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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Zenodo
2017
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| Online Access: | https://dx.doi.org/10.5281/zenodo.6009596 https://zenodo.org/doi/10.5281/zenodo.6009596 |
| Summary: | 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 ... : Published as part of Nakrem, Hans Arne, 2017, Gastropods from the Late Jurassic - Early Cretaceous seep deposits in Spitsbergen, Svalbard, pp. 351-374 in Zootaxa 4329 (4) on page 362, DOI: 10.11646/zootaxa.4329.4.3, http://zenodo.org/record/1003014 ... |
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