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

Title
New data on 'Oikozetetes' (Mollusca: Halkieriidae) from the lower Cambrian of South Australia
Publication Date
2014
Author(s)
Jacquet, Sarah M
Brock, Glenn A
Paterson, John R
( author )
OrcID: https://orcid.org/0000-0003-2947-3912
Email: jpater20@une.edu.au
UNE Id une-id:jpater20
Type of document
Journal Article
Language
en
Entity Type
Publication
Publisher
Cambridge University Press
Place of publication
United States of America
DOI
10.1666/13-137
UNE publication id
une:17273
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 'Oikozetete's 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.
Link
Citation
Journal of Paleontology, 88(5), p. 1072-1084
ISSN
1937-2337
0022-3360
Start page
1072
End page
1084

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