Haplomesus angustus Hansen 1916
Haplomesus angustus Hansen, 1916 (Figs 13–14) Haplomesus angustus Hansen, 1916: 61 –62, pl. V, fig. 2 a–e; Gurjanova, 1932: 43, tabl. XIV, 50; 1933: 410; Gorbunov, 1946: 76 –77; Menzies, 1962: 119, fig. 20 A–D; Wolff, 1962: 86, 217, 262, 289; Gurjanova, 1964: 259; Kussakin, 1988: 454 –456, fig. 375....
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Online Access: | https://dx.doi.org/10.5281/zenodo.6256237 https://zenodo.org/record/6256237 |
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ftdatacite:10.5281/zenodo.6256237 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
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language |
unknown |
topic |
Biodiversity Taxonomy Animalia Arthropoda Malacostraca Isopoda Ischnomesidae Haplomesus Haplomesus angustus |
spellingShingle |
Biodiversity Taxonomy Animalia Arthropoda Malacostraca Isopoda Ischnomesidae Haplomesus Haplomesus angustus Kavanagh, Fiona A. Wilson, George D. F. Power, Anne Marie Haplomesus angustus Hansen 1916 |
topic_facet |
Biodiversity Taxonomy Animalia Arthropoda Malacostraca Isopoda Ischnomesidae Haplomesus Haplomesus angustus |
description |
Haplomesus angustus Hansen, 1916 (Figs 13–14) Haplomesus angustus Hansen, 1916: 61 –62, pl. V, fig. 2 a–e; Gurjanova, 1932: 43, tabl. XIV, 50; 1933: 410; Gorbunov, 1946: 76 –77; Menzies, 1962: 119, fig. 20 A–D; Wolff, 1962: 86, 217, 262, 289; Gurjanova, 1964: 259; Kussakin, 1988: 454 –456, fig. 375. Remarks on Type Material . The holotype male is in relatively good condition. The spines on pereonite 1, however, have been broken off since Hansen's original illustration. Hansen also designated a male paratype that he illustrated but did not describe. The paratype specimen is missing the head and anterior pereonites 1 and 2, but otherwise is in good condition. Pereonite 5 of the paratype is 4 times as long as wide, whereas the holotype has a ratio of five times as long as wide; this may be due to the smaller size of the paratype. A small difference in the posterolateral spines of the pleotelson may be attributed to slight damage of both specimens. Material examined . Holotype male 4.8 mm, ZMUC CRU 5338, Ingolf Station 18, south of Denmark Strait, 61 º 44 'N, 30 º 29 'W, 1135 Danish fathoms (2137 m). Paratype male 4 mm (estimated), ZMUC CRU 5338, Ingolf Station 125, 68º08'N, 16 º02'W, 729 Danish fathoms (1373 m). Diagnosis. Male with anterolateral spines on pereonite 1 only. Pereonite 7 length reduced, less than pereonite 6. Pleotelson posterolateral margin anterior to uropods with simple spines, length subequal to uropods. Antennula with 3 distal flagellar articles. Pereopod I carpus ventral margin with 1 proximal robust seta and 1 robust seta on palm. Pleopod I of male without simple setae on lateral or distal margins. Description of male (female unknown). Body length 4.8 mm. Head length 0.9 width. Head cuticular structure granulated; pereonite 7 length reduced, less than pereonite 6. Head lobe on ventrolateral margin absent in lateral view. Pereonite 1 width 0.1 total body length, anterolateral simple spines, short, length near pereonite 1 length, acutely pointed. Pereonite 5 length 5 width, 0.5 total body length. Pleotelson dorsal surface axial ridge weakly vaulted, separated from lateral fields only by shallow elongate concavities; Pleotelson length 1.4 width; posterolateral margin adjacent to uropods convex. Antennula and antenna . Antennula with 5 articles; article 2 length 0.6 head width, with 2 elongate ventromedial setae; distal articles in total small, shorter than article 2; article 3 cuticle smooth, length similar to article 4, elongate and tubular, much longer than wide; terminal article longer than penultimate article; aesthetascs absent, length 3.9 width. Mouthparts . Maxilliped palp article 3 wider than article 2. Pereopods . Pereopod I propodus ventral margin with 1 robust seta (see Hansen, 1916: pl. V, fig. 2 C). Pereopod VII absent in adults. Pleopods and uropods . Pleopod I distal tip with lateral horns. Uropods extending near posterior margin of pleotelson, length 0.2 length of pleotelson. Distribution . Northeast Atlantic Ocean, south of Denmark Strait; Arctic Ocean east of Greenland, 1333–2076 m. Remarks . The holotype of Haplomesus angustus Hansen, 1916 was considered by Hansen to be a juvenile male, due to the lack of pereopod VII. Hansen (1916: 64) estimated that a fully grown male of H. angustus would measure about 9–12 mm. This would be an unusually large specimen for a Haplomesus species, although H. gigas Birstein, 1960 is in this size range. Species described from the North East Atlantic generally range from 4–5 mm, similar to the holotype of H. angustus (4.3 mm, fig. 13 A). The type specimen is sexually mature. The first pleopods (Fig. 13 E) are fully developed, with lateral horns on the distal tips, in contrast to the rounded tips that would be expected in a juvenile specimen (Fig. 6 E). The seventh pereonite is also much reduced, as noted by Hansen, a feature seen in most species that lack a pereopod VII as adults. We can conclude that the holotype is not a juvenile but rather is an adult without expression of the seventh pereopod. H. angustus males are distinct from those of other ' 6 pereopod' group species by having only short (approximately as long as width basally) anterolateral spines on pereonite 1 only. H. corniculatus males have long (much longer than wide) anteriorlycurving robust anterolateral spines on pereonite 1. Other species also have anterolateral spines on pereonite 4, which are absent in H. angustus . : Published as part of Kavanagh, Fiona A., Wilson, George D. F. & Power, Anne Marie, 2006, Heterochrony in Haplomesus (Crustacea: Isopoda: Ischnomesidae): revision of two species and description of two new species, pp. 1-33 in Zootaxa 1120 on pages 21-24, DOI: 10.5281/zenodo.171687 : {"references": ["Hansen, H. J. (1916) Crustacea Malacostraca III (V). The order Isopoda. Danish Ingolf Expedition, 3, Bianco Luno, Copenhagen, 262 pp.", "Gurjanova, E. (1932) Tableaux analytiques de la faune de lURSS, publies par lInstitut Zoologique de lAcademie des Sciences. Les isopods des mers arctiques. Moscow 181 pp.", "Gorbunov, G. P. (1946) Bottom inhabitants of the Siberian shallow water and central parts of the North Polar Sea. Report of the Driftway Icebreaker \" G. Sedov \" 1937 - 1940, 3, 30 - 138.", "Menzies, R. J. (1962) The isopods of abyssal depths in the Atlantic Ocean. Vema Research Series, 1, 79 - 206.", "Wolff, T. (1962) The systematics and biology of bathyal and abyssal Isopoda asellota. Galathea Report, 6, 7 - 320.", "Gurjanova, E. (1964) Amphipod and isopod fauna in the Atlantic depression of the Arctic Basin. Trudy Institute of Arctic and Antarctic Scientific Investigations of the Central Board of the Hydrometeorological Service for the Council of Ministers of the USSR, 59, 255 - 314.", "Kussakin, O. G. (1988) Marine and brackish-water Crustacea (Isopoda) of cold and temperate waters of the Northern Hemisphere. 3. Suborder Asellota 1. Janiridae, Santiidae, Dendrotionidae, Munnidae, Haplomunnidae, Mesosignidae, Haploniscidae, Mictosomatidae, Ischnomesidae. Opredeliteli po Faune SSR, Akademiya Nauk, SSR, 152, 1 - 501.", "Birstein, J. A. (1960) The family Ischnomesidae (Crustacea, Isopoda, Asellota) in the north-western part of the Pacific and the problem of amphiboreal and bipolar distribution of the deep sea fauna. Zoologik Zhurnal SSSR, 39, 3 - 28."]} |
format |
Text |
author |
Kavanagh, Fiona A. Wilson, George D. F. Power, Anne Marie |
author_facet |
Kavanagh, Fiona A. Wilson, George D. F. Power, Anne Marie |
author_sort |
Kavanagh, Fiona A. |
title |
Haplomesus angustus Hansen 1916 |
title_short |
Haplomesus angustus Hansen 1916 |
title_full |
Haplomesus angustus Hansen 1916 |
title_fullStr |
Haplomesus angustus Hansen 1916 |
title_full_unstemmed |
Haplomesus angustus Hansen 1916 |
title_sort |
haplomesus angustus hansen 1916 |
publisher |
Zenodo |
publishDate |
2006 |
url |
https://dx.doi.org/10.5281/zenodo.6256237 https://zenodo.org/record/6256237 |
long_lat |
ENVELOPE(9.895,9.895,63.645,63.645) ENVELOPE(61.911,61.911,-73.437,-73.437) ENVELOPE(14.083,14.083,-69.367,-69.367) |
geographic |
Arctic Antarctic Arctic Ocean Greenland Pacific Seta Menzies Sedov |
geographic_facet |
Arctic Antarctic Arctic Ocean Greenland Pacific Seta Menzies Sedov |
genre |
Antarc* Antarctic Arctic Basin Arctic Arctic Ocean Arctique* Denmark Strait Greenland North East Atlantic Northeast Atlantic |
genre_facet |
Antarc* Antarctic Arctic Basin Arctic Arctic Ocean Arctique* Denmark Strait Greenland North East Atlantic Northeast Atlantic |
op_relation |
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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 |
op_rightsnorm |
CC0 |
op_doi |
https://doi.org/10.5281/zenodo.6256237 https://doi.org/10.5281/zenodo.171687 https://doi.org/10.5281/zenodo.171699 https://doi.org/10.5281/zenodo.171700 https://doi.org/10.5281/zenodo.171692 https://doi.org/10.5281/zenodo.6256238 |
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spelling |
ftdatacite:10.5281/zenodo.6256237 2023-05-15T14:06:38+02:00 Haplomesus angustus Hansen 1916 Kavanagh, Fiona A. Wilson, George D. F. Power, Anne Marie 2006 https://dx.doi.org/10.5281/zenodo.6256237 https://zenodo.org/record/6256237 unknown Zenodo http://publication.plazi.org/id/FF86830AFFB590447033922EFFD56D38 http://zoobank.org/754DA9F9-946D-46B9-909B-B302ECB2379C https://zenodo.org/communities/biosyslit https://dx.doi.org/10.5281/zenodo.171687 http://publication.plazi.org/id/FF86830AFFB590447033922EFFD56D38 https://dx.doi.org/10.5281/zenodo.171699 https://dx.doi.org/10.5281/zenodo.171700 https://dx.doi.org/10.5281/zenodo.171692 http://zoobank.org/754DA9F9-946D-46B9-909B-B302ECB2379C https://dx.doi.org/10.5281/zenodo.6256238 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 Ischnomesidae Haplomesus Haplomesus angustus article-journal ScholarlyArticle Taxonomic treatment Text 2006 ftdatacite https://doi.org/10.5281/zenodo.6256237 https://doi.org/10.5281/zenodo.171687 https://doi.org/10.5281/zenodo.171699 https://doi.org/10.5281/zenodo.171700 https://doi.org/10.5281/zenodo.171692 https://doi.org/10.5281/zenodo.6256238 2022-04-01T12:23:58Z Haplomesus angustus Hansen, 1916 (Figs 13–14) Haplomesus angustus Hansen, 1916: 61 –62, pl. V, fig. 2 a–e; Gurjanova, 1932: 43, tabl. XIV, 50; 1933: 410; Gorbunov, 1946: 76 –77; Menzies, 1962: 119, fig. 20 A–D; Wolff, 1962: 86, 217, 262, 289; Gurjanova, 1964: 259; Kussakin, 1988: 454 –456, fig. 375. Remarks on Type Material . The holotype male is in relatively good condition. The spines on pereonite 1, however, have been broken off since Hansen's original illustration. Hansen also designated a male paratype that he illustrated but did not describe. The paratype specimen is missing the head and anterior pereonites 1 and 2, but otherwise is in good condition. Pereonite 5 of the paratype is 4 times as long as wide, whereas the holotype has a ratio of five times as long as wide; this may be due to the smaller size of the paratype. A small difference in the posterolateral spines of the pleotelson may be attributed to slight damage of both specimens. Material examined . Holotype male 4.8 mm, ZMUC CRU 5338, Ingolf Station 18, south of Denmark Strait, 61 º 44 'N, 30 º 29 'W, 1135 Danish fathoms (2137 m). Paratype male 4 mm (estimated), ZMUC CRU 5338, Ingolf Station 125, 68º08'N, 16 º02'W, 729 Danish fathoms (1373 m). Diagnosis. Male with anterolateral spines on pereonite 1 only. Pereonite 7 length reduced, less than pereonite 6. Pleotelson posterolateral margin anterior to uropods with simple spines, length subequal to uropods. Antennula with 3 distal flagellar articles. Pereopod I carpus ventral margin with 1 proximal robust seta and 1 robust seta on palm. Pleopod I of male without simple setae on lateral or distal margins. Description of male (female unknown). Body length 4.8 mm. Head length 0.9 width. Head cuticular structure granulated; pereonite 7 length reduced, less than pereonite 6. Head lobe on ventrolateral margin absent in lateral view. Pereonite 1 width 0.1 total body length, anterolateral simple spines, short, length near pereonite 1 length, acutely pointed. Pereonite 5 length 5 width, 0.5 total body length. Pleotelson dorsal surface axial ridge weakly vaulted, separated from lateral fields only by shallow elongate concavities; Pleotelson length 1.4 width; posterolateral margin adjacent to uropods convex. Antennula and antenna . Antennula with 5 articles; article 2 length 0.6 head width, with 2 elongate ventromedial setae; distal articles in total small, shorter than article 2; article 3 cuticle smooth, length similar to article 4, elongate and tubular, much longer than wide; terminal article longer than penultimate article; aesthetascs absent, length 3.9 width. Mouthparts . Maxilliped palp article 3 wider than article 2. Pereopods . Pereopod I propodus ventral margin with 1 robust seta (see Hansen, 1916: pl. V, fig. 2 C). Pereopod VII absent in adults. Pleopods and uropods . Pleopod I distal tip with lateral horns. Uropods extending near posterior margin of pleotelson, length 0.2 length of pleotelson. Distribution . Northeast Atlantic Ocean, south of Denmark Strait; Arctic Ocean east of Greenland, 1333–2076 m. Remarks . The holotype of Haplomesus angustus Hansen, 1916 was considered by Hansen to be a juvenile male, due to the lack of pereopod VII. Hansen (1916: 64) estimated that a fully grown male of H. angustus would measure about 9–12 mm. This would be an unusually large specimen for a Haplomesus species, although H. gigas Birstein, 1960 is in this size range. Species described from the North East Atlantic generally range from 4–5 mm, similar to the holotype of H. angustus (4.3 mm, fig. 13 A). The type specimen is sexually mature. The first pleopods (Fig. 13 E) are fully developed, with lateral horns on the distal tips, in contrast to the rounded tips that would be expected in a juvenile specimen (Fig. 6 E). The seventh pereonite is also much reduced, as noted by Hansen, a feature seen in most species that lack a pereopod VII as adults. We can conclude that the holotype is not a juvenile but rather is an adult without expression of the seventh pereopod. H. angustus males are distinct from those of other ' 6 pereopod' group species by having only short (approximately as long as width basally) anterolateral spines on pereonite 1 only. H. corniculatus males have long (much longer than wide) anteriorlycurving robust anterolateral spines on pereonite 1. Other species also have anterolateral spines on pereonite 4, which are absent in H. angustus . : Published as part of Kavanagh, Fiona A., Wilson, George D. F. & Power, Anne Marie, 2006, Heterochrony in Haplomesus (Crustacea: Isopoda: Ischnomesidae): revision of two species and description of two new species, pp. 1-33 in Zootaxa 1120 on pages 21-24, DOI: 10.5281/zenodo.171687 : {"references": ["Hansen, H. J. (1916) Crustacea Malacostraca III (V). The order Isopoda. Danish Ingolf Expedition, 3, Bianco Luno, Copenhagen, 262 pp.", "Gurjanova, E. (1932) Tableaux analytiques de la faune de lURSS, publies par lInstitut Zoologique de lAcademie des Sciences. Les isopods des mers arctiques. Moscow 181 pp.", "Gorbunov, G. P. (1946) Bottom inhabitants of the Siberian shallow water and central parts of the North Polar Sea. Report of the Driftway Icebreaker \" G. Sedov \" 1937 - 1940, 3, 30 - 138.", "Menzies, R. J. (1962) The isopods of abyssal depths in the Atlantic Ocean. Vema Research Series, 1, 79 - 206.", "Wolff, T. (1962) The systematics and biology of bathyal and abyssal Isopoda asellota. Galathea Report, 6, 7 - 320.", "Gurjanova, E. (1964) Amphipod and isopod fauna in the Atlantic depression of the Arctic Basin. Trudy Institute of Arctic and Antarctic Scientific Investigations of the Central Board of the Hydrometeorological Service for the Council of Ministers of the USSR, 59, 255 - 314.", "Kussakin, O. G. (1988) Marine and brackish-water Crustacea (Isopoda) of cold and temperate waters of the Northern Hemisphere. 3. Suborder Asellota 1. Janiridae, Santiidae, Dendrotionidae, Munnidae, Haplomunnidae, Mesosignidae, Haploniscidae, Mictosomatidae, Ischnomesidae. Opredeliteli po Faune SSR, Akademiya Nauk, SSR, 152, 1 - 501.", "Birstein, J. A. (1960) The family Ischnomesidae (Crustacea, Isopoda, Asellota) in the north-western part of the Pacific and the problem of amphiboreal and bipolar distribution of the deep sea fauna. Zoologik Zhurnal SSSR, 39, 3 - 28."]} Text Antarc* Antarctic Arctic Basin Arctic Arctic Ocean Arctique* Denmark Strait Greenland North East Atlantic Northeast Atlantic DataCite Metadata Store (German National Library of Science and Technology) Arctic Antarctic Arctic Ocean Greenland Pacific Seta ENVELOPE(9.895,9.895,63.645,63.645) Menzies ENVELOPE(61.911,61.911,-73.437,-73.437) Sedov ENVELOPE(14.083,14.083,-69.367,-69.367) |