Haploniscus unicornis Brökeland, 2010, n. sp.
Haploniscus unicornis complex Composition: Haploniscus unicornis Menzies, 1956; H. aduncus Lincoln, 1985 b; H. bihastatus n. sp. H. monoceros n. sp. H. machairis n. sp. H. angolensis n. sp. TABLE 1. DIVA stations, where specimens were sampled, EBS, multicorer (MUC) and boxcorer (GBC) deployments. Di...
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Online Access: | https://dx.doi.org/10.5281/zenodo.6209451 https://zenodo.org/record/6209451 |
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openpolar |
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Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
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unknown |
topic |
Biodiversity Taxonomy Animalia Arthropoda Malacostraca Isopoda Haploniscidae Haploniscus Haploniscus unicornis |
spellingShingle |
Biodiversity Taxonomy Animalia Arthropoda Malacostraca Isopoda Haploniscidae Haploniscus Haploniscus unicornis Brökeland, Wiebke Haploniscus unicornis Brökeland, 2010, n. sp. |
topic_facet |
Biodiversity Taxonomy Animalia Arthropoda Malacostraca Isopoda Haploniscidae Haploniscus Haploniscus unicornis |
description |
Haploniscus unicornis complex Composition: Haploniscus unicornis Menzies, 1956; H. aduncus Lincoln, 1985 b; H. bihastatus n. sp. H. monoceros n. sp. H. machairis n. sp. H. angolensis n. sp. TABLE 1. DIVA stations, where specimens were sampled, EBS, multicorer (MUC) and boxcorer (GBC) deployments. Diagnosis. Body oval, length at least 2.6 width. Head with conspicuous rostrum; rostrum triangular in dorsal view, anterior tip curved dorsally, acute, dorsal margin almost straight basally in males, strongly concave in females. Sutures between pereonites 5–7 and pleotelson visible in males, less distinct in females. Pleotelson processes large in males, distinctly smaller in females. Body surface (Fig. 2, details) covered by small depressions, merging into fine ridges on the surface of pleotelson. Antenna 1 article 1 slender, but wider than article 2. Flagellum in adult males and females with 4 articles. Antenna 2 dorsal tooth of article 3 somewhat shorter than article width, with 2 setae. Mandibular palp article 3 with 6 denticulate setae. Surface of carpus, propodus and dactylus covered with curved cuticular combs. Lateral apical combs of carpus setose, and in pereopods 2–7 of different size, outer comb slightly larger; additionally a slightly spinose dorsal comb. Dactylus accessory claw minute or absent. Pleopod 1 lateral margins of neck (narrowest part) with two setae each; distal margins undulating; distal setae of each side divided into a lateral group of 3–4 closely spaced shorter setae and a medial group of 3 widely spaced longer setae. Pleopod 2 endopod extending beyond distal margin of protopod, article 1 flexed slightly outwards, basal sperm chamber with at least one internal strut. Pleopod 3 outer plumose seta longest, exopod with 1 simple seta distally. Remarks. Species of the Haploniscus unicornis complex can be recognized by their characteristic rostrum, which is triangular in dorsal view and has a typical sickle-shape in lateral view, especially in females. The Haploniscus unicornis complex belongs to a group of Haploniscus species (including also H. bicuspis (Sars, 1877) and H. spinifer Hansen, 1916), which is closely related to Mastigoniscus . This group of Haploniscus species shares some important characters with species of Mastigoniscus . These include the trend towards the elongation of the endopod of pleopod 2 in males and the setation of the pereopods, especially the lack of sensory setae (described as“sensory spines” in Brandt 1988), the ornamentation of the pereopods, especially the dorsal comb on the apical carpus, and the reduction of the accessory claw. Similarities also exist in the antennae and the somewhat flattened body shape, although these may be also found in other Haploniscus species. Yet, Mastigoniscus species lack a rostrum, contrary to the Haploniscus unicornis complex and also H. bicuspis , which has a small and inconspicuous rostrum. All these species share the pronounced sexual dimorphism. Therefore allocation of juveniles and females to a species, that is well defined by its adult males can be difficult within the whole group, especially since the distinguishing characters are largely restricted to the habitus and pleopods 1 and 2 of the males. The setation of the pereopods is rather conserved within Mastigoniscus and related species and distinguishing characters in the mouthparts are nearly absent within the whole family. : Published as part of Brökeland, Wiebke, 2010, Description of four new species from the Haploniscus unicornis Menzies, 1956 complex (Isopoda: Asellota: Haploniscidae), pp. 1-35 in Zootaxa 2536 on pages 3-4, DOI: 10.5281/zenodo.196630 : {"references": ["Menzies, R. J. (1956) New abyssal tropical Atlantic isopods, with observations on their biology. American Museum Novitates, 1798, 1 - 16.", "Lincoln, R. J. (1985 b) Deep-sea asellote isopods of the north-east Atlantic: the family Haploniscidae. Journal of Natural History, 19, 655 - 695.", "Sars, G. O. (1877) Prodromus descriptionis crustaceorum ft pycnogonidarum, quae in expeditione norvegica anno 1876, observavit G. O. Sars. Archiv for Mathematik og Naturvidenskab, Kristiania (Oslo), 2, 337 - 371.", "Hansen, H. J. (1916) Crustacea Malacostraca III. The order Isopoda. Danish Ingolf Expedition, 3 (5), 1 - 262.", "Brandt, A. (1988) Morphology and ultrastructure of the sensory spine, a presumed mechanoreceptor of Sphaeroma hookeri (Crustacea, Isopoda), and remarks on similar spines in other peracarids. Journal of Morphology, 198, 219 - 229."]} |
format |
Text |
author |
Brökeland, Wiebke |
author_facet |
Brökeland, Wiebke |
author_sort |
Brökeland, Wiebke |
title |
Haploniscus unicornis Brökeland, 2010, n. sp. |
title_short |
Haploniscus unicornis Brökeland, 2010, n. sp. |
title_full |
Haploniscus unicornis Brökeland, 2010, n. sp. |
title_fullStr |
Haploniscus unicornis Brökeland, 2010, n. sp. |
title_full_unstemmed |
Haploniscus unicornis Brökeland, 2010, n. sp. |
title_sort |
haploniscus unicornis brökeland, 2010, n. sp. |
publisher |
Zenodo |
publishDate |
2010 |
url |
https://dx.doi.org/10.5281/zenodo.6209451 https://zenodo.org/record/6209451 |
long_lat |
ENVELOPE(-79.150,-79.150,-73.483,-73.483) ENVELOPE(61.911,61.911,-73.437,-73.437) ENVELOPE(9.895,9.895,63.645,63.645) ENVELOPE(-66.783,-66.783,-68.867,-68.867) |
geographic |
Combs Menzies Seta Sickle |
geographic_facet |
Combs Menzies Seta Sickle |
genre |
North East Atlantic |
genre_facet |
North East Atlantic |
op_relation |
http://publication.plazi.org/id/FFE809421C2C92249A7FFFDA7D794543 https://zenodo.org/communities/biosyslit https://dx.doi.org/10.5281/zenodo.196630 http://publication.plazi.org/id/FFE809421C2C92249A7FFFDA7D794543 https://dx.doi.org/10.5281/zenodo.196632 https://dx.doi.org/10.5281/zenodo.6209450 https://zenodo.org/communities/biosyslit |
op_rights |
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.6209451 https://doi.org/10.5281/zenodo.196630 https://doi.org/10.5281/zenodo.196632 https://doi.org/10.5281/zenodo.6209450 |
_version_ |
1766139474190794752 |
spelling |
ftdatacite:10.5281/zenodo.6209451 2023-05-15T17:38:50+02:00 Haploniscus unicornis Brökeland, 2010, n. sp. Brökeland, Wiebke 2010 https://dx.doi.org/10.5281/zenodo.6209451 https://zenodo.org/record/6209451 unknown Zenodo http://publication.plazi.org/id/FFE809421C2C92249A7FFFDA7D794543 https://zenodo.org/communities/biosyslit https://dx.doi.org/10.5281/zenodo.196630 http://publication.plazi.org/id/FFE809421C2C92249A7FFFDA7D794543 https://dx.doi.org/10.5281/zenodo.196632 https://dx.doi.org/10.5281/zenodo.6209450 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 Haploniscidae Haploniscus Haploniscus unicornis article-journal ScholarlyArticle Taxonomic treatment Text 2010 ftdatacite https://doi.org/10.5281/zenodo.6209451 https://doi.org/10.5281/zenodo.196630 https://doi.org/10.5281/zenodo.196632 https://doi.org/10.5281/zenodo.6209450 2022-04-01T11:50:50Z Haploniscus unicornis complex Composition: Haploniscus unicornis Menzies, 1956; H. aduncus Lincoln, 1985 b; H. bihastatus n. sp. H. monoceros n. sp. H. machairis n. sp. H. angolensis n. sp. TABLE 1. DIVA stations, where specimens were sampled, EBS, multicorer (MUC) and boxcorer (GBC) deployments. Diagnosis. Body oval, length at least 2.6 width. Head with conspicuous rostrum; rostrum triangular in dorsal view, anterior tip curved dorsally, acute, dorsal margin almost straight basally in males, strongly concave in females. Sutures between pereonites 5–7 and pleotelson visible in males, less distinct in females. Pleotelson processes large in males, distinctly smaller in females. Body surface (Fig. 2, details) covered by small depressions, merging into fine ridges on the surface of pleotelson. Antenna 1 article 1 slender, but wider than article 2. Flagellum in adult males and females with 4 articles. Antenna 2 dorsal tooth of article 3 somewhat shorter than article width, with 2 setae. Mandibular palp article 3 with 6 denticulate setae. Surface of carpus, propodus and dactylus covered with curved cuticular combs. Lateral apical combs of carpus setose, and in pereopods 2–7 of different size, outer comb slightly larger; additionally a slightly spinose dorsal comb. Dactylus accessory claw minute or absent. Pleopod 1 lateral margins of neck (narrowest part) with two setae each; distal margins undulating; distal setae of each side divided into a lateral group of 3–4 closely spaced shorter setae and a medial group of 3 widely spaced longer setae. Pleopod 2 endopod extending beyond distal margin of protopod, article 1 flexed slightly outwards, basal sperm chamber with at least one internal strut. Pleopod 3 outer plumose seta longest, exopod with 1 simple seta distally. Remarks. Species of the Haploniscus unicornis complex can be recognized by their characteristic rostrum, which is triangular in dorsal view and has a typical sickle-shape in lateral view, especially in females. The Haploniscus unicornis complex belongs to a group of Haploniscus species (including also H. bicuspis (Sars, 1877) and H. spinifer Hansen, 1916), which is closely related to Mastigoniscus . This group of Haploniscus species shares some important characters with species of Mastigoniscus . These include the trend towards the elongation of the endopod of pleopod 2 in males and the setation of the pereopods, especially the lack of sensory setae (described as“sensory spines” in Brandt 1988), the ornamentation of the pereopods, especially the dorsal comb on the apical carpus, and the reduction of the accessory claw. Similarities also exist in the antennae and the somewhat flattened body shape, although these may be also found in other Haploniscus species. Yet, Mastigoniscus species lack a rostrum, contrary to the Haploniscus unicornis complex and also H. bicuspis , which has a small and inconspicuous rostrum. All these species share the pronounced sexual dimorphism. Therefore allocation of juveniles and females to a species, that is well defined by its adult males can be difficult within the whole group, especially since the distinguishing characters are largely restricted to the habitus and pleopods 1 and 2 of the males. The setation of the pereopods is rather conserved within Mastigoniscus and related species and distinguishing characters in the mouthparts are nearly absent within the whole family. : Published as part of Brökeland, Wiebke, 2010, Description of four new species from the Haploniscus unicornis Menzies, 1956 complex (Isopoda: Asellota: Haploniscidae), pp. 1-35 in Zootaxa 2536 on pages 3-4, DOI: 10.5281/zenodo.196630 : {"references": ["Menzies, R. J. (1956) New abyssal tropical Atlantic isopods, with observations on their biology. American Museum Novitates, 1798, 1 - 16.", "Lincoln, R. J. (1985 b) Deep-sea asellote isopods of the north-east Atlantic: the family Haploniscidae. Journal of Natural History, 19, 655 - 695.", "Sars, G. O. (1877) Prodromus descriptionis crustaceorum ft pycnogonidarum, quae in expeditione norvegica anno 1876, observavit G. O. Sars. Archiv for Mathematik og Naturvidenskab, Kristiania (Oslo), 2, 337 - 371.", "Hansen, H. J. (1916) Crustacea Malacostraca III. The order Isopoda. Danish Ingolf Expedition, 3 (5), 1 - 262.", "Brandt, A. (1988) Morphology and ultrastructure of the sensory spine, a presumed mechanoreceptor of Sphaeroma hookeri (Crustacea, Isopoda), and remarks on similar spines in other peracarids. Journal of Morphology, 198, 219 - 229."]} Text North East Atlantic DataCite Metadata Store (German National Library of Science and Technology) Combs ENVELOPE(-79.150,-79.150,-73.483,-73.483) Menzies ENVELOPE(61.911,61.911,-73.437,-73.437) Seta ENVELOPE(9.895,9.895,63.645,63.645) Sickle ENVELOPE(-66.783,-66.783,-68.867,-68.867) |