Volutomitra quinqueplicata Ravn 1902
| Autor: | Hansen, Thomas |
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| Rok vydání: | 2019 |
| Předmět: | |
| DOI: | 10.5281/zenodo.5582924 |
| Popis: | Volutomitra cf. quinqueplicata Ravn, 1902 Fig. 31O Material. MGUH 33269, consisting of mould and replaced shell, is the only available specimen from the studied interval. Occurrence. The described specimen comes from the Cerithium Limestone Member at Holtug Quarry, Stevns Klint. Undoubted Volutomitra quinqueplicata Ravn is known from the middle Danian Coral Limestone of Faxe in Denmark (Fig. 31P). Description. Shell very slender, turriculid with high flattened whorls, whorl height corresponding to approximately 70 % of the width. Suture narrow but distinct. Transition to weakly convex base very gradual. Teleoconch surface smooth except for nearly orthogonal, very weakly opisthocyrt growth lines. Measurements. MGUH 33269 consists of the last 2 ½ teleoconch whorls and measures 30.9 mm in height and at least 11.6 mm in width. Remarks. The very fragmentary material lacking apex and aperture makes the assignment somewhat tentative. The large and slender shell with its fairly weakly convex and smooth whorls covered by nearly orthogonal growth lines is on the other hand fairly distinctive for at least this genus among the early Palaeocene gastropods of Denmark. Published as part of Hansen, Thomas, 2019, Gastropods from the Cretaceous-Palaeogene boundary in Denmark, pp. 1-196 in Zootaxa 4654 (1) on page 144, DOI: 10.11646/zootaxa.4654.1.1, http://zenodo.org/record/3365803 {"references":["Ravn, J. P. J. (1902) Molluskerne i Danmarks Kridtaflejringer. II, Scaphopoder, Gastropoder og Cephalopoder. Det Kongelige Danske Videnskabernes Selskab Skrifter, 6. Raekke, Naturvidenskabelig og Mathematisk Afdeling XI, 4, 205 - 270, pls. 1 - 5."]} |
| Databáze: | OpenAIRE |
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