Cyrtothyris Middlemiss 1959
Cyrtothyris ? sp. Fig. 7.5–7.8 1976? v. “ Cyrtothyris ” maynci new species—Owen, p. 13, pl. 2, fig. 1a–c, pl. 3, fig. 4a–c, text-fig. 7. 2011 v. partim ‘ Cyrtothyris ’ sp.—Hammer et al. , p. 20, table 2. Material and occurrence. Seep 3 (PMO 224.870, PMO 224.904?, PMO 224.919?), seep 8 (PMO 227.428?)...
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ftzenodo:oai:zenodo.org:4952552 2024-09-15T18:09:18+00:00 Cyrtothyris Middlemiss 1959 Sandy, Michael R. Hryniewicz, Krzysztof Hammer, Øyvind Nakrem, Hans Arne Little, Crispin T. S. 2014-11-19 https://doi.org/10.5281/zenodo.4952552 http://treatment.plazi.org/id/466F6C336256FFB19685418FFBC83740 unknown Zenodo https://doi.org/10.11646/zootaxa.3884.6.1 http://zenodo.org/record/4951742 http://publication.plazi.org/id/BA56144B6258FFBF96124213FFD43043 https://sibils.text-analytics.ch/search/collections/plazi/466F6C336256FFB19685418FFBC83740 https://www.gbif.org/species/184851316 https://www.checklistbank.org/dataset/4889/taxon/466F6C336256FFB19685418FFBC83740.taxon https://doi.org/10.5281/zenodo.4951778 http://zoobank.org/BD4F285D-358C-4350-88EA-7FA94513D930 https://zenodo.org/communities/biosyslit https://doi.org/10.5281/zenodo.4952551 https://doi.org/10.5281/zenodo.4952552 oai:zenodo.org:4952552 http://treatment.plazi.org/id/466F6C336256FFB19685418FFBC83740 info:eu-repo/semantics/openAccess Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode Brachiopods from Late Jurassic-Early Cretaceous hydrocarbon seep deposits, central Spitsbergen, Svalbard, pp. 501-532 in Zootaxa, 3884(6), 515, (2014-11-19) Biodiversity Taxonomy Animalia Brachiopoda Rhynchonellata Terebratulida Sellithyrididae Cyrtothyris info:eu-repo/semantics/other 2014 ftzenodo https://doi.org/10.5281/zenodo.495255210.11646/zootaxa.3884.6.110.5281/zenodo.495177810.5281/zenodo.4952551 2024-07-26T22:47:19Z Cyrtothyris ? sp. Fig. 7.5–7.8 1976? v. “ Cyrtothyris ” maynci new species—Owen, p. 13, pl. 2, fig. 1a–c, pl. 3, fig. 4a–c, text-fig. 7. 2011 v. partim ‘ Cyrtothyris ’ sp.—Hammer et al. , p. 20, table 2. Material and occurrence. Seep 3 (PMO 224.870, PMO 224.904?, PMO 224.919?), seep 8 (PMO 227.428?). Description. Rounded, circular, to gently elongate outline, equibiconvex lateral profile, rectimarginate anterior commissure. Discussion. The material from Spitsbergen reaches larger maximum dimensions than “ Cyrtothyris ” maynci described from Greenland (Owen 1976). Broken ventral umbones hamper identification (e.g. Fig. 7.5–7.8) and referral to Cyrtothyris must be considered tentative. Owen commented that the Greenland form has an incipient uniplicate anterior commissure. The Spitsbergen specimens show a rectimarginate anterior commissure to possibly weakly uniplicate (Fig. 7.8, anterior commissure damaged). The Greenland material is from the Falskebugt Member (Harper et al. 2005) of Valanginian age whereas the Spitsbergen specimens are from the Upper Volgian. Cyrtothyris has not been recorded from the Upper Jurassic and these specimens may represent a new form. Some of the Spitsbergen brachiopods are morphologically close to Cyrtothyris and Rouillieria . Species referred to these two genera may be morphologically very similar and details of the ventral umbo and profile can be important in distinguishing between them (as discussed by Middlemiss 1976). Several specimens from seep 9 are now considered to be Seductorithyris septemtrionalis these have an erect beak and lack the produced ventral beak of Cyrtothyris , and are typically less inflated in profile than the latter. However, one specimen from seep 9 (Fig. 7.1–7.4; PMO 224.895) with a suberect ventral umbo and incipiently uniplicate anterior commissure, is referred to Cyrtothyris aff. cyrta (Walker). Middlemiss (1976) considers that this species has a rectimarginate to uniplicate anterior commissure. Stratigraphic and geographic distribution. Upper Volgian ... Other/Unknown Material Greenland Spitsbergen Zenodo |
institution |
Open Polar |
collection |
Zenodo |
op_collection_id |
ftzenodo |
language |
unknown |
topic |
Biodiversity Taxonomy Animalia Brachiopoda Rhynchonellata Terebratulida Sellithyrididae Cyrtothyris |
spellingShingle |
Biodiversity Taxonomy Animalia Brachiopoda Rhynchonellata Terebratulida Sellithyrididae Cyrtothyris Sandy, Michael R. Hryniewicz, Krzysztof Hammer, Øyvind Nakrem, Hans Arne Little, Crispin T. S. Cyrtothyris Middlemiss 1959 |
topic_facet |
Biodiversity Taxonomy Animalia Brachiopoda Rhynchonellata Terebratulida Sellithyrididae Cyrtothyris |
description |
Cyrtothyris ? sp. Fig. 7.5–7.8 1976? v. “ Cyrtothyris ” maynci new species—Owen, p. 13, pl. 2, fig. 1a–c, pl. 3, fig. 4a–c, text-fig. 7. 2011 v. partim ‘ Cyrtothyris ’ sp.—Hammer et al. , p. 20, table 2. Material and occurrence. Seep 3 (PMO 224.870, PMO 224.904?, PMO 224.919?), seep 8 (PMO 227.428?). Description. Rounded, circular, to gently elongate outline, equibiconvex lateral profile, rectimarginate anterior commissure. Discussion. The material from Spitsbergen reaches larger maximum dimensions than “ Cyrtothyris ” maynci described from Greenland (Owen 1976). Broken ventral umbones hamper identification (e.g. Fig. 7.5–7.8) and referral to Cyrtothyris must be considered tentative. Owen commented that the Greenland form has an incipient uniplicate anterior commissure. The Spitsbergen specimens show a rectimarginate anterior commissure to possibly weakly uniplicate (Fig. 7.8, anterior commissure damaged). The Greenland material is from the Falskebugt Member (Harper et al. 2005) of Valanginian age whereas the Spitsbergen specimens are from the Upper Volgian. Cyrtothyris has not been recorded from the Upper Jurassic and these specimens may represent a new form. Some of the Spitsbergen brachiopods are morphologically close to Cyrtothyris and Rouillieria . Species referred to these two genera may be morphologically very similar and details of the ventral umbo and profile can be important in distinguishing between them (as discussed by Middlemiss 1976). Several specimens from seep 9 are now considered to be Seductorithyris septemtrionalis these have an erect beak and lack the produced ventral beak of Cyrtothyris , and are typically less inflated in profile than the latter. However, one specimen from seep 9 (Fig. 7.1–7.4; PMO 224.895) with a suberect ventral umbo and incipiently uniplicate anterior commissure, is referred to Cyrtothyris aff. cyrta (Walker). Middlemiss (1976) considers that this species has a rectimarginate to uniplicate anterior commissure. Stratigraphic and geographic distribution. Upper Volgian ... |
format |
Other/Unknown Material |
author |
Sandy, Michael R. Hryniewicz, Krzysztof Hammer, Øyvind Nakrem, Hans Arne Little, Crispin T. S. |
author_facet |
Sandy, Michael R. Hryniewicz, Krzysztof Hammer, Øyvind Nakrem, Hans Arne Little, Crispin T. S. |
author_sort |
Sandy, Michael R. |
title |
Cyrtothyris Middlemiss 1959 |
title_short |
Cyrtothyris Middlemiss 1959 |
title_full |
Cyrtothyris Middlemiss 1959 |
title_fullStr |
Cyrtothyris Middlemiss 1959 |
title_full_unstemmed |
Cyrtothyris Middlemiss 1959 |
title_sort |
cyrtothyris middlemiss 1959 |
publisher |
Zenodo |
publishDate |
2014 |
url |
https://doi.org/10.5281/zenodo.4952552 http://treatment.plazi.org/id/466F6C336256FFB19685418FFBC83740 |
genre |
Greenland Spitsbergen |
genre_facet |
Greenland Spitsbergen |
op_source |
Brachiopods from Late Jurassic-Early Cretaceous hydrocarbon seep deposits, central Spitsbergen, Svalbard, pp. 501-532 in Zootaxa, 3884(6), 515, (2014-11-19) |
op_relation |
https://doi.org/10.11646/zootaxa.3884.6.1 http://zenodo.org/record/4951742 http://publication.plazi.org/id/BA56144B6258FFBF96124213FFD43043 https://sibils.text-analytics.ch/search/collections/plazi/466F6C336256FFB19685418FFBC83740 https://www.gbif.org/species/184851316 https://www.checklistbank.org/dataset/4889/taxon/466F6C336256FFB19685418FFBC83740.taxon https://doi.org/10.5281/zenodo.4951778 http://zoobank.org/BD4F285D-358C-4350-88EA-7FA94513D930 https://zenodo.org/communities/biosyslit https://doi.org/10.5281/zenodo.4952551 https://doi.org/10.5281/zenodo.4952552 oai:zenodo.org:4952552 http://treatment.plazi.org/id/466F6C336256FFB19685418FFBC83740 |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode |
op_doi |
https://doi.org/10.5281/zenodo.495255210.11646/zootaxa.3884.6.110.5281/zenodo.495177810.5281/zenodo.4952551 |
_version_ |
1810446770409308160 |