A Darriwilian (Middle Ordovician) Bivalve-Dominated Molluscan Fauna from the Stairway Sandstone, Amadeus Basin, Central Australia

Kristian G. Jakobsen, Glenn A. Brock, Arne T. Nielsen, David A T Harper

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Abstract

A bivalve-dominated molluscan fauna is described from the Darriwilian (Middle Ordovician) Stairway Sandstone, Amadeus Basin, central Australia. The fauna comprises 16 species of bivalves and rostroconchs plus six gastropod species which are treated under open nomenclature. Two new bivalves, Sthenodonta paenesymmetrica sp. nov. and Modiolopsis pojetai sp. nov., are described. The relatively low-diverse molluscan fauna constitutes around 62% of the total benthic macrofauna. Approximately 75% of the molluscs comprise bivalves, especially nuculoids, which were biogeographically restricted to low latitudes during the Ordovician. The molluscan assemblage displays a very high degree of endemism at species level, though the bivalve Sthenodonta eastii also occurs in the Georgina Basin farther to the northeast. This indicates a possible marine connective seaway between the Georgina and Amadeus basins during the Darriwilian. Nuculites, Cyrtodonta, and Modiolopsis are cosmopolitan and previously reported from North China, Avalonia, and Southern Gondwana.

Original languageEnglish
Pages (from-to)897-924
Number of pages28
JournalActa Palaeontologica Polonica
Volume61
Issue number4
DOIs
Publication statusPublished - 1 Dec 2016

Bibliographical note

Copyright the Author(s) 2016. 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.

Keywords

  • biodiversity
  • Bivalvia
  • Central Australia
  • Darriwilian
  • endemicity
  • Mollusca
  • Ordovician

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