Camptonectes (Costicamptonectes) milnelandensis Fursich 1982
Camptonectes ( Costicamptonectes ) aff. milnelandensis Fürsich, 1982 (Figure 10 H–K) 1982 aff. Camptonectes ( Costicamptonectes ) milnelandensis sp. nov. —Fürsich, p. 50, figs. 23 C–D, F, G. Material examined. Two poorly preserved right valves. In addition a single external mould with silicone rubbe...
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2014
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Online Access: | https://dx.doi.org/10.5281/zenodo.5228251 https://zenodo.org/record/5228251 |
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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 Mollusca Bivalvia Pectinoida Pectinidae Camptonectes Camptonectes milnelandensis |
spellingShingle |
Biodiversity Taxonomy Animalia Mollusca Bivalvia Pectinoida Pectinidae Camptonectes Camptonectes milnelandensis Hryniewicz, Krzysztof Little, Crispin T. S. Nakrem, Hans Arne Camptonectes (Costicamptonectes) milnelandensis Fursich 1982 |
topic_facet |
Biodiversity Taxonomy Animalia Mollusca Bivalvia Pectinoida Pectinidae Camptonectes Camptonectes milnelandensis |
description |
Camptonectes ( Costicamptonectes ) aff. milnelandensis Fürsich, 1982 (Figure 10 H–K) 1982 aff. Camptonectes ( Costicamptonectes ) milnelandensis sp. nov. —Fürsich, p. 50, figs. 23 C–D, F, G. Material examined. Two poorly preserved right valves. In addition a single external mould with silicone rubber cast from the Dorsoplanites bed (PMO 226.604). See Appendix 1 for the list of specimens. Dimensions. 15–30.5 mm in length, 15–28.2 mm in height. See Appendix 2G for details. Description. Shell small to medium sized, very thin, appears to get shorter at later growth stages. Right valve suborbicular, moderately inflated, with small posterior and larger anterior auricle, ventrally delineated by a deep byssal notch. Ctenolium well developed. Antero- and posterodorsal margins subequal, anterodorsal margin slightly concave. Anterior margin slightly more convex than posterior margin, ventral margin evenly rounded. Preserved ornament consists of weak divaricating radial ribs, intersected by weak but dense growth lines. Anterodorsal margin ornamented by ca. 6 subparallel radial ribs. Left valve, musculature and dentition unknown. Remarks. We compare our specimens with C . ( Co. ) milnelandensis because of its ornament of commarginal growth lines accompanied by divaricate ribs and with additional radial ribs close to the anterodorsal margin. The Svalbard specimens have a slightly higher umbonal angle than comparatively sized specimens of C . ( Co. ) milnelandensis from Greenland (Fürsich 1982). However, no specimens larger than 18 mm were reported by Fürsich (1982) so we are unable to compare the ontogenetic changes of umbonal angle of specimens from both localities. In addition, the Svalbard material is composed of right valves only. Until more is known about C . ( Co. ) milnelandensis from both Greenland and Svalbard, we prefer to leave our species in open nomenclature. Occurrence. Camptonectes ( Co. ) milnelandensis : Upper Callovian–Upper Oxfordian of Milne Land, East Greenland (Fürsich 1982). Camptonectes ( Co. ) aff. milnelandensis : Seep 8 (Upper Volgian), Slottsmøya Member (Tab. 1); also Dorsoplanites bed (Middle Volgian), Svalbard. Palaeoecology. We assume that C . ( Co. ) aff. milnelandensis was a byssally attached suspension feeder, as indicated by the presence of a well-developed ctenolium. Byssal attachment is a characteristic feature for the genus Camptonectes , although larger species in the subgenus McLearnia Crickmay, 1930, probably lost a functional byssal attachment in maturity (e.g. Fürsich 1982). An expanded anterior auricle in pectinids is an adaptation for byssal attachment with the commissure non-perpendicular to the substrate (Stanley 1970). In such a position the auricle and anterior shell margin acts as a fulcrum and prevents the shell overturning from its set position. As in most of the pectinids, C . ( Co. ) aff. milnelandensis probably had the ability to swim to escape predation, although the umbonal angle is too acute to assume this was habitual (Stanley 1970). : Published as part of Hryniewicz, Krzysztof, Little, Crispin T. S. & Nakrem, Hans Arne, 2014, Bivalves from the latest Jurassic-earliest Cretaceous hydrocarbon seep carbonates from central Spitsbergen, Svalbard, pp. 1-66 in Zootaxa 3859 (1) on page 27, DOI: 10.11646/zootaxa.3859.1.1, http://zenodo.org/record/4930112 : {"references": ["Fursich, F. T. (1982) Upper Jurassic bivalves from Milne Land, East Greenland. GrOnlands Geologiske UndersOgelse, 144, 1 - 126.", "Crickmay, C. H. (1930) Fossils from Harrison Lake area, British Columbia. Bulletin of the National Museum of Canada, 63, 33 - 66, pls. 1 - 15.", "Stanley, S. M. (1970) Relation of shell form to life habits of the Bivalvia (Mollusca). The Geological Society of America Memoir, 125, 1 - 296. http: // dx. doi. org / 10.1130 / mem 125 - p 1"]} |
format |
Text |
author |
Hryniewicz, Krzysztof Little, Crispin T. S. Nakrem, Hans Arne |
author_facet |
Hryniewicz, Krzysztof Little, Crispin T. S. Nakrem, Hans Arne |
author_sort |
Hryniewicz, Krzysztof |
title |
Camptonectes (Costicamptonectes) milnelandensis Fursich 1982 |
title_short |
Camptonectes (Costicamptonectes) milnelandensis Fursich 1982 |
title_full |
Camptonectes (Costicamptonectes) milnelandensis Fursich 1982 |
title_fullStr |
Camptonectes (Costicamptonectes) milnelandensis Fursich 1982 |
title_full_unstemmed |
Camptonectes (Costicamptonectes) milnelandensis Fursich 1982 |
title_sort |
camptonectes (costicamptonectes) milnelandensis fursich 1982 |
publisher |
Zenodo |
publishDate |
2014 |
url |
https://dx.doi.org/10.5281/zenodo.5228251 https://zenodo.org/record/5228251 |
long_lat |
ENVELOPE(-125.003,-125.003,54.000,54.000) ENVELOPE(161.117,161.117,-78.033,-78.033) ENVELOPE(17.415,17.415,78.046,78.046) ENVELOPE(-26.750,-26.750,70.683,70.683) |
geographic |
Svalbard Canada Greenland British Columbia Fulcrum Slottsmøya Milne Land |
geographic_facet |
Svalbard Canada Greenland British Columbia Fulcrum Slottsmøya Milne Land |
genre |
East Greenland Greenland Milne Land Svalbard Spitsbergen |
genre_facet |
East Greenland Greenland Milne Land Svalbard Spitsbergen |
op_relation |
http://zenodo.org/record/4930112 http://publication.plazi.org/id/5E0865359F19E3250471FFA5FFA82955 http://zoobank.org/24FCAAE1-AB7C-4FAD-8698-D0C9F12400EC https://zenodo.org/communities/biosyslit https://dx.doi.org/10.11646/zootaxa.3859.1.1 http://zenodo.org/record/4930112 http://publication.plazi.org/id/5E0865359F19E3250471FFA5FFA82955 https://dx.doi.org/10.5281/zenodo.5228099 http://zoobank.org/24FCAAE1-AB7C-4FAD-8698-D0C9F12400EC https://dx.doi.org/10.5281/zenodo.5228250 https://zenodo.org/communities/biosyslit |
op_rights |
Open Access info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5281/zenodo.5228251 https://doi.org/10.11646/zootaxa.3859.1.1 https://doi.org/10.5281/zenodo.5228099 https://doi.org/10.5281/zenodo.5228250 |
_version_ |
1766399549548527616 |
spelling |
ftdatacite:10.5281/zenodo.5228251 2023-05-15T16:03:51+02:00 Camptonectes (Costicamptonectes) milnelandensis Fursich 1982 Hryniewicz, Krzysztof Little, Crispin T. S. Nakrem, Hans Arne 2014 https://dx.doi.org/10.5281/zenodo.5228251 https://zenodo.org/record/5228251 unknown Zenodo http://zenodo.org/record/4930112 http://publication.plazi.org/id/5E0865359F19E3250471FFA5FFA82955 http://zoobank.org/24FCAAE1-AB7C-4FAD-8698-D0C9F12400EC https://zenodo.org/communities/biosyslit https://dx.doi.org/10.11646/zootaxa.3859.1.1 http://zenodo.org/record/4930112 http://publication.plazi.org/id/5E0865359F19E3250471FFA5FFA82955 https://dx.doi.org/10.5281/zenodo.5228099 http://zoobank.org/24FCAAE1-AB7C-4FAD-8698-D0C9F12400EC https://dx.doi.org/10.5281/zenodo.5228250 https://zenodo.org/communities/biosyslit Open Access info:eu-repo/semantics/openAccess Biodiversity Taxonomy Animalia Mollusca Bivalvia Pectinoida Pectinidae Camptonectes Camptonectes milnelandensis Taxonomic treatment article-journal Text ScholarlyArticle 2014 ftdatacite https://doi.org/10.5281/zenodo.5228251 https://doi.org/10.11646/zootaxa.3859.1.1 https://doi.org/10.5281/zenodo.5228099 https://doi.org/10.5281/zenodo.5228250 2022-02-08T12:07:57Z Camptonectes ( Costicamptonectes ) aff. milnelandensis Fürsich, 1982 (Figure 10 H–K) 1982 aff. Camptonectes ( Costicamptonectes ) milnelandensis sp. nov. —Fürsich, p. 50, figs. 23 C–D, F, G. Material examined. Two poorly preserved right valves. In addition a single external mould with silicone rubber cast from the Dorsoplanites bed (PMO 226.604). See Appendix 1 for the list of specimens. Dimensions. 15–30.5 mm in length, 15–28.2 mm in height. See Appendix 2G for details. Description. Shell small to medium sized, very thin, appears to get shorter at later growth stages. Right valve suborbicular, moderately inflated, with small posterior and larger anterior auricle, ventrally delineated by a deep byssal notch. Ctenolium well developed. Antero- and posterodorsal margins subequal, anterodorsal margin slightly concave. Anterior margin slightly more convex than posterior margin, ventral margin evenly rounded. Preserved ornament consists of weak divaricating radial ribs, intersected by weak but dense growth lines. Anterodorsal margin ornamented by ca. 6 subparallel radial ribs. Left valve, musculature and dentition unknown. Remarks. We compare our specimens with C . ( Co. ) milnelandensis because of its ornament of commarginal growth lines accompanied by divaricate ribs and with additional radial ribs close to the anterodorsal margin. The Svalbard specimens have a slightly higher umbonal angle than comparatively sized specimens of C . ( Co. ) milnelandensis from Greenland (Fürsich 1982). However, no specimens larger than 18 mm were reported by Fürsich (1982) so we are unable to compare the ontogenetic changes of umbonal angle of specimens from both localities. In addition, the Svalbard material is composed of right valves only. Until more is known about C . ( Co. ) milnelandensis from both Greenland and Svalbard, we prefer to leave our species in open nomenclature. Occurrence. Camptonectes ( Co. ) milnelandensis : Upper Callovian–Upper Oxfordian of Milne Land, East Greenland (Fürsich 1982). Camptonectes ( Co. ) aff. milnelandensis : Seep 8 (Upper Volgian), Slottsmøya Member (Tab. 1); also Dorsoplanites bed (Middle Volgian), Svalbard. Palaeoecology. We assume that C . ( Co. ) aff. milnelandensis was a byssally attached suspension feeder, as indicated by the presence of a well-developed ctenolium. Byssal attachment is a characteristic feature for the genus Camptonectes , although larger species in the subgenus McLearnia Crickmay, 1930, probably lost a functional byssal attachment in maturity (e.g. Fürsich 1982). An expanded anterior auricle in pectinids is an adaptation for byssal attachment with the commissure non-perpendicular to the substrate (Stanley 1970). In such a position the auricle and anterior shell margin acts as a fulcrum and prevents the shell overturning from its set position. As in most of the pectinids, C . ( Co. ) aff. milnelandensis probably had the ability to swim to escape predation, although the umbonal angle is too acute to assume this was habitual (Stanley 1970). : Published as part of Hryniewicz, Krzysztof, Little, Crispin T. S. & Nakrem, Hans Arne, 2014, Bivalves from the latest Jurassic-earliest Cretaceous hydrocarbon seep carbonates from central Spitsbergen, Svalbard, pp. 1-66 in Zootaxa 3859 (1) on page 27, DOI: 10.11646/zootaxa.3859.1.1, http://zenodo.org/record/4930112 : {"references": ["Fursich, F. T. (1982) Upper Jurassic bivalves from Milne Land, East Greenland. GrOnlands Geologiske UndersOgelse, 144, 1 - 126.", "Crickmay, C. H. (1930) Fossils from Harrison Lake area, British Columbia. Bulletin of the National Museum of Canada, 63, 33 - 66, pls. 1 - 15.", "Stanley, S. M. (1970) Relation of shell form to life habits of the Bivalvia (Mollusca). The Geological Society of America Memoir, 125, 1 - 296. http: // dx. doi. org / 10.1130 / mem 125 - p 1"]} Text East Greenland Greenland Milne Land Svalbard Spitsbergen DataCite Metadata Store (German National Library of Science and Technology) Svalbard Canada Greenland British Columbia ENVELOPE(-125.003,-125.003,54.000,54.000) Fulcrum ENVELOPE(161.117,161.117,-78.033,-78.033) Slottsmøya ENVELOPE(17.415,17.415,78.046,78.046) Milne Land ENVELOPE(-26.750,-26.750,70.683,70.683) |