The oldest brachiopods from the lower Cambrian of South Australia

Timothy P. Topper*, Lars E. Holmer, Christian B. Skovsted, Glenn A. Brock, Uwe Balthasar, Cecilia M. Larsson, Sandra Pettersson Stolk, David A T Harper

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    35 Citations (Scopus)
    108 Downloads (Pure)

    Abstract

    The morphology and organophosphatic shell structure of the paterinate brachiopod Askepasma is documented using new and previously collected specimens from the lower Cambrian of South Australia. Lack of adequately preserved material has seen the majority of paterinate specimens previously reported from South Australia referred to the genus Askepasma and treated under open nomenclature. Large collections of paterinates from the lower Cambrian Wilkawillina, Ajax, and Wirrapowie limestones in the Arrowie Basin, South Australia have prompted redescription of the type species Askepasma toddense and the erection of a new species, Askepasma saproconcha sp. nov. Askepasma saproconcha sp. nov. currently represents the oldest known brachiopod from the lower Cambrian successions in South Australia with a FAD in pre-trilobitic (Terreneuvian, Cambrian Stage 2, lower Atdabanian) strata in the basal part of the Wilkawillina and Wirrapowie limestones. Askepasma toddense predominantly occurs in Abadiella huoi Zone equivalent strata (Unnamed Cambrian Series 2, Stage 3, middle-upper Atdabanian) in the upper part of the lower Wilkawillina, Wirrapowie, and Ajax limestones. The shell microstructure of Askepasma suggests a proximal stem group position within the Brachiopoda and similarities with tommotiid taxa provides further evidence that the ancestry of crown group brachiopods is firmly entrenched within the Tommotiida.

    Original languageEnglish
    Pages (from-to)93-109
    Number of pages17
    JournalActa Palaeontologica Polonica
    Volume58
    Issue number1
    DOIs
    Publication statusPublished - Mar 2013

    Bibliographical note

    Copyright 2013 T.P. Topper et al. Article originally published in Acta Palaeontologica Polonica 58 (1), 2013: 93-109. The original article can be found at http://dx.doi.org/10.4202/app.2011.0146. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

    Fingerprint

    Dive into the research topics of 'The oldest brachiopods from the lower Cambrian of South Australia'. Together they form a unique fingerprint.

    Cite this