Zebina H. Adams & A. Adams 1854

Zebina sp.

Fig. 26D

Material. Specimen MGUH 33166 is an external mould.

Occurrence. The specimen was found in the Cerithium Limestone Member, 52–62 cm above the K-Pg boundary at Rødvig, Stevns Klint.

Description. Spire blunt with smooth and flatly dome-shaped protoconch consisting of 1 ½ convex whorls; transition to teleoconch rather gradual. Teleoconch with fairly high whorls, the first being rather weakly convex, the following becoming more convex with increasingly steeply inclined flanks. Suture distinct but not deep. Aperture narrow, obliquely lenticular with a weakly developed anterior apertural channel; aperture height approximating 40 % of shell height, the width corresponding to just over 60 % of height.

Measurements. Minute gastropod, MGUH 33166 is 2.0 mm high and 0.9 mm wide and consists of approximately 5 ½ whorls, protoconch included.

Remarks. Zebina sp. is distinguished from most species belonging to this genus by the unusually well developed anterior apertural channel and strongly rounded base. It has a passing resemblance to the Early Cretaceous Zebina dziki Kaim, 2004 from Poland, but differs by the thinner shell, the rounded base and the narrow aperture. It differs from the mid Danian Zebina sp. 1 and Zebina sp. 2 sensu Lauridsen & Schnetler (2014) from Denmark by the relatively broader apex and narrow aperture with developed channel.