The platypus is not a rodent: DNA hybridization, amniote phylogeny and the palimpsest theory

Kirsch, John A. W.; Mayer, Gregory C.

doi:10.1098/rstb.1998.0278

Cited by 67Evolution and Paleontology StudiesGenomics and Phylogenetic StudiesPaleontology and Evolutionary Biology

The platypus is not a rodent: DNA hybridization, amniote phylogeny and the palimpsest theory

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Kirsch, John A. W., Mayer, Gregory C.·1998·Philosophical Transactions of the Royal Society of London. Series B: Biological Sciences

DOI 10.1098/rstb.1998.0278PMC PMC1692306

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Abstract

We present DNA–hybridization data on 21 amniotes and two anurans showing that discrimination is obtained among most of these at the class and lower levels. Trees generated from these data largely agree with conventional views, for example in not associating birds and mammals. However, the sister relationships found here of the monotremes to marsupials, and of turtles to the alligator, are surprising results which are nonetheless consistent with the results of some other studies. The Marsupionta hypothesis of Gregory is reviewed, as are opinions about the placement of chelonians. Anatomical and reproductive data considered by Gregory do not unequivocally preclude a marsupial–monotreme special relationship, and there is other recent evidence for placing turtles within the Diapsida. We conclude that the evidential meaning of the molecular data is as shown in the trees, but that the topologies may be influenced by a base–compositional bias producing a seemingly slow evolutionary rate in monotremes, or by algorithmic artefacts (in the case of turtles as well).

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This divergence estimate is similar to previous estimates but seems at odds with fossil evidence, perhaps owing to relatively recent reductions of mutational rates in the monotreme lineage.
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Authors: Kirsch, J. A. W., & Mayer, G. C.
Affiliations: University of Wisconsin System (US)
Corresponding author: Kirsch, John A. W.
Venue: Philosophical Transactions of the Royal Society of London. Series B: Biological Sciences
Publisher: The Royal Society
Published: 1998-07-29
Volume: 353
Issue: 1372
Pages: 1221-1237
ISSN: 0962-8436 (ISSN-L)
1471-2970
DOI: 10.1098/rstb.1998.0278
PMC: PMC1692306
OpenAlex: W2163609591
Cited by: 67
References: 124
Citations by year: 2026: 1 · 2020: 1 · 2016: 1 · 2015: 1 · 2012: 1
FWCI: 7.26
Type: journal article
Language: en
Open access: green
europepmc.org
Licence: royalsociety.org/journals/ethics-policies/data-sharing-mining/ (tdm)
Locations: Philosophical Transactions of the Royal Society B Biological Sciences (publishedVersion)
Europe PMC (PubMed Central) (publishedVersion)
PubMed Central (publishedVersion)
PubMed (publishedVersion)
Topics: Physical Sciences › Earth and Planetary Sciences › Paleontology › Evolution and Paleontology Studies
Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Phylogenetic Studies
Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Evolutionary Biology
Keywords: platypus, monotremes, amniote phylogeny, DNA hybridization, turtles, Diapsida, base composition bias, molecular phylogenetic tree
MeSH terms: Animals, DNA, Marsupialia, Models, Theoretical, Nucleic Acid Hybridization, Phylogeny, Platypus, Rodentia, Evolution, Molecular

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The platypus is not a rodent: DNA hybridization, amniote phylogeny and the palimpsest theory

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