Ophiacantha Muller & Troschel 1842
Ophiacantha sp. nov. innom 2 Fig. 18: 10 Material examined GZG.INV.78601 from the latest Aptian to earliest Albian of Blake Nose, tropical northeast Atlantic. Description GZG.INV.78601 is a dissociated, moderately large, distal LAP; more than twice wider than high; fragile; dorsal edge strongly conc...
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ftdatacite:10.5281/zenodo.3844248 2023-05-15T17:41:46+02:00 Ophiacantha Muller & Troschel 1842 Thuy, Ben 2013 https://dx.doi.org/10.5281/zenodo.3844248 https://zenodo.org/record/3844248 unknown Zenodo http://zenodo.org/record/3822836 http://publication.plazi.org/id/6541EF1B6555857BD1302529FFF89F78 http://zoobank.org/E7080722-E348-448D-96E5-D537F4865BB5 https://zenodo.org/communities/biosyslit https://dx.doi.org/10.5852/ejt.2013.48 http://zenodo.org/record/3822836 http://publication.plazi.org/id/6541EF1B6555857BD1302529FFF89F78 https://dx.doi.org/10.5281/zenodo.3822877 http://zoobank.org/E7080722-E348-448D-96E5-D537F4865BB5 https://dx.doi.org/10.5281/zenodo.3844249 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 Echinodermata Ophiuroidea Ophiurida Ophiacanthidae Ophiacantha Text Taxonomic treatment article-journal ScholarlyArticle 2013 ftdatacite https://doi.org/10.5281/zenodo.3844248 https://doi.org/10.5852/ejt.2013.48 https://doi.org/10.5281/zenodo.3822877 https://doi.org/10.5281/zenodo.3844249 2021-11-05T12:55:41Z Ophiacantha sp. nov. innom 2 Fig. 18: 10 Material examined GZG.INV.78601 from the latest Aptian to earliest Albian of Blake Nose, tropical northeast Atlantic. Description GZG.INV.78601 is a dissociated, moderately large, distal LAP; more than twice wider than high; fragile; dorsal edge strongly concave as a result of a well-developed constriction; distal edge convex; proximal edge irregularly undulose, with large, very poorly defined, weakly prominent but strongly protruding spur in dorsal half; outer surface entirely covered with coarsely meshed stereom, slightly becoming finer close to proximal edge of LAP. Four large, equal-sized, equi-distant, near-circular spine articulations freestanding on strongly elevated distal portion of LAP; dorsal and ventral lobes of spine articulations thin, merged into continuous, near-circular volute; spine articulations proximally sharply bordered by vertical, straight, well-defined and prominent ridge; gap between spine articulations and distal edge of LAP relatively narrow, barely as wide as half a spine articulation. Ventral edge of LAP weakly concave, tentacle notch invisible in external view. Inner side of LAP with large, moderately well-defined, prominent, straight, near-horizontal ridge; dorsal tip of ridge strongly widened, dorsally pointed, with ventro-proximally pointing extension; inner side of distal edge with moderately large, poorly defined, non-prominent spur composed of slightly more densely meshed stereom; inner side of tentacle notch relatively large. No perforations discernible. Remarks Only a single specimen of this LAP type is currently known. Although it is from distal arm portions, it displays characters strongly pointing to the genus Ophiacantha , in particular with regard to the shape of the ridge on the inner side, as well as the shape and arrangement of the spine articulations. Closest similarities are shared with LAPs assigned to Ophiacantha from the Albian of England (see below). These differ, however, in displaying a strongly undulose, rather than straight, ridge proximally bordering the spine articulations. The present LAP most probably represents a new species of Ophiacantha but in the absence of more material it cannot be formally described. : Published as part of Thuy, Ben, 2013, Temporary expansion to shelf depths rather than an onshore-offshore trend: the shallow-water rise and demise of the modern deep-sea brittle star family Ophiacanthidae (Echinodermata: Ophiuroidea), pp. 1-242 in European Journal of Taxonomy 48 on page 102, DOI: 10.5852/ejt.2013.48, http://zenodo.org/record/3822836 Text Northeast Atlantic DataCite Metadata Store (German National Library of Science and Technology) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Biodiversity Taxonomy Animalia Echinodermata Ophiuroidea Ophiurida Ophiacanthidae Ophiacantha |
spellingShingle |
Biodiversity Taxonomy Animalia Echinodermata Ophiuroidea Ophiurida Ophiacanthidae Ophiacantha Thuy, Ben Ophiacantha Muller & Troschel 1842 |
topic_facet |
Biodiversity Taxonomy Animalia Echinodermata Ophiuroidea Ophiurida Ophiacanthidae Ophiacantha |
description |
Ophiacantha sp. nov. innom 2 Fig. 18: 10 Material examined GZG.INV.78601 from the latest Aptian to earliest Albian of Blake Nose, tropical northeast Atlantic. Description GZG.INV.78601 is a dissociated, moderately large, distal LAP; more than twice wider than high; fragile; dorsal edge strongly concave as a result of a well-developed constriction; distal edge convex; proximal edge irregularly undulose, with large, very poorly defined, weakly prominent but strongly protruding spur in dorsal half; outer surface entirely covered with coarsely meshed stereom, slightly becoming finer close to proximal edge of LAP. Four large, equal-sized, equi-distant, near-circular spine articulations freestanding on strongly elevated distal portion of LAP; dorsal and ventral lobes of spine articulations thin, merged into continuous, near-circular volute; spine articulations proximally sharply bordered by vertical, straight, well-defined and prominent ridge; gap between spine articulations and distal edge of LAP relatively narrow, barely as wide as half a spine articulation. Ventral edge of LAP weakly concave, tentacle notch invisible in external view. Inner side of LAP with large, moderately well-defined, prominent, straight, near-horizontal ridge; dorsal tip of ridge strongly widened, dorsally pointed, with ventro-proximally pointing extension; inner side of distal edge with moderately large, poorly defined, non-prominent spur composed of slightly more densely meshed stereom; inner side of tentacle notch relatively large. No perforations discernible. Remarks Only a single specimen of this LAP type is currently known. Although it is from distal arm portions, it displays characters strongly pointing to the genus Ophiacantha , in particular with regard to the shape of the ridge on the inner side, as well as the shape and arrangement of the spine articulations. Closest similarities are shared with LAPs assigned to Ophiacantha from the Albian of England (see below). These differ, however, in displaying a strongly undulose, rather than straight, ridge proximally bordering the spine articulations. The present LAP most probably represents a new species of Ophiacantha but in the absence of more material it cannot be formally described. : Published as part of Thuy, Ben, 2013, Temporary expansion to shelf depths rather than an onshore-offshore trend: the shallow-water rise and demise of the modern deep-sea brittle star family Ophiacanthidae (Echinodermata: Ophiuroidea), pp. 1-242 in European Journal of Taxonomy 48 on page 102, DOI: 10.5852/ejt.2013.48, http://zenodo.org/record/3822836 |
format |
Text |
author |
Thuy, Ben |
author_facet |
Thuy, Ben |
author_sort |
Thuy, Ben |
title |
Ophiacantha Muller & Troschel 1842 |
title_short |
Ophiacantha Muller & Troschel 1842 |
title_full |
Ophiacantha Muller & Troschel 1842 |
title_fullStr |
Ophiacantha Muller & Troschel 1842 |
title_full_unstemmed |
Ophiacantha Muller & Troschel 1842 |
title_sort |
ophiacantha muller & troschel 1842 |
publisher |
Zenodo |
publishDate |
2013 |
url |
https://dx.doi.org/10.5281/zenodo.3844248 https://zenodo.org/record/3844248 |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_relation |
http://zenodo.org/record/3822836 http://publication.plazi.org/id/6541EF1B6555857BD1302529FFF89F78 http://zoobank.org/E7080722-E348-448D-96E5-D537F4865BB5 https://zenodo.org/communities/biosyslit https://dx.doi.org/10.5852/ejt.2013.48 http://zenodo.org/record/3822836 http://publication.plazi.org/id/6541EF1B6555857BD1302529FFF89F78 https://dx.doi.org/10.5281/zenodo.3822877 http://zoobank.org/E7080722-E348-448D-96E5-D537F4865BB5 https://dx.doi.org/10.5281/zenodo.3844249 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.3844248 https://doi.org/10.5852/ejt.2013.48 https://doi.org/10.5281/zenodo.3822877 https://doi.org/10.5281/zenodo.3844249 |
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1766143511046914048 |