Hyalogyrina knorringfjelletensis Nakrem 2017
- Dataset
- Gastropods from the Late Jurassic - Early Cretaceous seep deposits in Spitsbergen, Svalbard
- Rank
- SPECIES
- Published in
- Nakrem, Hans Arne (2017): Gastropods from the Late Jurassic - Early Cretaceous seep deposits in Spitsbergen, Svalbard. Zootaxa 4329 (4): 351-374, DOI: 10.11646/zootaxa.4329.4.3
Classification
- kingdom
- Animalia
- phylum
- Mollusca
- class
- Gastropoda
- family
- Hyalogyrinidae
- genus
- Hyalogyrina
- species
- Hyalogyrina knorringfjelletensis
description
2015 Hyalogyrinidae? gen. et sp. indet.; Hryniewicz et al. 2015 a, table 1.
description
Description. Protoconch poorly preserved but apparently hyperstrophic (Fig. 9 G, 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.
diagnosis
Diagnosis. Relatively large low-spired hyalogyrinid with delicate lirate ornamentation on the shell flank.
discussion
Remarks. Hyalogyrina knorringfjelleti differs from other similar taxa, both fossil and modern, in having a relatively large size and delicately ornamented shell flanks, recollecting the ornament seen on the umbilical wall of modern hyalogyrinids (Marshall 1988). Hyalogyrina knorringfjelletensis is strongly reminiscent of Alexogyra Bandel, 1996 (synonymized with Bandellina Schröder, 1995 by Kaim 2004) and modern species of Hyalogyrina Marshall, 1988.
distribution
Distribution: Seeps # 9 and # 12, Sassenfjorden, Svalbard. Late Berriasian, Early Cretaceous. Etymology: After Knorringfjellet, a mountain above the type locality.
materials_examined
Holotype: PMO 217. 511 a, 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. 9 G; PMO 224.763) and one from seep # 12 (Fig. 9 A, F; PMO 217.508); Sassenfjorden, Svalbard; late Berriasian (Early Cretaceous).