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    Evidence for a single loss of mineralized teeth in the common avian ancestor

    Access Status
    Open access via publisher
    Authors
    Meredith, R.
    Zhang, G.
    Gilbert, Thomas
    Jarvis, E.
    Springer, M.
    Date
    2014
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Meredith, R. and Zhang, G. and Gilbert, T. and Jarvis, E. and Springer, M. 2014. Evidence for a single loss of mineralized teeth in the common avian ancestor. Science. 346 (6215): pp. 1336-1344.
    Source Title
    Science
    DOI
    10.1126/science.1254390
    ISSN
    0036-8075
    School
    Department of Environment and Agriculture
    URI
    http://hdl.handle.net/20.500.11937/29106
    Collection
    • Curtin Research Publications
    Abstract

    Edentulism, the absence of teeth, has evolved convergently among vertebrates, including birds, turtles, and several lineages of mammals. Instead of teeth, modern birds (Neornithes) use a horny beak (rhamphotheca) and a muscular gizzard to acquire and process food. We performed comparative genomic analyses representing lineages of nearly all extant bird orders and recovered shared, inactivating mutations within genes expressed in both the enamel and dentin of teeth of other vertebrate species, indicating that the common ancestor of modern birds lacked mineralized teeth. We estimate that tooth loss, or at least the loss of enamel caps that provide the outer layer of mineralized teeth, occurred about 116 million years ago.

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