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

31 Citations (Scopus)
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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.

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