Taxonomic revision of buchanosteioid placoderms (Arthrodira) from the Early Devonian of south-eastern Australia and Arctic Russia

John Long, Elga Mark-Kurik, Gavin Young

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    The 'buchanosteid' placoderms are best known from the Early Devonian of Australia, but also occur in China, Russia, Central Asia and the Middle East. Here we rediagnose the type species Buchanosteus confertituberculatus (Hills 1936) from the type locality at Buchan, Victoria, in the light of new material of both head and trunk shields. The superfamily Buchanosteoidea Denison, 1978 is redefined to unite taxa that share a similar skull roof with separate rostro-pineal (ethmoid) bone, and postethmoid skull pattern characterised by a large trapezoidal nuchal, strap-like short and broad preorbitals, large subrectangular centrals, small postorbitals not contacting the paranuchals, and large, elongate marginal plates. The Family Buchanosteidae is redefined on skull roof and parasphenoid shape and trunk armour features as a monotypic family within the Buchanosteoidea. A new family (Parabuchanosteidae nov.) includes taxa with the posterior lateral plate overlapping the anterior dorsolateral plate externally. Two new buchanosteids are described, Richardosteus barwickorum gen. et sp. nov., from Burrinjuck, south-eastern Australia, and Urvaspis lithuanica gen. et sp. nov., from Severnaya Zemlya, Russia.

    Original languageEnglish
    Pages (from-to)26-43
    Number of pages18
    JournalAustralian Journal of Zoology
    Volume62
    Issue number1
    DOIs
    Publication statusPublished - 2014

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