Description of two new species of Dorsiceratus Drzycimski, 1967 (Copepoda: Harpacticoida: Ancorabolidae) from Sedlo and Seine Seamounts (Northeastern Atlantic) and remarks on the phylogenetic status of the genus
Two new species of Dorsiceratus Drzycimski, 1967 (Copepoda, Harpacticoida, Ancorabolidae), Dorsiceratus wilhelminae sp. nov. and D. dinah sp. nov. are described from Sedlo and Seine Seamounts, respectively (both northeast Atlantic). These are the first records of Dorsiceratus species from seamount s...
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2009
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ftmagnoliapress:oai:ojs.mapress.com:article/6371 2023-05-15T17:41:37+02:00 Description of two new species of Dorsiceratus Drzycimski, 1967 (Copepoda: Harpacticoida: Ancorabolidae) from Sedlo and Seine Seamounts (Northeastern Atlantic) and remarks on the phylogenetic status of the genus GEORGE, KAI HORST PLUM, CHRISTOPH 2009-05-11 application/pdf https://www.mapress.com/j/zt/article/view/zootaxa.2096.1.15 https://doi.org/10.11646/zootaxa.2096.1.15 eng eng Mangolia Press https://www.mapress.com/j/zt/article/view/zootaxa.2096.1.15/28463 Copyright (c) 2015 Zootaxa Zootaxa; Vol 2096, No 1: 11 May. 2009; 257–286 1175-5334 1175-5326 10.11646/zootaxa.2096.1 Crustacea Systematics deep sea seamounts OASIS Ancorabolinae Ceratonotus-group Dorsiceratus wilhelminae sp. nov. Dorsiceratus dinah sp.nov info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2009 ftmagnoliapress https://doi.org/10.11646/zootaxa.2096.1.15 2019-09-10T15:07:39Z Two new species of Dorsiceratus Drzycimski, 1967 (Copepoda, Harpacticoida, Ancorabolidae), Dorsiceratus wilhelminae sp. nov. and D. dinah sp. nov. are described from Sedlo and Seine Seamounts, respectively (both northeast Atlantic). These are the first records of Dorsiceratus species from seamount summits. Both new species resemble the described species D. octocornis Drzycimski, 1967, D. triarticulatus Coull, 1973, and D. ursulae George, 2006, with respect to most morphological features. On the other hand, D. wilhelminae sp. nov. has long spinules at the inner margin of the A2 enp, while D. dinah sp. nov. bears two, rather than one, tubepores dorsally on third abdominal somite, and a geniculate first outer seta on P1 exp2. These characters are considered as apomorphic relative to the described Dorsiceratus species. As discussed in the present paper, the maintenance of a genus Dorsiceratus appears to be problematic. Although specimens may be assigned without difficulty to a group “Dorsiceratus”, such assignments are based on diagnostic features only; no clear-cut apomorphies have been detected so far to characterize the monophyly of Dorsiceratus. Just two apomorphic characters appear to be synapomorphies for all of the described Dorsiceratus species: 1) P2 enp2 with one rather than two setae and 2) P4 exp sexually dimorphic. Unfortunately, these features are relatively widespread within the Ceratonotus-group sensu Conroy-Dalton (2001) and therefore of rather low value. The authors decided, however, to retain the genus Dorsiceratus until new insights provide more information to support or disprove that hypothesis. Article in Journal/Newspaper Northeast Atlantic Magnolia press Seta ENVELOPE(9.895,9.895,63.645,63.645) Zootaxa 2096 1 257 286 |
institution |
Open Polar |
collection |
Magnolia press |
op_collection_id |
ftmagnoliapress |
language |
English |
topic |
Crustacea Systematics deep sea seamounts OASIS Ancorabolinae Ceratonotus-group Dorsiceratus wilhelminae sp. nov. Dorsiceratus dinah sp.nov |
spellingShingle |
Crustacea Systematics deep sea seamounts OASIS Ancorabolinae Ceratonotus-group Dorsiceratus wilhelminae sp. nov. Dorsiceratus dinah sp.nov GEORGE, KAI HORST PLUM, CHRISTOPH Description of two new species of Dorsiceratus Drzycimski, 1967 (Copepoda: Harpacticoida: Ancorabolidae) from Sedlo and Seine Seamounts (Northeastern Atlantic) and remarks on the phylogenetic status of the genus |
topic_facet |
Crustacea Systematics deep sea seamounts OASIS Ancorabolinae Ceratonotus-group Dorsiceratus wilhelminae sp. nov. Dorsiceratus dinah sp.nov |
description |
Two new species of Dorsiceratus Drzycimski, 1967 (Copepoda, Harpacticoida, Ancorabolidae), Dorsiceratus wilhelminae sp. nov. and D. dinah sp. nov. are described from Sedlo and Seine Seamounts, respectively (both northeast Atlantic). These are the first records of Dorsiceratus species from seamount summits. Both new species resemble the described species D. octocornis Drzycimski, 1967, D. triarticulatus Coull, 1973, and D. ursulae George, 2006, with respect to most morphological features. On the other hand, D. wilhelminae sp. nov. has long spinules at the inner margin of the A2 enp, while D. dinah sp. nov. bears two, rather than one, tubepores dorsally on third abdominal somite, and a geniculate first outer seta on P1 exp2. These characters are considered as apomorphic relative to the described Dorsiceratus species. As discussed in the present paper, the maintenance of a genus Dorsiceratus appears to be problematic. Although specimens may be assigned without difficulty to a group “Dorsiceratus”, such assignments are based on diagnostic features only; no clear-cut apomorphies have been detected so far to characterize the monophyly of Dorsiceratus. Just two apomorphic characters appear to be synapomorphies for all of the described Dorsiceratus species: 1) P2 enp2 with one rather than two setae and 2) P4 exp sexually dimorphic. Unfortunately, these features are relatively widespread within the Ceratonotus-group sensu Conroy-Dalton (2001) and therefore of rather low value. The authors decided, however, to retain the genus Dorsiceratus until new insights provide more information to support or disprove that hypothesis. |
format |
Article in Journal/Newspaper |
author |
GEORGE, KAI HORST PLUM, CHRISTOPH |
author_facet |
GEORGE, KAI HORST PLUM, CHRISTOPH |
author_sort |
GEORGE, KAI HORST |
title |
Description of two new species of Dorsiceratus Drzycimski, 1967 (Copepoda: Harpacticoida: Ancorabolidae) from Sedlo and Seine Seamounts (Northeastern Atlantic) and remarks on the phylogenetic status of the genus |
title_short |
Description of two new species of Dorsiceratus Drzycimski, 1967 (Copepoda: Harpacticoida: Ancorabolidae) from Sedlo and Seine Seamounts (Northeastern Atlantic) and remarks on the phylogenetic status of the genus |
title_full |
Description of two new species of Dorsiceratus Drzycimski, 1967 (Copepoda: Harpacticoida: Ancorabolidae) from Sedlo and Seine Seamounts (Northeastern Atlantic) and remarks on the phylogenetic status of the genus |
title_fullStr |
Description of two new species of Dorsiceratus Drzycimski, 1967 (Copepoda: Harpacticoida: Ancorabolidae) from Sedlo and Seine Seamounts (Northeastern Atlantic) and remarks on the phylogenetic status of the genus |
title_full_unstemmed |
Description of two new species of Dorsiceratus Drzycimski, 1967 (Copepoda: Harpacticoida: Ancorabolidae) from Sedlo and Seine Seamounts (Northeastern Atlantic) and remarks on the phylogenetic status of the genus |
title_sort |
description of two new species of dorsiceratus drzycimski, 1967 (copepoda: harpacticoida: ancorabolidae) from sedlo and seine seamounts (northeastern atlantic) and remarks on the phylogenetic status of the genus |
publisher |
Mangolia Press |
publishDate |
2009 |
url |
https://www.mapress.com/j/zt/article/view/zootaxa.2096.1.15 https://doi.org/10.11646/zootaxa.2096.1.15 |
long_lat |
ENVELOPE(9.895,9.895,63.645,63.645) |
geographic |
Seta |
geographic_facet |
Seta |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_source |
Zootaxa; Vol 2096, No 1: 11 May. 2009; 257–286 1175-5334 1175-5326 10.11646/zootaxa.2096.1 |
op_relation |
https://www.mapress.com/j/zt/article/view/zootaxa.2096.1.15/28463 |
op_rights |
Copyright (c) 2015 Zootaxa |
op_doi |
https://doi.org/10.11646/zootaxa.2096.1.15 |
container_title |
Zootaxa |
container_volume |
2096 |
container_issue |
1 |
container_start_page |
257 |
op_container_end_page |
286 |
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1766143283648528384 |