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    Fossilized ontogenies: The contribution of placoderm ontogeny to our understanding of the evolution of early gnathostomes

    Access Status
    Fulltext not available
    Authors
    Johanson, Z.
    Trinajstic, Katherine
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Johanson, Z. and Trinajstic, K. 2014. Fossilized ontogenies: The contribution of placoderm ontogeny to our understanding of the evolution of early gnathostomes. Palaeontology. 57 (3): pp. 505-516.
    Source Title
    Palaeontology
    DOI
    10.1111/pala.12093
    ISSN
    0031-0239
    URI
    http://hdl.handle.net/20.500.11937/46231
    Collection
    • Curtin Research Publications
    Abstract

    Placoderms, representing phylogenetically more inclusive jawed vertebrates and successive sister taxa to crown-group gnathostomes, are critical to our understanding of character evolution within the crown-group (chondrichthyans + osteichthyans), including developmental characters. Early ontogenetic stages of placoderms are generally poorly known, although some exceptional faunas preserve both embryonic (e.g. from the Gogo Formation, Western Australia) and post-embryonic individuals (the Miguasha Formation, Canada; Lode Formation, Latvia; Merriganowry Formation, Gogo Formation, Australia). Information provided by these ontogenies is relevant to questions of placoderm taxonomy and phylogeny, but also to broader questions pertinent to vertebrate evolution as a whole, for example, evolution of bone development, evolution of the axial skeleton and evolution of reproduction.

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