Nektaspid arthropods from the lower Cambrian emu bay shale lagerstätte, South Australia, with a reassessment of lamellipedian relationships

John R. Paterson*, Gregory D. Edgecombe, Diego C. GarcíA-Bellido, James B. Jago, James G. Gehling

*Corresponding author for this work

    Research output: Contribution to journalArticle

    48 Citations (Scopus)

    Abstract

    The lower Cambrian Emu Bay Shale on Kangaroo Island, South Australia, contains the only known Cambrian Burgess Shale-type biota in Australia. Two new lamellipedian arthropods, Emucaris fava gen. et sp. nov. and Kangacaris zhangi gen. et sp. nov., from the Emu Bay Shale Lagerstätte are described as monotypic genera that are resolved cladistically as a monophyletic group that is sister to Naraoiidae + Liwiidae and classified within the Nektaspida as a new family Emucarididae. Shared derived characters of Emucarididae involve a bipartite, elongate hypostome and elongation of the pygidium relative to the cephalic shield and very short thorax. A monophyletic Liwiidae is composed of Liwia and the Ordovician Tariccoia + Soomaspis but excludes Buenaspis, and even the membership of Buenaspis in Nektaspida is contradicted amongst the shortest cladograms. New morphological interpretations favour affinities of Kwanyinaspis with Conciliterga rather than with Aglaspidida, and Phytophilaspis with Petalopleura.

    Original languageEnglish
    Pages (from-to)377-402
    Number of pages26
    JournalPalaeontology
    Volume53
    Issue number2
    DOIs
    Publication statusPublished - Mar 2010

    Keywords

    • Arthropoda
    • Emucaris
    • Kangacaris
    • Lamellipedia
    • Nektaspida
    • Phylogeny

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