Polinices, Montfort, 1810

Hansen, Thomas, 2019, Gastropods from the Cretaceous-Palaeogene boundary in Denmark, Zootaxa 4654 (1), pp. 1-196 : 94

Polinices sp. A

Figs 25 J–N

Material. MGUH 33158 and MGUH 33159 . 39 specimens are found in the unofficially catalogued samples: SH.103. A, SH.104.B, SH.106.A–B, SH.140.B, SH.142, SH.158, SH.174, SH.188.A–C, SH.204, SH.205, SH.218, SH.285. A–B, SH.288, SH.290 (2 specimens), SH.303.A, SH.324, SH.410.A–B, SH.470, SR.364, SR.389.A–B, SR.404, SR.477, SR.493, SR.501, SR.523, SR.574, SR.575, SR.576.A–B, SR.588.A–B, SR.609, SR.616, SR.641, SR.643. A–B, SR.644, SR.650, SR.651, SR.652 and SR.668.A–B. A final 14 fragmentary external and internal moulds without numbers are located in the uncatalogued old collections at the Natural History Museum of Denmark .

Occurrence. Lower Danian Cerithium Limestone Member and basal Korsnaeb Member at Stevns Klint. It furthermore occurs in the lower Danian ‘dead layer’ at Vokslev, Northern Jutland.

Description. Protoconch low-spired, but poorly preserved on available material.

Teleoconch ovoid turbiniform and moderately low-spired with slightly adpressed and moderately convex whorls separated by distinct suture. Aperture semicircular and distinctly oblique to axial line. Umbilical opening narrow, partly covered by moderately thick, subtriangular callus. Surface smooth except for more or less straight, prosocline growth lines.

Measurements. Largest specimen 8.9 mm wide, but most specimens reaches sizes of only a few millimetres.

Remarks. The shape of the shell varies somewhat from forms with a strong ear-shape and fairly flattened spire whorls to those with a more stepped outline somewhat resembling Natica sp. A described above.

Figures

FIGURE 25. A–G. Natica sp. A. A–B. Silicone cast of MGUH 33154. Width 7.9 mm. C–D. Silicone cast of MGUH 33155. Width 1.4 mm. E–G. Silicone cast of MGUH 33156. Width 2.1 mm. H–I. Natica sp. B. Silicone cast of MGUH 33157. Width 2.3 mm. J–N. Polinices sp. A. J–L. Silicone cast of MGUH 33158. Width 3.0 mm. M–N. Silicone cast of MGUH 33159. Width 5.2 mm. O–P. Polinices? sp. B. Silicone cast of MGUH 33160. Width 5.0 mm. Q–R. Rissoina? sp., Silicone cast of MGUH 33161. Width 0.6 mm. S–U. Zebinella selandica n. sp., Silicone cast of holotype MGUH 33162. Width 0.8 mm. Width of protoconch 0.55 mm. V. Alvania sp. A. Silicone cast of MGUH 33163. Width 1.2 mm.