THE AGE AND RELATIONSHIPS OF THE MAJOR ANIMAL PHYLA
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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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).”
From Precambrian animal diversity: Putative phosphatized embryos from the Doushantuo Formation of China (2000) · cites this paper as [15]
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- Authors
- Lynch, M.
- Affiliations
- University of Oregon (US)
- Corresponding author
- Lynch, Michael
- ORCID
- Lynch, Michael
- Venue
- Evolution
- Publisher
- Oxford University Press (OUP)
- 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
- Licence
- 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
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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