Hokkaidoconcha Kaim, Jenkins & Waren 2008 ...
Hokkaidoconcha sp. (Fig. 5I –M) 2015 Hokkaidoconchidae gen. et sp. indet.; Hryniewicz et al. 2015a, table 1. Description. Cerithioid shell with opisthocline to slightly opisthocyrt axial ribs and fine numerous spiral riblets. Whorl flanks are weakly inflated and the suture weakly incised. Protoconch...
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| Format: | Text |
| Language: | unknown |
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Zenodo
2017
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| Online Access: | https://dx.doi.org/10.5281/zenodo.6009563 https://zenodo.org/doi/10.5281/zenodo.6009563 |
| Summary: | Hokkaidoconcha sp. (Fig. 5I –M) 2015 Hokkaidoconchidae gen. et sp. indet.; Hryniewicz et al. 2015a, table 1. Description. Cerithioid shell with opisthocline to slightly opisthocyrt axial ribs and fine numerous spiral riblets. Whorl flanks are weakly inflated and the suture weakly incised. Protoconch and aperture not preserved. Material and occurrence: Three specimens from seep #12, Sassenfjorden, Svalbard; late Berriasian (Early Cretaceous). All illustrated: PMO 217.507, PMO 217.509, PMO 217.511b. Remarks. Hokkaidoconcha sp. is represented by three incompletely preserved juvenile specimens, so several pertinent shell characters could not be observed, and this is the reason why we decided to leave this species in open nomenclature. Our Hokkaidoconcha sp. from Svalbard is most similar to juveniles of the Cenomanian H. tanabei from Japan (Kaim et al. 2008b). The latter species, however, grows to a relatively large size and its ornament changes with ontogeny. Changes in ontogeny could not be observed in ... : 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 358, DOI: 10.11646/zootaxa.4329.4.3, http://zenodo.org/record/1003014 ... |
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