The Early Cambrian trilobite family Emuellidae Pocock, 1970: Systematic position and revision of Australian species

John R. Paterson*, Gregory D. Edgecombe

*Corresponding author for this work

    Research output: Contribution to journalReview articlepeer-review

    39 Citations (Scopus)

    Abstract

    The family Emuellidae Pocock, 1970 was established for Emuella Pocock, 1970 and Balcoracania Pocock, 1970 from the Lower Cambrian of South Australia. Based on their peculiar trunk tagmosis, emuellids have been interpreted as the sister group of all other trilobites with dorsal facial sutures, and classified as high as the ordinal level. Cladistic analysis with a range of exemplar taxa of the Olenellina and Redlichiina instead resolves the emuellids within the Redlichiina, with tagmosis into a prothorax and opisthothorax ("telosoma") nonhomologous in olenellines and emuellids. A taxonomic revision of Australian species identifies Balcoracania flindersi as a junior subjective synonym of B. dailyi, whereas the two named species of Emuella are considered to be distinct. Balcoracania dailyi possesses up to 103 thoracic segments, the maximum number recorded in any trilobite.

    Original languageEnglish
    Pages (from-to)496-513
    Number of pages18
    JournalJournal of Paleontology
    Volume80
    Issue number3
    DOIs
    Publication statusPublished - May 2006

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