The taxonomic challenge posed by the Antarctic echinoids Abatus bidens and Abatus cavernosus (Schizasteridae, Echinoidea)
Cryptic species have been repeatedly described for two decades among the Antarctic fauna, challenging the classic model of Antarctic species with circumpolar distributions and leading to revisit the richness of the Antarctic fauna. No cryptic species had been so far recorded among Antarctic echinoid...
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ftunivbruxelles:oai:dipot.ulb.ac.be:2013/229569 2023-05-15T13:50:15+02:00 The taxonomic challenge posed by the Antarctic echinoids Abatus bidens and Abatus cavernosus (Schizasteridae, Echinoidea) David, Bruno Saucède, Thomas Chenuil, Anne Steimetz, Emilie De Ridder, Chantal 2016 No full-text files http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/229569 fr fre uri/info:doi/10.1007/s00300-015-1842-5 uri/info:scp/84948986186 http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/229569 Polar biology, 39 Sciences exactes et naturelles Abatus bidens Abatus cavernosus Cryptic species Echinoidea Schizasteridae Southern Ocean info:eu-repo/semantics/article info:ulb-repo/semantics/articlePeerReview info:ulb-repo/semantics/openurl/article 2016 ftunivbruxelles 2022-06-12T21:30:14Z Cryptic species have been repeatedly described for two decades among the Antarctic fauna, challenging the classic model of Antarctic species with circumpolar distributions and leading to revisit the richness of the Antarctic fauna. No cryptic species had been so far recorded among Antarctic echinoids, which are, however, relatively well diversified in the Southern Ocean. The R/V Polarstern cruise PS81 (ANT XXIX/3) came across populations of Abatus bidens, a schizasterid so far known by few specimens that were found living in sympatry with the species Abatus cavernosus. The species A. cavernosus is reported to have a circum-Antarctic distribution, while A. bidens is only recorded with certainty in South Georgia and at the northern tip of the Antarctic Peninsula. Based on genetic and morphological analyses, our results clearly show that A. bidens and A. cavernosus are two distinct species. The analyzed specimens of A. bidens group together in two haplogroups separated from one another by 2.7 % of nucleotide differences. They are located in the Weddell Sea and in the Bransfield Strait. Specimens of A. cavernosus form one single haplogroup separated from haplogroups of A. bidens by 5 and 3.5 % of nucleotide differences, respectively. The species was collected in the Drake Passage and in the Bransfield Strait. Morphological analyses differentiate A. bidens from A. cavernosus. In contrast, the two genetic groups of A.bidens cannot be differentiated from one another based on morphology alone, suggesting that they may represent a case of cryptic species, common in many Antarctic taxa, but not yet reported in Antarctic echinoids. This needs to be confirmed by complementary analyses of independent genetic markers. SCOPUS: ar.j info:eu-repo/semantics/published Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Bransfield Strait Drake Passage Polar Biology Southern Ocean Weddell Sea DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) Antarctic Antarctic Peninsula Bransfield Strait Drake Passage Southern Ocean The Antarctic Weddell Weddell Sea |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
French |
topic |
Sciences exactes et naturelles Abatus bidens Abatus cavernosus Cryptic species Echinoidea Schizasteridae Southern Ocean |
spellingShingle |
Sciences exactes et naturelles Abatus bidens Abatus cavernosus Cryptic species Echinoidea Schizasteridae Southern Ocean David, Bruno Saucède, Thomas Chenuil, Anne Steimetz, Emilie De Ridder, Chantal The taxonomic challenge posed by the Antarctic echinoids Abatus bidens and Abatus cavernosus (Schizasteridae, Echinoidea) |
topic_facet |
Sciences exactes et naturelles Abatus bidens Abatus cavernosus Cryptic species Echinoidea Schizasteridae Southern Ocean |
description |
Cryptic species have been repeatedly described for two decades among the Antarctic fauna, challenging the classic model of Antarctic species with circumpolar distributions and leading to revisit the richness of the Antarctic fauna. No cryptic species had been so far recorded among Antarctic echinoids, which are, however, relatively well diversified in the Southern Ocean. The R/V Polarstern cruise PS81 (ANT XXIX/3) came across populations of Abatus bidens, a schizasterid so far known by few specimens that were found living in sympatry with the species Abatus cavernosus. The species A. cavernosus is reported to have a circum-Antarctic distribution, while A. bidens is only recorded with certainty in South Georgia and at the northern tip of the Antarctic Peninsula. Based on genetic and morphological analyses, our results clearly show that A. bidens and A. cavernosus are two distinct species. The analyzed specimens of A. bidens group together in two haplogroups separated from one another by 2.7 % of nucleotide differences. They are located in the Weddell Sea and in the Bransfield Strait. Specimens of A. cavernosus form one single haplogroup separated from haplogroups of A. bidens by 5 and 3.5 % of nucleotide differences, respectively. The species was collected in the Drake Passage and in the Bransfield Strait. Morphological analyses differentiate A. bidens from A. cavernosus. In contrast, the two genetic groups of A.bidens cannot be differentiated from one another based on morphology alone, suggesting that they may represent a case of cryptic species, common in many Antarctic taxa, but not yet reported in Antarctic echinoids. This needs to be confirmed by complementary analyses of independent genetic markers. SCOPUS: ar.j info:eu-repo/semantics/published |
format |
Article in Journal/Newspaper |
author |
David, Bruno Saucède, Thomas Chenuil, Anne Steimetz, Emilie De Ridder, Chantal |
author_facet |
David, Bruno Saucède, Thomas Chenuil, Anne Steimetz, Emilie De Ridder, Chantal |
author_sort |
David, Bruno |
title |
The taxonomic challenge posed by the Antarctic echinoids Abatus bidens and Abatus cavernosus (Schizasteridae, Echinoidea) |
title_short |
The taxonomic challenge posed by the Antarctic echinoids Abatus bidens and Abatus cavernosus (Schizasteridae, Echinoidea) |
title_full |
The taxonomic challenge posed by the Antarctic echinoids Abatus bidens and Abatus cavernosus (Schizasteridae, Echinoidea) |
title_fullStr |
The taxonomic challenge posed by the Antarctic echinoids Abatus bidens and Abatus cavernosus (Schizasteridae, Echinoidea) |
title_full_unstemmed |
The taxonomic challenge posed by the Antarctic echinoids Abatus bidens and Abatus cavernosus (Schizasteridae, Echinoidea) |
title_sort |
taxonomic challenge posed by the antarctic echinoids abatus bidens and abatus cavernosus (schizasteridae, echinoidea) |
publishDate |
2016 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/229569 |
geographic |
Antarctic Antarctic Peninsula Bransfield Strait Drake Passage Southern Ocean The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic Antarctic Peninsula Bransfield Strait Drake Passage Southern Ocean The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctic Peninsula Bransfield Strait Drake Passage Polar Biology Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Bransfield Strait Drake Passage Polar Biology Southern Ocean Weddell Sea |
op_source |
Polar biology, 39 |
op_relation |
uri/info:doi/10.1007/s00300-015-1842-5 uri/info:scp/84948986186 http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/229569 |
_version_ |
1766253284247470080 |