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    Pelvic and reproductive structures in placoderms (stem gnathostomes)

    Access Status
    Fulltext not available
    Authors
    Trinajstic, Katherine
    Boisvert, C.
    Long, J.
    Maksimenko, A.
    Johanson, Z.
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Trinajstic, K. and Boisvert, C. and Long, J. and Maksimenko, A. and Johanson, Z. 2015. Pelvic and reproductive structures in placoderms (stem gnathostomes). Biological Reviews. 90 (2): pp. 467-501.
    Source Title
    Biological Reviews
    DOI
    10.1111/brv.12118
    ISSN
    1464-7931
    School
    Department of Chemistry
    URI
    http://hdl.handle.net/20.500.11937/18611
    Collection
    • Curtin Research Publications
    Abstract

    Newly discovered pelvic and reproductive structures within placoderms, representing some of the most crownward members of the gnathostome stem group and the most basal jawed vertebrates, challenge established ideas on the origin of the pelvic girdle and reproductive complexity. Here we critically review previous descriptions of the pelvic structures in placoderms and reinterpret the morphology of the pelvic region within the arthrodires and ptyctodonts, in particular the position of the pelvic fin and the relationship of the male clasper to the pelvic girdle. Absence of clear articular surfaces on the clasper and girdle in the Arthrodira, along with evidence from the Ptyctodontida, suggest that these are separate structures along the body. We describe similarities between the pectoral and pelvic girdles and claspers, for example, all these have both dermal and perichondral (cartilaginous) components. Claspers in placoderms and chondrichthyans develop in very different ways; in sharks, claspers develop from the pelvic fin while the claspers in placoderms develop separately, suggesting that their independent development involved a posterior extension of the ‘competent stripes’ for fin development previously limited to the region between the paired pectoral and pelvic fins. Within this expanded zone, we suggest that clasper position relative to the pelvic fins was determined by genes responsible for limb position. Information on early gnathostome reproductive processes is preserved in both the Ptyctodontida and Arthrodira, including the presence of multiple embryos in pregnant females, embryos of differing sizes and of different sexes (e.g. male claspers preserved in some embyros). By comparison with chondrichthyans, these observations suggest more complex reproductive strategies in placoderms than previously appreciated.

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    • Pelvic and reproductive structures in placoderms (stem gnathostomes)
      Trinajstic, Kate; boisvert, C.; Long, J.; Maksimenko, A.; Johanson, Z. (2014)
      Newly discovered pelvic and reproductive structures within placoderms, representing some of the most crownward members of the gnathostome stem group and the most basal jawed vertebrates, challenge established ideas on the ...
    • Copulation in antiarch placoderms and the origin of gnathostome internal fertilization
      Long, J.; Mark-Kurik, E.; Johanson, Z.; Lee, M.; Young, G.; Min, Z.; Ahlberg, P.; Newman, M.; Jones, R.; den Blaauwen, J.; Choo, B.; Trinajstic, Katherine (2015)
      Reproduction in jawed vertebrates (gnathostomes) involves either external or internal fertilization1. It is commonly argued that internal fertilization can evolve from external, but not the reverse. Male copulatory claspers ...
    • New morphological information on the ptyctodontid fishes (Placodermi, Ptyctodontida) from Western Australia
      Trinajstic, Kate; Long, J.; Johanson, Z.; Young, G.; Senden, T. (2012)
      A full description of a complete and articulated, three-dimensionally preserved, placoderm fish, Materpiscis attenboroughi (Ptyctodontida), from the Late Devonian Gogo Formation is presented. The jaw articulation is unique ...
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