A Darriwilian (Middle Ordovician) bivalve-dominated molluscan fauna from the Stairway Sandstone, Amadeus Basin, central Australia
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, Sthenodo...
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| Format: | Article |
| Language: | English |
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Institute of Paleobiology PAS
2016-12-01
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| Series: | Acta Palaeontologica Polonica |
| Subjects: | |
| Online Access: | http://www.app.pan.pl/archive/published/app61/app002152015.pdf |
| _version_ | 1819109103346122752 |
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| author | Kristian G. Jakobsen Glenn A. Brock Arne T. Nielsen |
| author_facet | Kristian G. Jakobsen Glenn A. Brock Arne T. Nielsen |
| author_sort | Kristian G. Jakobsen |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-22T03:20:30Z |
| format | Article |
| id | doaj.art-227d85add0784e45bcf72d5cbd0fb576 |
| institution | Directory Open Access Journal |
| issn | 0567-7920 1732-2421 |
| language | English |
| last_indexed | 2024-12-22T03:20:30Z |
| publishDate | 2016-12-01 |
| publisher | Institute of Paleobiology PAS |
| record_format | Article |
| series | Acta Palaeontologica Polonica |
| spelling | doaj.art-227d85add0784e45bcf72d5cbd0fb5762022-12-21T18:40:44ZengInstitute of Paleobiology PASActa Palaeontologica Polonica0567-79201732-24212016-12-0161489792410.4202/app.00215.2015A Darriwilian (Middle Ordovician) bivalve-dominated molluscan fauna from the Stairway Sandstone, Amadeus Basin, central AustraliaKristian G. Jakobsen0Glenn A. Brock1Arne T. Nielsen2Geological Museum, Natural History Museum of Denmark, University of Copenhagen, Øster Voldgade 5–7, DK-1350 Copenhagen, Denmark; and Department of Biological Sciences, Macquarie University, New South Wales 2109, AustraliaDepartment of Biological Sciences, Macquarie University, New South Wales 2109, AustraliaGeological Museum, Natural History Museum of Denmark, University of Copenhagen, Øster Voldgade 5–7, DK-1350 Copenhagen, DenmarkA 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.http://www.app.pan.pl/archive/published/app61/app002152015.pdfMolluscaBivalviaendemicitybiodiversityOrdovicianDarriwilianCentral Australia |
| spellingShingle | Kristian G. Jakobsen Glenn A. Brock Arne T. Nielsen A Darriwilian (Middle Ordovician) bivalve-dominated molluscan fauna from the Stairway Sandstone, Amadeus Basin, central Australia Acta Palaeontologica Polonica Mollusca Bivalvia endemicity biodiversity Ordovician Darriwilian Central Australia |
| title | A Darriwilian (Middle Ordovician) bivalve-dominated molluscan fauna from the Stairway Sandstone, Amadeus Basin, central Australia |
| title_full | A Darriwilian (Middle Ordovician) bivalve-dominated molluscan fauna from the Stairway Sandstone, Amadeus Basin, central Australia |
| title_fullStr | A Darriwilian (Middle Ordovician) bivalve-dominated molluscan fauna from the Stairway Sandstone, Amadeus Basin, central Australia |
| title_full_unstemmed | A Darriwilian (Middle Ordovician) bivalve-dominated molluscan fauna from the Stairway Sandstone, Amadeus Basin, central Australia |
| title_short | A Darriwilian (Middle Ordovician) bivalve-dominated molluscan fauna from the Stairway Sandstone, Amadeus Basin, central Australia |
| title_sort | darriwilian middle ordovician bivalve dominated molluscan fauna from the stairway sandstone amadeus basin central australia |
| topic | Mollusca Bivalvia endemicity biodiversity Ordovician Darriwilian Central Australia |
| url | http://www.app.pan.pl/archive/published/app61/app002152015.pdf |
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