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Showing 1–8 of 8 results
Advanced filters: Author: Kate Trinajstic Clear advanced filters

  • The discovery of claspers in fossils of antiarch placoderms, an ancient group of armoured fish, suggests that internal fertilization was the ancestral type of reproduction for all jawed vertebrates: this contrasts with the current understanding that external fertilization must be the ancestral state.

    • John A. Long
    • Elga Mark-Kurik
    • Kate Trinajstic
    Research
    Nature
    Volume: 517, P: 196-199

  • The placoderms are a large group of primitive armoured fishes, which, although now extinct, could shed light on the evolution of jawed vertebrates. Recent fossil finds have been discovered with embryos, illustrating that fertilization was internal, but direct evidence for this was missing. Here, the discovery of a completely ossified pelvic clasper in a male Incisoscutum ritchiei confirms internal fertilization in arthrodires, a large and important placoderm group.

    • Per Ahlberg
    • Kate Trinajstic
    • John Long
    Research
    Nature
    Volume: 460, P: 888-889

  • This paper reveals evidence of embryos within Incisoscutum (a member of the arthrodires, a large, important and diverse group of placoderms). Incisoscutum had pelvic girdles of the right structure to support organs like the claspers of sharks, which are used in internal fertilization. The find confirms that internal fertilization and viviparity were much more widespread among the earliest jawed vertebrates than had previously been appreciated.

    • John A. Long
    • Kate Trinajstic
    • Zerina Johanson
    Research
    Nature
    Volume: 457, P: 1124-1127

  • The placoderms were a large and diverse group of distinctive fossil fishes, now thought to be the most primitive known vertebrates with jaws. Placoderm fossils from the Late Devonian Gogo Formation of Australia (about 380 million years ago) show a new species of placoderm, the specimen preserved with a single, large embryo connected to the adult by a mineralized remnant of an umbilical cord.

    • John A. Long
    • Kate Trinajstic
    • Tim Senden
    Research
    Nature
    Volume: 453, P: 650-652

  • Synchrotron radiation X-ray tomographic microscopy of a developmental series of Compagopiscis croucheri (Arthrodira) indicates that placoderms had true teeth, but that tooth and jaw development was not developmentally or structurally integrated in placoderms.

    • Martin Rücklin
    • Philip C. J. Donoghue
    • Marco Stampanoni
    Research
    Nature
    Volume: 491, P: 748-751