Sassenfjordia sassenfjordensis Nakrem 2017, sp. nov.
Sassenfjordia sassenfjordensis sp. nov. (Fig. 7) 2015 Gastropoda gen. et sp. indet. B; Hryniewicz et al. 2015a, table 1. Diagnosis. Large multispiral protoconch ornamented with spiral bands. Naticiform teleoconch with stongly prosocline growth lines and deeply incised suture. Holotype: PMO 217.512,...
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ftzenodo:oai:zenodo.org:6009597 2023-05-15T18:15:06+02:00 Sassenfjordia sassenfjordensis Nakrem 2017, sp. nov. Nakrem, Hans Arne 2017-10-06 https://zenodo.org/record/6009597 https://doi.org/10.5281/zenodo.6009597 unknown info:eu-repo/semantics/altIdentifier/url/http://treatment.plazi.org/id/B5525419D02BFFFCFF7BFE93FD36FA9B doi:10.11646/zootaxa.4329.4.3 http://zenodo.org/record/1003014 http://publication.plazi.org/id/496B2C61D020FFF7FFECFFDFFF9BFFD5 doi:10.5281/zenodo.1003026 http://zoobank.org/A0552Ffb-Fe2B-4Fad-809A-A1274Ac86Bcc doi:10.5281/zenodo.6009596 https://zenodo.org/communities/biosyslit https://zenodo.org/record/6009597 https://doi.org/10.5281/zenodo.6009597 oai:zenodo.org:6009597 info:eu-repo/semantics/openAccess https://creativecommons.org/publicdomain/zero/1.0/legalcode Gastropods from the Late Jurassic - Early Cretaceous seep deposits in Spitsbergen, Svalbard, pp. 351-374 in Zootaxa 4329(4) 362 Biodiversity Taxonomy Animalia Mollusca Gastropoda Littorinimorpha Naticidae Sassenfjordia info:eu-repo/semantics/other publication-taxonomictreatment 2017 ftzenodo https://doi.org/10.5281/zenodo.600959710.11646/zootaxa.4329.4.310.5281/zenodo.100302610.5281/zenodo.6009596 2023-03-10T18:44:12Z Sassenfjordia sassenfjordensis sp. nov. (Fig. 7) 2015 Gastropoda gen. et sp. indet. B; Hryniewicz et al. 2015a, table 1. Diagnosis. Large multispiral protoconch ornamented with spiral bands. Naticiform teleoconch with stongly prosocline growth lines and deeply incised suture. Holotype: PMO 217.512, H = 1.6 mm, W = 2.1 mm; one specimen only. Type locality and age: Seep # 9 in Sassenfjorden area, Svalbard; late Berriasian, Early Cretaceous. Description. Protoconch only partially preserved but large (1.1 mm in diameter) and ornamented by strong spiral bands. Demarcation between protoconch and teleoconch poorly preserved but seemingly expressed by a change in coiling geometry. Teleoconch naticiform with incised suture and strongly convex whorls. Shell flanks smooth apart from well expressed and strongly prosocline growth lines. Aperture and umbilical region not preserved. Remarks. In spite of having only a single and imperfectly preserved specimen, we decided to describe a new genus and species, warranted by the unique set of characters, including a naticiform shell with strong, prosocline growth lines and a large protoconch ornamented by spiral bands. The most similar teleoconchs are observed in members of the Gyrodidae Wenz, 1938, which are considered either as ampullospirids (Campaniloidea) by Kase & Ishikawa (2003) or naticoids by Bandel (1999) and Bandel & Dockery (2016). However, gyrodids posses entirely smooth protoconchs (Dockery 1993; Bandel 1999). The only group having comparable large protoconch with spiral ornament we could trace is the naticoid subfamily Sininae. The protoconch of the Recent Sinum perspectivum (Say, 1831), illustrated by Bandel (1999), is large (1.5 mm of diameter) and strongly ornamented by spiral ribs. However, in contrast to S. sassenfjordensis the teloconch of Sinum also possesses a strong spiral ornament. Our identification of S. sassenfjordensis as Naticidae: Sininae remains, however, tentative, as according to Kase & Ishikawa (2003) the oldest confirmed Naticidae come ... Other/Unknown Material Sassenfjord* Sassenfjorden Svalbard Zenodo Dockery ENVELOPE(164.550,164.550,-71.217,-71.217) Sassenfjorden ENVELOPE(16.217,16.217,78.412,78.412) Svalbard |
institution |
Open Polar |
collection |
Zenodo |
op_collection_id |
ftzenodo |
language |
unknown |
topic |
Biodiversity Taxonomy Animalia Mollusca Gastropoda Littorinimorpha Naticidae Sassenfjordia |
spellingShingle |
Biodiversity Taxonomy Animalia Mollusca Gastropoda Littorinimorpha Naticidae Sassenfjordia Nakrem, Hans Arne Sassenfjordia sassenfjordensis Nakrem 2017, sp. nov. |
topic_facet |
Biodiversity Taxonomy Animalia Mollusca Gastropoda Littorinimorpha Naticidae Sassenfjordia |
description |
Sassenfjordia sassenfjordensis sp. nov. (Fig. 7) 2015 Gastropoda gen. et sp. indet. B; Hryniewicz et al. 2015a, table 1. Diagnosis. Large multispiral protoconch ornamented with spiral bands. Naticiform teleoconch with stongly prosocline growth lines and deeply incised suture. Holotype: PMO 217.512, H = 1.6 mm, W = 2.1 mm; one specimen only. Type locality and age: Seep # 9 in Sassenfjorden area, Svalbard; late Berriasian, Early Cretaceous. Description. Protoconch only partially preserved but large (1.1 mm in diameter) and ornamented by strong spiral bands. Demarcation between protoconch and teleoconch poorly preserved but seemingly expressed by a change in coiling geometry. Teleoconch naticiform with incised suture and strongly convex whorls. Shell flanks smooth apart from well expressed and strongly prosocline growth lines. Aperture and umbilical region not preserved. Remarks. In spite of having only a single and imperfectly preserved specimen, we decided to describe a new genus and species, warranted by the unique set of characters, including a naticiform shell with strong, prosocline growth lines and a large protoconch ornamented by spiral bands. The most similar teleoconchs are observed in members of the Gyrodidae Wenz, 1938, which are considered either as ampullospirids (Campaniloidea) by Kase & Ishikawa (2003) or naticoids by Bandel (1999) and Bandel & Dockery (2016). However, gyrodids posses entirely smooth protoconchs (Dockery 1993; Bandel 1999). The only group having comparable large protoconch with spiral ornament we could trace is the naticoid subfamily Sininae. The protoconch of the Recent Sinum perspectivum (Say, 1831), illustrated by Bandel (1999), is large (1.5 mm of diameter) and strongly ornamented by spiral ribs. However, in contrast to S. sassenfjordensis the teloconch of Sinum also possesses a strong spiral ornament. Our identification of S. sassenfjordensis as Naticidae: Sininae remains, however, tentative, as according to Kase & Ishikawa (2003) the oldest confirmed Naticidae come ... |
format |
Other/Unknown Material |
author |
Nakrem, Hans Arne |
author_facet |
Nakrem, Hans Arne |
author_sort |
Nakrem, Hans Arne |
title |
Sassenfjordia sassenfjordensis Nakrem 2017, sp. nov. |
title_short |
Sassenfjordia sassenfjordensis Nakrem 2017, sp. nov. |
title_full |
Sassenfjordia sassenfjordensis Nakrem 2017, sp. nov. |
title_fullStr |
Sassenfjordia sassenfjordensis Nakrem 2017, sp. nov. |
title_full_unstemmed |
Sassenfjordia sassenfjordensis Nakrem 2017, sp. nov. |
title_sort |
sassenfjordia sassenfjordensis nakrem 2017, sp. nov. |
publishDate |
2017 |
url |
https://zenodo.org/record/6009597 https://doi.org/10.5281/zenodo.6009597 |
long_lat |
ENVELOPE(164.550,164.550,-71.217,-71.217) ENVELOPE(16.217,16.217,78.412,78.412) |
geographic |
Dockery Sassenfjorden Svalbard |
geographic_facet |
Dockery Sassenfjorden Svalbard |
genre |
Sassenfjord* Sassenfjorden Svalbard |
genre_facet |
Sassenfjord* Sassenfjorden Svalbard |
op_source |
Gastropods from the Late Jurassic - Early Cretaceous seep deposits in Spitsbergen, Svalbard, pp. 351-374 in Zootaxa 4329(4) 362 |
op_relation |
info:eu-repo/semantics/altIdentifier/url/http://treatment.plazi.org/id/B5525419D02BFFFCFF7BFE93FD36FA9B doi:10.11646/zootaxa.4329.4.3 http://zenodo.org/record/1003014 http://publication.plazi.org/id/496B2C61D020FFF7FFECFFDFFF9BFFD5 doi:10.5281/zenodo.1003026 http://zoobank.org/A0552Ffb-Fe2B-4Fad-809A-A1274Ac86Bcc doi:10.5281/zenodo.6009596 https://zenodo.org/communities/biosyslit https://zenodo.org/record/6009597 https://doi.org/10.5281/zenodo.6009597 oai:zenodo.org:6009597 |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/publicdomain/zero/1.0/legalcode |
op_doi |
https://doi.org/10.5281/zenodo.600959710.11646/zootaxa.4329.4.310.5281/zenodo.100302610.5281/zenodo.6009596 |
_version_ |
1766188150849273856 |