Pseudarachna Sars 1897
Pseudarachna Sars, 1897 Mesostenus Sars, 1864: partim: 9 (preoccupied). Pseudarachna . — Sars, 1897: 142.— Nierstrasz & Schuurmans-Stekhoven, 1930: 129.— Kussakin, 2003: 261. Not Pseudarachna . — Schultz, 1976: 13. Type species: Mesostenus hirsutus Sars, 1864; by monotypy. Diagnosis Cephalic fro...
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Online Access: | https://dx.doi.org/10.5281/zenodo.6257034 https://zenodo.org/record/6257034 |
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DataCite Metadata Store (German National Library of Science and Technology) |
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Biodiversity Taxonomy Animalia Arthropoda Malacostraca Isopoda Munnopsidae Pseudarachna |
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Biodiversity Taxonomy Animalia Arthropoda Malacostraca Isopoda Munnopsidae Pseudarachna Merrin, Kelly L. Pseudarachna Sars 1897 |
topic_facet |
Biodiversity Taxonomy Animalia Arthropoda Malacostraca Isopoda Munnopsidae Pseudarachna |
description |
Pseudarachna Sars, 1897 Mesostenus Sars, 1864: partim: 9 (preoccupied). Pseudarachna . — Sars, 1897: 142.— Nierstrasz & Schuurmans-Stekhoven, 1930: 129.— Kussakin, 2003: 261. Not Pseudarachna . — Schultz, 1976: 13. Type species: Mesostenus hirsutus Sars, 1864; by monotypy. Diagnosis Cephalic frons enlarged, broad, semi-circular, without defined ridge around antennae; cephalon anterior flanges absent. Pereonites 1–4 not short or compact, dorsal spines present, apical setae present. Pereonite 2 largest; pereonites 5–7, lateral margins not narrow, natasome not reduced. Pleon anterolateral margins rounded, without spine. Antennae positioned widely apart; antenna 1 small, article 1 with lateral flange; antenna 2 article 1 with no anterolateral spine. Mandible lacinia mobilis, spine row and palp all absent; mandibular fossa angular, sub-horizontal across mandible. Pereopod 2 elongate, robust; ischium compact, wider than other articles; pereopods 5 and 6 ischium superior margin with plumose setae; carpus paddle shaped; carpus and propodus with marginal plumose setae; pereopod 7 more ambulatory, with setation similar to that of pereopods 5 and 6; dactyli of natatory pereopods flattened, slightly broadened. Pleopod 4 exopod with more than 1 plumose seta. Pleon triangular, domed in centre. Operculum partially vaulted, with small medial keel. Pleopod 5 simple lobe. Uropods flat, uniramous. Remarks Pseudarachna has many unique apomorphies, the most notable being the enlarged, semi-circular shaped cephalic frons, the widely spaced antennae, the small antenna 1, enlarged pereonite 2 and a robust and enlarged pereopod 2 with a wide, compact ischium. Pseudarachna is easily distinguished by these characters from other closely related genera such as Ilyarachna Sars, 1870 and Echinozone Sars, 1897. Males are not known for this genus, and thus there is no data specific on sexual dimorphism. Distribution In the North Atlantic, from western Ireland to Denmark (Wolff 1962) at depths between 50–478 metres (Svavarsson et al . 1993); off eastern Australia at approximately 36 ° south and, Bass Strait at 38 ° south off Point Hicks (both records of undescribed mancas) at depths between 960–1277 metres; and the Challenger Plateau, west of the South Island, New Zealand at depths between 1005–1463 metres. : Published as part of Merrin, Kelly L., 2006, The first record of the crustacean isopod genus Pseudarachna Sars, 1897 (Isopoda: Asellota: Munnopsidae) from the Southern Hemisphere, with description of a new species from New Zealand, pp. 59-68 in Zootaxa 1370 on pages 60-61, DOI: 10.5281/zenodo.174907 : {"references": ["Sars, G. O. (1897) Isopoda. Part VII, VIII. Desmosomidae, Munnopsidae. (Bergen Museum: Bergen, Norway), 117 - 144.", "Sars, G. O. (1864) Om en anomal Gruppe af Isopoder. Forhandlinger i Videnskabs-Selskabet i Kristiania, 1863, 205 - 221.", "Nierstrasz, H. F. & Schuurmans-Stekhoven Jr, J. H. (1930) Isopoda genuina. Die Tierwelt der Nord- und Ostsee X. e 2, 57 - 133.", "Kussakin, O. G. (2003) Marine and brackishwater likefooted Crustacea (Isopoda) from the cold and temperate waters of the Northern Hemisphere. Suborder Asellota. Part 3 Munnopsidae (in Russian). (Izdatel'stvo Nauka: Leningrad), 380 pp.", "Schultz, G. A. (1976) Species of Asellotes (Isopoda: Paraselloidea) from Anvers Island, Antarctica. In: Biology of the Antarctic Seas VI. Antarctic Research Series 26, 1 - 35.", "Sars, G. O. (1870) Nye Dybuandscrustaceer fra Lofoten. Forhandlinger i Videnskabs-Selskabet i Kristiania, 1869, 145 - 286.", "Wolff, T. (1962) The systematics and biology of bathyal and abyssal Isopoda Asellota. Galathea Report, 6, 1 - 320.", "Svavarsson, J., Stromberg, J. O., & Brattegard, T. (1993) The deep-sea asellotes (Isopoda, Crustacea) fauna of the northern seas: species composition, distributional patterns and origin. Journal of Biogeography, 20, 537 - 555."]} |
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Text |
author |
Merrin, Kelly L. |
author_facet |
Merrin, Kelly L. |
author_sort |
Merrin, Kelly L. |
title |
Pseudarachna Sars 1897 |
title_short |
Pseudarachna Sars 1897 |
title_full |
Pseudarachna Sars 1897 |
title_fullStr |
Pseudarachna Sars 1897 |
title_full_unstemmed |
Pseudarachna Sars 1897 |
title_sort |
pseudarachna sars 1897 |
publisher |
Zenodo |
publishDate |
2006 |
url |
https://dx.doi.org/10.5281/zenodo.6257034 https://zenodo.org/record/6257034 |
long_lat |
ENVELOPE(9.895,9.895,63.645,63.645) ENVELOPE(-63.500,-63.500,-64.600,-64.600) ENVELOPE(-63.500,-63.500,-64.600,-64.600) ENVELOPE(64.763,64.763,-71.144,-71.144) ENVELOPE(9.795,9.795,62.990,62.990) |
geographic |
Antarctic The Antarctic Lofoten Norway New Zealand Bergen Seta Anvers Anvers Island Hicks Fossa |
geographic_facet |
Antarctic The Antarctic Lofoten Norway New Zealand Bergen Seta Anvers Anvers Island Hicks Fossa |
genre |
Antarc* Antarctic Antarctica Anvers Island Lofoten North Atlantic |
genre_facet |
Antarc* Antarctic Antarctica Anvers Island Lofoten North Atlantic |
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http://publication.plazi.org/id/FF85D20A4D48BA56FFCFFFA24D1CB04B http://zoobank.org/61F11318-6791-472B-A65E-7E06199E1C78 https://zenodo.org/communities/biosyslit https://dx.doi.org/10.5281/zenodo.174907 http://publication.plazi.org/id/FF85D20A4D48BA56FFCFFFA24D1CB04B http://zoobank.org/61F11318-6791-472B-A65E-7E06199E1C78 https://dx.doi.org/10.5281/zenodo.6257033 https://zenodo.org/communities/biosyslit |
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Open Access Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode cc0-1.0 info:eu-repo/semantics/openAccess |
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CC0 |
op_doi |
https://doi.org/10.5281/zenodo.6257034 https://doi.org/10.5281/zenodo.174907 https://doi.org/10.5281/zenodo.6257033 |
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1766278641914740736 |
spelling |
ftdatacite:10.5281/zenodo.6257034 2023-05-15T14:06:38+02:00 Pseudarachna Sars 1897 Merrin, Kelly L. 2006 https://dx.doi.org/10.5281/zenodo.6257034 https://zenodo.org/record/6257034 unknown Zenodo http://publication.plazi.org/id/FF85D20A4D48BA56FFCFFFA24D1CB04B http://zoobank.org/61F11318-6791-472B-A65E-7E06199E1C78 https://zenodo.org/communities/biosyslit https://dx.doi.org/10.5281/zenodo.174907 http://publication.plazi.org/id/FF85D20A4D48BA56FFCFFFA24D1CB04B http://zoobank.org/61F11318-6791-472B-A65E-7E06199E1C78 https://dx.doi.org/10.5281/zenodo.6257033 https://zenodo.org/communities/biosyslit Open Access Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode cc0-1.0 info:eu-repo/semantics/openAccess CC0 Biodiversity Taxonomy Animalia Arthropoda Malacostraca Isopoda Munnopsidae Pseudarachna article-journal ScholarlyArticle Taxonomic treatment Text 2006 ftdatacite https://doi.org/10.5281/zenodo.6257034 https://doi.org/10.5281/zenodo.174907 https://doi.org/10.5281/zenodo.6257033 2022-04-01T12:23:58Z Pseudarachna Sars, 1897 Mesostenus Sars, 1864: partim: 9 (preoccupied). Pseudarachna . — Sars, 1897: 142.— Nierstrasz & Schuurmans-Stekhoven, 1930: 129.— Kussakin, 2003: 261. Not Pseudarachna . — Schultz, 1976: 13. Type species: Mesostenus hirsutus Sars, 1864; by monotypy. Diagnosis Cephalic frons enlarged, broad, semi-circular, without defined ridge around antennae; cephalon anterior flanges absent. Pereonites 1–4 not short or compact, dorsal spines present, apical setae present. Pereonite 2 largest; pereonites 5–7, lateral margins not narrow, natasome not reduced. Pleon anterolateral margins rounded, without spine. Antennae positioned widely apart; antenna 1 small, article 1 with lateral flange; antenna 2 article 1 with no anterolateral spine. Mandible lacinia mobilis, spine row and palp all absent; mandibular fossa angular, sub-horizontal across mandible. Pereopod 2 elongate, robust; ischium compact, wider than other articles; pereopods 5 and 6 ischium superior margin with plumose setae; carpus paddle shaped; carpus and propodus with marginal plumose setae; pereopod 7 more ambulatory, with setation similar to that of pereopods 5 and 6; dactyli of natatory pereopods flattened, slightly broadened. Pleopod 4 exopod with more than 1 plumose seta. Pleon triangular, domed in centre. Operculum partially vaulted, with small medial keel. Pleopod 5 simple lobe. Uropods flat, uniramous. Remarks Pseudarachna has many unique apomorphies, the most notable being the enlarged, semi-circular shaped cephalic frons, the widely spaced antennae, the small antenna 1, enlarged pereonite 2 and a robust and enlarged pereopod 2 with a wide, compact ischium. Pseudarachna is easily distinguished by these characters from other closely related genera such as Ilyarachna Sars, 1870 and Echinozone Sars, 1897. Males are not known for this genus, and thus there is no data specific on sexual dimorphism. Distribution In the North Atlantic, from western Ireland to Denmark (Wolff 1962) at depths between 50–478 metres (Svavarsson et al . 1993); off eastern Australia at approximately 36 ° south and, Bass Strait at 38 ° south off Point Hicks (both records of undescribed mancas) at depths between 960–1277 metres; and the Challenger Plateau, west of the South Island, New Zealand at depths between 1005–1463 metres. : Published as part of Merrin, Kelly L., 2006, The first record of the crustacean isopod genus Pseudarachna Sars, 1897 (Isopoda: Asellota: Munnopsidae) from the Southern Hemisphere, with description of a new species from New Zealand, pp. 59-68 in Zootaxa 1370 on pages 60-61, DOI: 10.5281/zenodo.174907 : {"references": ["Sars, G. O. (1897) Isopoda. Part VII, VIII. Desmosomidae, Munnopsidae. (Bergen Museum: Bergen, Norway), 117 - 144.", "Sars, G. O. (1864) Om en anomal Gruppe af Isopoder. Forhandlinger i Videnskabs-Selskabet i Kristiania, 1863, 205 - 221.", "Nierstrasz, H. F. & Schuurmans-Stekhoven Jr, J. H. (1930) Isopoda genuina. Die Tierwelt der Nord- und Ostsee X. e 2, 57 - 133.", "Kussakin, O. G. (2003) Marine and brackishwater likefooted Crustacea (Isopoda) from the cold and temperate waters of the Northern Hemisphere. Suborder Asellota. Part 3 Munnopsidae (in Russian). (Izdatel'stvo Nauka: Leningrad), 380 pp.", "Schultz, G. A. (1976) Species of Asellotes (Isopoda: Paraselloidea) from Anvers Island, Antarctica. In: Biology of the Antarctic Seas VI. Antarctic Research Series 26, 1 - 35.", "Sars, G. O. (1870) Nye Dybuandscrustaceer fra Lofoten. Forhandlinger i Videnskabs-Selskabet i Kristiania, 1869, 145 - 286.", "Wolff, T. (1962) The systematics and biology of bathyal and abyssal Isopoda Asellota. Galathea Report, 6, 1 - 320.", "Svavarsson, J., Stromberg, J. O., & Brattegard, T. (1993) The deep-sea asellotes (Isopoda, Crustacea) fauna of the northern seas: species composition, distributional patterns and origin. Journal of Biogeography, 20, 537 - 555."]} Text Antarc* Antarctic Antarctica Anvers Island Lofoten North Atlantic DataCite Metadata Store (German National Library of Science and Technology) Antarctic The Antarctic Lofoten Norway New Zealand Bergen Seta ENVELOPE(9.895,9.895,63.645,63.645) Anvers ENVELOPE(-63.500,-63.500,-64.600,-64.600) Anvers Island ENVELOPE(-63.500,-63.500,-64.600,-64.600) Hicks ENVELOPE(64.763,64.763,-71.144,-71.144) Fossa ENVELOPE(9.795,9.795,62.990,62.990) |