Cocculina, Dall, 1882

Hansen, Thomas, 2019, Gastropods from the Cretaceous-Palaeogene boundary in Denmark, Zootaxa 4654 (1), pp. 1-196 : 58

Cocculina ? sp.

Figs 19 F–G

Material. MGUH 33081, a fragmentary mould of outer surface.

Occurrence. Bay at Boesdal at Stevns Klint, where it was collected from the lower Danian Cerithium Limestone Member of the Rødvig Formation.

Description. Protoconch narrow, smooth, not immersed in posterior slope of teleoconch. Teleoconch short ovate in outline, fairly high with nearly straight to slightly concave posterior slope and gently convex anterior slope; lateral flanks nearly straight. No sculpture except for some faint growth lines.

Measurements. Height of shell approximately 3.3 mm, width at least 5.3 mm.

Remarks. This species closely resembles Cocculina s.l. sp. sensu Kiel (2006) from the Albian of Madagascar with its smooth shell, but may differ in having a relatively higher and less elongated shell with a slightly smoother surface. From all other species of Cocculina it differs in its smooth protoconch and teleoconch, though specimens with nearly smooth shell belonging to the Miocene Cocculina dittmeri ( Anderson, 1964) from Northern to Central Europe have been observed (see Janssen 1984).

Figures

FIGURE 19. A–C. Acmaea selandica n. sp. A. Inner mould of holotype MGUH 33077. Length 5.9 mm. B. Paratype MGUH 33078. Length 2.6 mm. C. Internal mould of paratype MGUH 33079. Length 4.45 mm. D–E. Acmaea? sp. Wax cast of now lost specimen MGUH 33080. Length 19.7 mm. F–G. Cocculina? sp. Silicone cast of MGUH 33081. Exposed length 5.7 mm. H. Symmetrocapulus? sp., external mould MGUH 33082. Length 2.4 mm. I–K. Emarginula coralliora Lundgren, 1867. I–J. Silicone cast of MGUH 33083. Length 2.9 mm, height 1 mm. K. Inner mould of MGUH 33084. Length 7.8 mm. L–Q. Cranopsis cretacea n. sp. L–O. Silicone cast and inner mould of holotype MGUH 33085. Length 3.6 mm, width 2.6 mm. P–Q. Silicone cast and inner mould of paratype MGUH 33086. Length 2.1 mm. R–S. Palaeoloxotoma sp., Silicone cast of MGUH 33087. Length 17.2 mm.