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

doi:10.4202/app.00215.2015

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

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

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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 language	English
Pages (from-to)	897-924
Number of pages	28
Journal	Acta Palaeontologica Polonica
Volume	61
Issue number	4
DOIs	https://doi.org/10.4202/app.00215.2015
Publication status	Published - 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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10.4202/app.00215.2015

Publisher version (open access)Final published version, 2.85 MB

Cite this

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

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.",

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AU - Jakobsen, Kristian G.

AU - Brock, Glenn A.

AU - Nielsen, Arne T.

AU - Harper, David A T

N1 - 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.

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N2 - 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.

AB - 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.

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KW - endemicity

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

Abstract

Bibliographical note

Keywords

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Fossils, rocks and early Cambrian clocks: Calibrating body plan assembly and lineage splits in ancestral animals from Gondwana

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

Abstract

Bibliographical note

Keywords

Access to Document

Other files and links

Fingerprint

Projects

Fossils, rocks and early Cambrian clocks: Calibrating body plan assembly and lineage splits in ancestral animals from Gondwana

Cite this