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  • Animals  (2)
  • Mammals/*anatomy & histology/*classification  (1)
  • Odontometry  (1)
  • 1
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    Evolutionary and preservational constraints on origins of biologic groups: divergence times of eutherian mammals (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-02-26
    Description: Some molecular clock estimates of divergence times of taxonomic groups undergoing evolutionary radiation are much older than the groups' first observed fossil record. Mathematical models of branching evolution are used to estimate the maximal rate of fossil preservation consistent with a postulated missing history, given the sum of species durations implied by early origins under a range of species origination and extinction rates. The plausibility of postulated divergence times depends on origination, extinction, and preservation rates estimated from the fossil record. For eutherian mammals, this approach suggests that it is unlikely that many modern orders arose much earlier than their oldest fossil records.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Foote, M -- Hunter, J P -- Janis, C M -- Sepkoski, J J Jr -- New York, N.Y. -- Science. 1999 Feb 26;283(5406):1310-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of the Geophysical Sciences, University of Chicago, 5734 South Ellis Avenue, Chicago, IL 60637, USA. mfoote@midway.uchicago.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10037598" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biological Evolution ; *Fossils ; *Mammals ; Mathematics ; *Models, Biological
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Molar tooth diversity, disparity, and ecology in Cenozoic ungulate radiations (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-11-29
    Description: A classic example of adaptive radiation is the diversification of Cenozoic ungulates into herbivore adaptive zones. Their taxonomic diversification has been associated with changes in molar tooth morphology. Analysis of molar crown types of the Artiodactyla, Perissodactyla, and archaic ungulates ("Condylarthra") shows that the diversity of genera and crown types was high in the Eocene. Post-Eocene molars of intermediate crown types are rare, and thus the ungulate fauna contained more taxa having fewer but more disparate crown types. Taxonomic diversity trends alone give incomplete descriptions of adaptive radiations.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jernvall, J -- Hunter, J P -- Fortelius, M -- New York, N.Y. -- Science. 1996 Nov 29;274(5292):1489-92.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Biotechnology and Department of Ecology and Systematics, Post Office Box 56, 00014 University of Helsinki, Finland. at Stony Brook, Stony Brook, NY 11794-436.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8929401" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Artiodactyla/anatomy & histology/classification ; Biological Evolution ; Diet ; Ecology ; Fossils ; History, Ancient ; Mammals/*anatomy & histology/*classification ; Molar/*anatomy & histology ; Odontometry ; *Paleodontology ; Perissodactyla/anatomy & histology/classification ; Species Specificity ; Tooth Crown/anatomy & histology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Expected Availability
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