Deuterostomia
Evolution
Fossils
Fundamental and applied biological sciences. Psychology
General aspects
Metazoa
Mollusca - classification
Parsimony
Phylogeny
Plant morphology
Plant roots
RNA, Ribosomal - genetics
RNA, Ribosomal, 18S - genetics
Taxa
Topology
Vertebrates: general zoology, morphology, phylogeny, systematics, cytogenetics, geographical distribution
Yeasts
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Summary: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 monophylectic 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.
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.87.2.763