A new basal actinopterygian fish from the Middle Devonian Aztec Siltstone of Antarctica
Abstract A new basal actinopterygian fish, Donnrosenia schaefferi gen. et sp. nov., is described from the Middle Devonian (Givetian) Aztec Siltstone of southern Victoria Land, Antarctica. Donnrosenia gen. nov. is characterized by the large parietals which are of almost equivalent size to the frontal...
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Cambridge University Press (CUP)
2008
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Online Access: | http://dx.doi.org/10.1017/s0954102008001144 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102008001144 |
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crcambridgeupr:10.1017/s0954102008001144 2024-09-15T17:48:40+00:00 A new basal actinopterygian fish from the Middle Devonian Aztec Siltstone of Antarctica Long, John A. Choo, Brian Young, Gavin C. 2008 http://dx.doi.org/10.1017/s0954102008001144 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102008001144 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 20, issue 4, page 393-412 ISSN 0954-1020 1365-2079 journal-article 2008 crcambridgeupr https://doi.org/10.1017/s0954102008001144 2024-07-31T04:04:15Z Abstract A new basal actinopterygian fish, Donnrosenia schaefferi gen. et sp. nov., is described from the Middle Devonian (Givetian) Aztec Siltstone of southern Victoria Land, Antarctica. Donnrosenia gen. nov. is characterized by the large parietals which are of almost equivalent size to the frontals, very small intertemporals, a small accessory operculum situated dorsally to the prominent anterodorsal process of the suboperculum, a deep dentary with anterior flexure, porous ornamentation on the clavicle, an elongate body form with macromeric squamation, an absence of paired fringing fulcra on the fins, and pectoral lepidotrichia which are unsegmented for much of their length. A phylogenetic analysis based on dermal skeletal features of Devonian actinopterygians indicates that Donnrosenia gen. nov. is the sister taxon to Howqualepis from the Middle Devonian of Victoria, Australia, and is embedded within a possible clade containing the actinopterygians from the Gogo Formation, Western Australia. This supports the concept of an endemic radiation of East Gondwanan actinopterygians, and reinforces the already strong biogeographical similarities between the Middle Devonian palaeofaunas of Australia and Antarctica. Article in Journal/Newspaper Antarc* Antarctic Science Antarctica Victoria Land Cambridge University Press Antarctic Science 20 4 393 412 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract A new basal actinopterygian fish, Donnrosenia schaefferi gen. et sp. nov., is described from the Middle Devonian (Givetian) Aztec Siltstone of southern Victoria Land, Antarctica. Donnrosenia gen. nov. is characterized by the large parietals which are of almost equivalent size to the frontals, very small intertemporals, a small accessory operculum situated dorsally to the prominent anterodorsal process of the suboperculum, a deep dentary with anterior flexure, porous ornamentation on the clavicle, an elongate body form with macromeric squamation, an absence of paired fringing fulcra on the fins, and pectoral lepidotrichia which are unsegmented for much of their length. A phylogenetic analysis based on dermal skeletal features of Devonian actinopterygians indicates that Donnrosenia gen. nov. is the sister taxon to Howqualepis from the Middle Devonian of Victoria, Australia, and is embedded within a possible clade containing the actinopterygians from the Gogo Formation, Western Australia. This supports the concept of an endemic radiation of East Gondwanan actinopterygians, and reinforces the already strong biogeographical similarities between the Middle Devonian palaeofaunas of Australia and Antarctica. |
format |
Article in Journal/Newspaper |
author |
Long, John A. Choo, Brian Young, Gavin C. |
spellingShingle |
Long, John A. Choo, Brian Young, Gavin C. A new basal actinopterygian fish from the Middle Devonian Aztec Siltstone of Antarctica |
author_facet |
Long, John A. Choo, Brian Young, Gavin C. |
author_sort |
Long, John A. |
title |
A new basal actinopterygian fish from the Middle Devonian Aztec Siltstone of Antarctica |
title_short |
A new basal actinopterygian fish from the Middle Devonian Aztec Siltstone of Antarctica |
title_full |
A new basal actinopterygian fish from the Middle Devonian Aztec Siltstone of Antarctica |
title_fullStr |
A new basal actinopterygian fish from the Middle Devonian Aztec Siltstone of Antarctica |
title_full_unstemmed |
A new basal actinopterygian fish from the Middle Devonian Aztec Siltstone of Antarctica |
title_sort |
new basal actinopterygian fish from the middle devonian aztec siltstone of antarctica |
publisher |
Cambridge University Press (CUP) |
publishDate |
2008 |
url |
http://dx.doi.org/10.1017/s0954102008001144 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102008001144 |
genre |
Antarc* Antarctic Science Antarctica Victoria Land |
genre_facet |
Antarc* Antarctic Science Antarctica Victoria Land |
op_source |
Antarctic Science volume 20, issue 4, page 393-412 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102008001144 |
container_title |
Antarctic Science |
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20 |
container_issue |
4 |
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393 |
op_container_end_page |
412 |
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1810290145552760832 |