Cited by 64Genomics and Phylogenetic StudiesEvolution and Paleontology StudiesMarine Invertebrate Physiology and Ecology

THE AGE AND RELATIONSHIPS OF THE MAJOR ANIMAL PHYLA

Lynch, Michael·1999·Evolution

Abstract

Given the uncertainties in the fossil record and the paucity of informative morphological characters, there is still considerable uncertainty as to the phylogenetic affinities and times of origins of essentially all of the phyla of animals. A multilocus analysis of amino-acid sequence data for mitochondrial genes suggests that the major triploblast phyla began diverging approximately 630 million years ago. These results support the hypothesis that the so-called Cambrian radiation of animals actually initiated about 100 million years prior to the Cambrian, as the fossil evidence suggests. In addition, phylogenetic analysis supports the monophyly of animals, an early (~900 million years ago) branching off of the cnidarian lineage, the monophyly of deuterostomes and protostomes, and the inclusion of nematodes in the protostome lineage. The results of this study suggest that, with appropriate levels of taxon sampling and a focus on conserved regions of protein-coding sequence, complete mitochondrial genome analysis may be sufficiently powerful to elucidate the genealogical relationships of many of the animal phyla.

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Crossref · 10.1111/j.1558-5646.1999.tb03768.x

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  • Molecular phylogenies based on sequence comparisons of protein domains shared by all bilaterians suggest that the time of divergence of these proteins may extend back to 600-1,200 Ma ago.

    “Molecular phylogenies based on sequence comparisons of protein domains shared by all bilaterians suggest that the time of divergence of these proteins may extend back to 600–1,200 million years (megaannuum; Ma) ago (11–16).”

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Authors
Lynch, M.
Affiliations
University of Oregon (US)
Corresponding author
Lynch, Michael
Venue
Evolution
Published
1999-04
Volume
53
Issue
2
Pages
319-325
ISSN
0014-3820 (ISSN-L)
OpenAlex
W1999652349
Cited by
64
References
51
Citations by year
2024: 1 · 2022: 1 · 2021: 1 · 2020: 2 · 2016: 3 · 2015: 2 · 2012: 2
FWCI
2.42
Type
journal article
Language
en
Open access
closed
Locations
  • Evolution (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institutes of Health (RO1-GM36827)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Phylogenetic Studies
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Evolution and Paleontology Studies
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Marine Invertebrate Physiology and Ecology
Keywords
animal phylogeny, animal origins, divergence time estimation, Cambrian explosion, mitochondrial genes, amino acid sequence, deuterostomes, protostomes, nematodes, Cnidaria, molecular phylogeny

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