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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Zenodo
2014
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Online Access: | https://dx.doi.org/10.5281/zenodo.4952551 https://zenodo.org/record/4952551 |
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ftdatacite:10.5281/zenodo.4952551 |
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Open Polar |
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DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
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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 of Spitsbergen. : Published as part of Sandy, Michael R., Hryniewicz, Krzysztof, Hammer, Øyvind, Nakrem, Hans Arne & Little, Crispin T. S., 2014, Brachiopods from Late Jurassic-Early Cretaceous hydrocarbon seep deposits, central Spitsbergen, Svalbard, pp. 501-532 in Zootaxa 3884 (6) on page 515, DOI: 10.11646/zootaxa.3884.6.1, http://zenodo.org/record/4951742 : {"references": ["Owen, E. F. (1976) Some Lower Cretaceous brachiopods from East Greenland. Meddelelser om GrOnland, 171 (3), 1 - 19.", "Harper, D. A. T., Alsen, P., Owen, E. F. & Sandy, M. R. (2005) Early Cretaceous brachiopods from North-East Greenland: biofacies and biogeography. Bulletin of the Geological Society of Denmark, 52, 213 - 225.", "Middlemiss, F. A. (1976) Lower Cretaceous Terebratulidina of northern England and Germany and their geological background. Geologisches Jahrbuch, 30, 21 - 104."]} |
format |
Text |
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://dx.doi.org/10.5281/zenodo.4952551 https://zenodo.org/record/4952551 |
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ENVELOPE(-57.050,-57.050,-84.050,-84.050) ENVELOPE(70.203,70.203,-49.626,-49.626) ENVELOPE(-19.333,-19.333,74.550,74.550) |
geographic |
Svalbard Greenland Harper Gronland Falskebugt |
geographic_facet |
Svalbard Greenland Harper Gronland Falskebugt |
genre |
East Greenland Greenland Svalbard Spitsbergen |
genre_facet |
East Greenland Greenland Svalbard Spitsbergen |
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op_rights |
Open Access info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5281/zenodo.4952551 https://doi.org/10.11646/zootaxa.3884.6.1 https://doi.org/10.5281/zenodo.4951778 https://doi.org/10.5281/zenodo.4952552 |
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ftdatacite:10.5281/zenodo.4952551 2023-05-15T16:03:47+02:00 Cyrtothyris Middlemiss 1959 Sandy, Michael R. Hryniewicz, Krzysztof Hammer, Øyvind Nakrem, Hans Arne Little, Crispin T. S. 2014 https://dx.doi.org/10.5281/zenodo.4952551 https://zenodo.org/record/4952551 unknown Zenodo http://zenodo.org/record/4951742 http://publication.plazi.org/id/BA56144B6258FFBF96124213FFD43043 http://zoobank.org/BD4F285D-358C-4350-88EA-7FA94513D930 https://zenodo.org/communities/biosyslit https://dx.doi.org/10.11646/zootaxa.3884.6.1 http://zenodo.org/record/4951742 http://publication.plazi.org/id/BA56144B6258FFBF96124213FFD43043 https://dx.doi.org/10.5281/zenodo.4951778 http://zoobank.org/BD4F285D-358C-4350-88EA-7FA94513D930 https://dx.doi.org/10.5281/zenodo.4952552 https://zenodo.org/communities/biosyslit Open Access info:eu-repo/semantics/openAccess Biodiversity Taxonomy Animalia Brachiopoda Rhynchonellata Terebratulida Sellithyrididae Cyrtothyris Text Taxonomic treatment article-journal ScholarlyArticle 2014 ftdatacite https://doi.org/10.5281/zenodo.4952551 https://doi.org/10.11646/zootaxa.3884.6.1 https://doi.org/10.5281/zenodo.4951778 https://doi.org/10.5281/zenodo.4952552 2021-11-05T12:55:41Z 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 of Spitsbergen. : Published as part of Sandy, Michael R., Hryniewicz, Krzysztof, Hammer, Øyvind, Nakrem, Hans Arne & Little, Crispin T. S., 2014, Brachiopods from Late Jurassic-Early Cretaceous hydrocarbon seep deposits, central Spitsbergen, Svalbard, pp. 501-532 in Zootaxa 3884 (6) on page 515, DOI: 10.11646/zootaxa.3884.6.1, http://zenodo.org/record/4951742 : {"references": ["Owen, E. F. (1976) Some Lower Cretaceous brachiopods from East Greenland. Meddelelser om GrOnland, 171 (3), 1 - 19.", "Harper, D. A. T., Alsen, P., Owen, E. F. & Sandy, M. R. (2005) Early Cretaceous brachiopods from North-East Greenland: biofacies and biogeography. Bulletin of the Geological Society of Denmark, 52, 213 - 225.", "Middlemiss, F. A. (1976) Lower Cretaceous Terebratulidina of northern England and Germany and their geological background. Geologisches Jahrbuch, 30, 21 - 104."]} Text East Greenland Greenland Svalbard Spitsbergen DataCite Metadata Store (German National Library of Science and Technology) Svalbard Greenland Harper ENVELOPE(-57.050,-57.050,-84.050,-84.050) Gronland ENVELOPE(70.203,70.203,-49.626,-49.626) Falskebugt ENVELOPE(-19.333,-19.333,74.550,74.550) |