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Pelvic claspers confirm chondrichthyan-like internal fertilization in arthrodires

Author

Listed:
  • Per Ahlberg

    (Uppsala University, Norbyvägen 18A, 752 36 Uppsala, Sweden)

  • Kate Trinajstic

    (Western Australian Organic and Isotope Geochemistry Centre, Curtin University, Perth, Western Australia 6102, Australia
    Earth and Planetary Sciences, Western Australian Museum, Perth, Western Australia 6000, Australia
    School of Earth and Environment, The University of Western Australia, Perth, Western Australia 6009, Australia)

  • Zerina Johanson

    (Natural History Museum, Cromwell Road, London SW7 5BD, UK)

  • John Long

    (Museum Victoria, PO Box 666, Melbourne, Victoria 3001, Australia
    Research School of Earth Sciences, The Australian National University, Canberra, Australian Capital Territory 2600,
    School of Geosciences, Monash University, Clayton, Victoria 3800, Australia)

Abstract

Early internal fertilization The placoderms are a large group of primitive armoured fishes. Although wholly extinct, their enigmatic anatomy could hold clues to the evolution of the jawed vertebrates (gnathostomes), including ourselves. A new fossil discovery has clarified the mechanism of reproduction in Incisoscutum, an organism of particular interest as a member of the arthrodires, a large and important placoderm group. A well preserved fossil of an adult Incisoscutum ritcchiei female was recently found with embryos, evidence that fertilization was internal. The new fossil is of a male of the species, showing the presence of penis-like pelvic claspers similar to those found in fossil Ptyctodontida (a group of unarmoured placoderms) and in sharks.

Suggested Citation

  • Per Ahlberg & Kate Trinajstic & Zerina Johanson & John Long, 2009. "Pelvic claspers confirm chondrichthyan-like internal fertilization in arthrodires," Nature, Nature, vol. 460(7257), pages 888-889, August.
    • Handle: RePEc:nat:nature:v:460:y:2009:i:7257:d:10.1038_nature08176
    DOI: 10.1038/nature08176
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