Stegopoma giganteum Ramil & Vervoort 1992

Stegopoma giganteum Ramil & Vervoort, 1992 Fig. 3D–E; Table 3 Stegopoma giganteum Ramil & Vervoort, 1992: 36–38, fig. 5e–f. Material examined SOUTH ATLANTIC OCEAN • 5 colonies, up to 15 mm high (1 growing on Zygophylax sp., 1 on bivalve shell, 1 on ghost fishing net with a gonotheca); Valdiv...

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Main Authors: Gil, Marta, Ramil, Fran
Format: Text
Language:unknown
Published: Zenodo 2021
Subjects:
Online Access:https://dx.doi.org/10.5281/zenodo.5088924
https://zenodo.org/record/5088924
id ftdatacite:10.5281/zenodo.5088924
record_format openpolar
institution Open Polar
collection DataCite Metadata Store (German National Library of Science and Technology)
op_collection_id ftdatacite
language unknown
topic Biodiversity
Taxonomy
Animalia
Cnidaria
Hydrozoa
Leptothecata
Tiarannidae
Stegopoma
Stegopoma giganteum
spellingShingle Biodiversity
Taxonomy
Animalia
Cnidaria
Hydrozoa
Leptothecata
Tiarannidae
Stegopoma
Stegopoma giganteum
Gil, Marta
Ramil, Fran
Stegopoma giganteum Ramil & Vervoort 1992
topic_facet Biodiversity
Taxonomy
Animalia
Cnidaria
Hydrozoa
Leptothecata
Tiarannidae
Stegopoma
Stegopoma giganteum
description Stegopoma giganteum Ramil & Vervoort, 1992 Fig. 3D–E; Table 3 Stegopoma giganteum Ramil & Vervoort, 1992: 36–38, fig. 5e–f. Material examined SOUTH ATLANTIC OCEAN • 5 colonies, up to 15 mm high (1 growing on Zygophylax sp., 1 on bivalve shell, 1 on ghost fishing net with a gonotheca); Valdivia Seamount, stn BT12; 24°49′01″–24°47′38″ S, 6°24′40″–6°25′26″ E; 887– 886 m depth; 7 Feb. 2015; SEAFO-2015 leg.; SEAFO-2015-40222, SEAFO-2015-40612, SEAFO-2015-40811, SEAFO-2015-40827, SEAFO-2015-40852, LZM-UV slide R. 587. Description Colony composed of a thin and ramified stolon, growing attached on the hydrocaulus and branches of Zygophylax sp., from which arise pedicellate hydrothecae and gonothecae. Hydrothecae placed at the end of long, slender, smooth-walled and unbranched pedicels with some transversal scars due to regeneration after damage. Hydrothecae large, tubular, with smooth walls, almost bilaterally symmetrical, and slightly widening distally (Fig. 3D). Aperture closed by a triangular operculum adopting the shape of a gabled roof, formed by two opposite, semicircular sections on the distal part of the hydrothecal wall; opercular apparatus provided with longitudinal strips running downwards from top to basis. Hydranths are damaged or absent, and their description is not possible, but we can confirm that they are attached to the inner side of the hydrothecal base by means of a hyaline membranous ring, identical to the description given by Ramil & Vervoort (1992); this membranous ring indicates the boundary between the pedicel and the hydrotheca. The gonotheca shows similar morphology to that described for the hydrotheca, including the closing apparatus, but it is supported by a shorter pedicel (Fig. 3E). Remarks This is the first record of S. giganteum after its original description. The large size of the hydrothecae (2–3 mm long), with long and narrow pedicels, are distinctive features of this species. In addition, the opercular apparatus, the presence of a hyaline membranous ring at the attachment site of the hydranth to the hydrothecal base, and the gonothecal shape fit well with the original description of this species. Consequently, despite the wide geographical distance between the type locality and the present record, we include this material in S. giganteum . Distribution This species is only known from off Cape São Vicente (Portugal; type locality) where it was collected at a depth of 1523 m (Ramil & Vervoort 1992). This is the first record for the South Atlantic. : Published as part of Gil, Marta & Ramil, Fran, 2021, Hydroids (Cnidaria, Hydrozoa) from the Vema and Valdivia seamounts (SE Atlantic), pp. 49-96 in European Journal of Taxonomy 758 on pages 60-61, DOI: 10.5852/ejt.2021.758.1425, http://zenodo.org/record/5088125 : {"references": ["Ramil F. & Vervoort W. 1992. Report on the Hydroida collected by the \" BALGIM \" expedition in and around the Strait of Gibraltar. Zoologische Verhandelingen, Leiden 277: 1 - 262."]}
format Text
author Gil, Marta
Ramil, Fran
author_facet Gil, Marta
Ramil, Fran
author_sort Gil, Marta
title Stegopoma giganteum Ramil & Vervoort 1992
title_short Stegopoma giganteum Ramil & Vervoort 1992
title_full Stegopoma giganteum Ramil & Vervoort 1992
title_fullStr Stegopoma giganteum Ramil & Vervoort 1992
title_full_unstemmed Stegopoma giganteum Ramil & Vervoort 1992
title_sort stegopoma giganteum ramil & vervoort 1992
publisher Zenodo
publishDate 2021
url https://dx.doi.org/10.5281/zenodo.5088924
https://zenodo.org/record/5088924
genre South Atlantic Ocean
genre_facet South Atlantic Ocean
op_relation http://zenodo.org/record/5088125
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op_rights Open Access
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op_doi https://doi.org/10.5281/zenodo.5088924
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spelling ftdatacite:10.5281/zenodo.5088924 2023-05-15T18:21:23+02:00 Stegopoma giganteum Ramil & Vervoort 1992 Gil, Marta Ramil, Fran 2021 https://dx.doi.org/10.5281/zenodo.5088924 https://zenodo.org/record/5088924 unknown Zenodo http://zenodo.org/record/5088125 http://publication.plazi.org/id/17562A29FFB2FF9BEF24FFE6336CFFF9 http://zoobank.org/7CA6D8AC-2312-47F9-8C17-528B94E4C8A7 https://zenodo.org/communities/biosyslit https://dx.doi.org/10.5852/ejt.2021.758.1425 http://zenodo.org/record/5088125 http://publication.plazi.org/id/17562A29FFB2FF9BEF24FFE6336CFFF9 https://dx.doi.org/10.5281/zenodo.5088135 http://zoobank.org/7CA6D8AC-2312-47F9-8C17-528B94E4C8A7 https://dx.doi.org/10.5281/zenodo.5088923 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 Cnidaria Hydrozoa Leptothecata Tiarannidae Stegopoma Stegopoma giganteum Text Taxonomic treatment article-journal ScholarlyArticle 2021 ftdatacite https://doi.org/10.5281/zenodo.5088924 https://doi.org/10.5852/ejt.2021.758.1425 https://doi.org/10.5281/zenodo.5088135 https://doi.org/10.5281/zenodo.5088923 2021-11-05T12:55:41Z Stegopoma giganteum Ramil & Vervoort, 1992 Fig. 3D–E; Table 3 Stegopoma giganteum Ramil & Vervoort, 1992: 36–38, fig. 5e–f. Material examined SOUTH ATLANTIC OCEAN • 5 colonies, up to 15 mm high (1 growing on Zygophylax sp., 1 on bivalve shell, 1 on ghost fishing net with a gonotheca); Valdivia Seamount, stn BT12; 24°49′01″–24°47′38″ S, 6°24′40″–6°25′26″ E; 887– 886 m depth; 7 Feb. 2015; SEAFO-2015 leg.; SEAFO-2015-40222, SEAFO-2015-40612, SEAFO-2015-40811, SEAFO-2015-40827, SEAFO-2015-40852, LZM-UV slide R. 587. Description Colony composed of a thin and ramified stolon, growing attached on the hydrocaulus and branches of Zygophylax sp., from which arise pedicellate hydrothecae and gonothecae. Hydrothecae placed at the end of long, slender, smooth-walled and unbranched pedicels with some transversal scars due to regeneration after damage. Hydrothecae large, tubular, with smooth walls, almost bilaterally symmetrical, and slightly widening distally (Fig. 3D). Aperture closed by a triangular operculum adopting the shape of a gabled roof, formed by two opposite, semicircular sections on the distal part of the hydrothecal wall; opercular apparatus provided with longitudinal strips running downwards from top to basis. Hydranths are damaged or absent, and their description is not possible, but we can confirm that they are attached to the inner side of the hydrothecal base by means of a hyaline membranous ring, identical to the description given by Ramil & Vervoort (1992); this membranous ring indicates the boundary between the pedicel and the hydrotheca. The gonotheca shows similar morphology to that described for the hydrotheca, including the closing apparatus, but it is supported by a shorter pedicel (Fig. 3E). Remarks This is the first record of S. giganteum after its original description. The large size of the hydrothecae (2–3 mm long), with long and narrow pedicels, are distinctive features of this species. In addition, the opercular apparatus, the presence of a hyaline membranous ring at the attachment site of the hydranth to the hydrothecal base, and the gonothecal shape fit well with the original description of this species. Consequently, despite the wide geographical distance between the type locality and the present record, we include this material in S. giganteum . Distribution This species is only known from off Cape São Vicente (Portugal; type locality) where it was collected at a depth of 1523 m (Ramil & Vervoort 1992). This is the first record for the South Atlantic. : Published as part of Gil, Marta & Ramil, Fran, 2021, Hydroids (Cnidaria, Hydrozoa) from the Vema and Valdivia seamounts (SE Atlantic), pp. 49-96 in European Journal of Taxonomy 758 on pages 60-61, DOI: 10.5852/ejt.2021.758.1425, http://zenodo.org/record/5088125 : {"references": ["Ramil F. & Vervoort W. 1992. Report on the Hydroida collected by the \" BALGIM \" expedition in and around the Strait of Gibraltar. Zoologische Verhandelingen, Leiden 277: 1 - 262."]} Text South Atlantic Ocean DataCite Metadata Store (German National Library of Science and Technology)