Hyalogyrina knorringfjelletensis Nakrem 2017, sp. nov. ...
Hyalogyrina knorringfjelletensis sp. nov. (Fig. 9) 2015 Hyalogyrinidae? gen. et sp. indet.; Hryniewicz et al. 2015a, table 1. Diagnosis. Relatively large low-spired hyalogyrinid with delicate lirate ornamentation on the shell flank. Holotype: PMO 217. 511a, H = 2.6 mm, W = 4.3 mm. Paratype: PMO 217....
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Zenodo
2017
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| Online Access: | https://dx.doi.org/10.5281/zenodo.6009611 https://zenodo.org/doi/10.5281/zenodo.6009611 |
| Summary: | Hyalogyrina knorringfjelletensis sp. nov. (Fig. 9) 2015 Hyalogyrinidae? gen. et sp. indet.; Hryniewicz et al. 2015a, table 1. Diagnosis. Relatively large low-spired hyalogyrinid with delicate lirate ornamentation on the shell flank. Holotype: PMO 217. 511a, H = 2.6 mm, W = 4.3 mm. Paratype: PMO 217.510, W = 5.2 mm. Type locality and age: Seep #12, Sassenfjorden, Svalbard; late Berriasian (Early Cretaceous). Other material: Two specimens, both illustrated. One from seep #9 (Fig. 9G; PMO 224.763) and one from seep #12 (Fig. 9A, F; PMO 217.508); Sassenfjorden, Svalbard; late Berriasian (Early Cretaceous). Description. Protoconch poorly preserved but apparently hyperstrophic (Fig. 9G, H). Shell turbinateskeneiform, large for the genus. Teleoconch formed of up to four whorls, strongly and evenly convex and ornamented with delicate lirate ornamentation. Growth lines prosocline. Umbilicus and umbilical wall obscured by rock matrix in available specimens. Aperture sub-circular, complete. Remarks. Hyalogyrina ... : 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 pages 364-365, DOI: 10.11646/zootaxa.4329.4.3, http://zenodo.org/record/1003014 ... |
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