Redescription of Bythotrephes arcticus Lilljeborg, 1901 (Crustacea:Cladocera: Onychopoda) and confirmation of an independent species status of the distant Transcaucasian populations of the genus Bythotrephes Leydig
Two species of the genus Bythotrephes Leydig, B. arcticus Lilljeborg and B. transcaucasicus Behning, forming a group of close species, are redescribed on the basis of type material and other materials from Northern Eurasia. They were investigated with the application of detailed morphological analys...
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2016
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ftmagnoliapress:oai:https://mapress.com/oai/:article/17149 2023-10-09T21:56:21+02:00 Redescription of Bythotrephes arcticus Lilljeborg, 1901 (Crustacea:Cladocera: Onychopoda) and confirmation of an independent species status of the distant Transcaucasian populations of the genus Bythotrephes Leydig KOROVCHINSKY, NIKOLAI M. 2016-07-15 application/pdf https://www.mapress.com/zt/article/view/zootaxa.4138.2.2 eng eng Mangolia Press https://www.mapress.com/zt/article/view/zootaxa.4138.2.2/6899 https://www.mapress.com/zt/article/view/zootaxa.4138.2.2 Copyright (c) 2016 Magnolia press Zootaxa; Vol. 4138 No. 2: 15 Jul. 2016; 247–270 1175-5334 1175-5326 10.11646/zootaxa.4138.2 Crustacea taxonomic revision type material geographical distribution ice ages possible extinction info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2016 ftmagnoliapress https://doi.org/10.11646/zootaxa.4138.2 2023-09-19T17:26:22Z Two species of the genus Bythotrephes Leydig, B. arcticus Lilljeborg and B. transcaucasicus Behning, forming a group of close species, are redescribed on the basis of type material and other materials from Northern Eurasia. They were investigated with the application of detailed morphological analysis, including intra- and interpopulation variability and the original scheme of morphometric measurements. The lectotypes and paralectotypes of the species were selected. B. arcticus compared with other species of the genus, seem more evolutionary primitive and less specialized, judging from its large body size, comparatively short tl I, short and straight caudal process, well developed distal setae on two proximal endopodital segments of tl I, and large number of claws. B. arcticus tends to occur in small and shallow water bodies, while B. transcaucasicus was predominantly found in pelagic zone of large and deep Transcaucasian lakes. B. arcticus is probably mainly distributed along the tundra and northern forest area of the Eurasian continent and the nearest islands from Scandinavia to Eastern Siberia. Its documented easternmost locality is situated near the northern part of the Yenisei River, whereas B. transcaucasicus was recorded in the second half of 19th–first half of 20th century in three closely situated mountain lakes in Turkey, Georgia, and Armenia. The presence of B. arcticus in Northern Kazakhstan and B. transcaucasicus in the distant Transcaucasia is linked with their (or their ancestor) hypothetical displacement to the south in the period of ice ages. More recent surveys of Transcaucasian lakes have not revealed the presence of B. transcaucasicus. The rare findings of this species in the past can imply that it could also be missed in the process of collecting but, on the other hand, it cannot be excluded that B. transcaucasicus become extinct as a result of an anthropogenic or other impact on Transcaucasian lakes. Article in Journal/Newspaper Tundra Siberia Magnolia press Yenisei River ENVELOPE(84.738,84.738,69.718,69.718) Zootaxa 4138 2 |
institution |
Open Polar |
collection |
Magnolia press |
op_collection_id |
ftmagnoliapress |
language |
English |
topic |
Crustacea taxonomic revision type material geographical distribution ice ages possible extinction |
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Crustacea taxonomic revision type material geographical distribution ice ages possible extinction KOROVCHINSKY, NIKOLAI M. Redescription of Bythotrephes arcticus Lilljeborg, 1901 (Crustacea:Cladocera: Onychopoda) and confirmation of an independent species status of the distant Transcaucasian populations of the genus Bythotrephes Leydig |
topic_facet |
Crustacea taxonomic revision type material geographical distribution ice ages possible extinction |
description |
Two species of the genus Bythotrephes Leydig, B. arcticus Lilljeborg and B. transcaucasicus Behning, forming a group of close species, are redescribed on the basis of type material and other materials from Northern Eurasia. They were investigated with the application of detailed morphological analysis, including intra- and interpopulation variability and the original scheme of morphometric measurements. The lectotypes and paralectotypes of the species were selected. B. arcticus compared with other species of the genus, seem more evolutionary primitive and less specialized, judging from its large body size, comparatively short tl I, short and straight caudal process, well developed distal setae on two proximal endopodital segments of tl I, and large number of claws. B. arcticus tends to occur in small and shallow water bodies, while B. transcaucasicus was predominantly found in pelagic zone of large and deep Transcaucasian lakes. B. arcticus is probably mainly distributed along the tundra and northern forest area of the Eurasian continent and the nearest islands from Scandinavia to Eastern Siberia. Its documented easternmost locality is situated near the northern part of the Yenisei River, whereas B. transcaucasicus was recorded in the second half of 19th–first half of 20th century in three closely situated mountain lakes in Turkey, Georgia, and Armenia. The presence of B. arcticus in Northern Kazakhstan and B. transcaucasicus in the distant Transcaucasia is linked with their (or their ancestor) hypothetical displacement to the south in the period of ice ages. More recent surveys of Transcaucasian lakes have not revealed the presence of B. transcaucasicus. The rare findings of this species in the past can imply that it could also be missed in the process of collecting but, on the other hand, it cannot be excluded that B. transcaucasicus become extinct as a result of an anthropogenic or other impact on Transcaucasian lakes. |
format |
Article in Journal/Newspaper |
author |
KOROVCHINSKY, NIKOLAI M. |
author_facet |
KOROVCHINSKY, NIKOLAI M. |
author_sort |
KOROVCHINSKY, NIKOLAI M. |
title |
Redescription of Bythotrephes arcticus Lilljeborg, 1901 (Crustacea:Cladocera: Onychopoda) and confirmation of an independent species status of the distant Transcaucasian populations of the genus Bythotrephes Leydig |
title_short |
Redescription of Bythotrephes arcticus Lilljeborg, 1901 (Crustacea:Cladocera: Onychopoda) and confirmation of an independent species status of the distant Transcaucasian populations of the genus Bythotrephes Leydig |
title_full |
Redescription of Bythotrephes arcticus Lilljeborg, 1901 (Crustacea:Cladocera: Onychopoda) and confirmation of an independent species status of the distant Transcaucasian populations of the genus Bythotrephes Leydig |
title_fullStr |
Redescription of Bythotrephes arcticus Lilljeborg, 1901 (Crustacea:Cladocera: Onychopoda) and confirmation of an independent species status of the distant Transcaucasian populations of the genus Bythotrephes Leydig |
title_full_unstemmed |
Redescription of Bythotrephes arcticus Lilljeborg, 1901 (Crustacea:Cladocera: Onychopoda) and confirmation of an independent species status of the distant Transcaucasian populations of the genus Bythotrephes Leydig |
title_sort |
redescription of bythotrephes arcticus lilljeborg, 1901 (crustacea:cladocera: onychopoda) and confirmation of an independent species status of the distant transcaucasian populations of the genus bythotrephes leydig |
publisher |
Mangolia Press |
publishDate |
2016 |
url |
https://www.mapress.com/zt/article/view/zootaxa.4138.2.2 |
long_lat |
ENVELOPE(84.738,84.738,69.718,69.718) |
geographic |
Yenisei River |
geographic_facet |
Yenisei River |
genre |
Tundra Siberia |
genre_facet |
Tundra Siberia |
op_source |
Zootaxa; Vol. 4138 No. 2: 15 Jul. 2016; 247–270 1175-5334 1175-5326 10.11646/zootaxa.4138.2 |
op_relation |
https://www.mapress.com/zt/article/view/zootaxa.4138.2.2/6899 https://www.mapress.com/zt/article/view/zootaxa.4138.2.2 |
op_rights |
Copyright (c) 2016 Magnolia press |
op_doi |
https://doi.org/10.11646/zootaxa.4138.2 |
container_title |
Zootaxa |
container_volume |
4138 |
container_issue |
2 |
_version_ |
1779321007796912128 |