New data on Oikozetetes (Mollusca, Halkieriidae) from the lower Cambrian of South Australia

Sarah M. Jacquet, Glenn A. Brock, John R. Paterson

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

A new species of Oikozetetes, O. mounti n. sp. is described from the upper Mernmerna Formation (equivalent to Cambrian Series 2) in the eastern Flinders Ranges, South Australia. Description of both shell morphotypes (morph A and B) from the same stratigraphic horizon favors the interpretation of a two-shelled scleritome for Oikozetetes. Identification of at least two types of halkieriid sclerite (palmates and siculates) in stratigraphic association with the Halkieria-like shells of Oikozetetes suggests that these elements are derived from the same scleritome. This provides evidence against previous suggestions that the Gondwanan species was aspiculate; the scleritome arrangement is interpreted to be similar to Halkieria evangelista Conway Morris and Peel, 1995 and supports placement in the family Halkieriidae Poulsen, 1967. Comparison of modes of accretionary growth in Oikozetetes shell morphotypes to Halkieria shells and terminal plates in modern polyplacophorans, supports a scleritome model that places shell morphs A and B in posterior and anterior locations, respectively, along the axis of the body.

Original languageEnglish
Pages (from-to)1072-1084
Number of pages13
JournalJournal of Paleontology
Volume88
Issue number5
DOIs
Publication statusPublished - Sep 2014

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