Gastropods from the Cretaceous-Palaeogene boundary in Denmark Author Hansen, Thomas text Zootaxa 2019 2019-08-12 4654 1 1 196 journal article 26049 10.11646/zootaxa.4654.1.1 9ce1d103-9234-4fbe-9544-f1c294bb8783 1175-5326 3365803 CFD82CC0-3110-472E-972B-7ADC0C523A04 Amaea ? sp. C Fig. 30E Material. Specimen ØSM .10042-373 represents a fragmentary external mould of the teleoconch. Occurrence. The taxon belongs to the Maastrichtian Tor Formation and here probably from the basal Højerup Member or the uppermost Sigerslev Member, where it is cut by the early Danian lithified hardground layer in the northern part of Stevns Klint. Description. Protoconch unknown. Teleoconch very slender, turriculate, with strongly convex whorls separated by deep suture; whorls 1.6 times as wide as high. Distinct carina delimiting basal disc just visible above abapical suture. Varices narrow and frequent, tending to appear after every whorl. Teleoconch sculpture reticulate, consisting of more than 30 transverse ribs per whorl, crossed by slightly weak- er spiral threads. Transverse ribs sharp-ridged, opisthocyrt, bending forward adapically; ribs continuing down onto basal disc. Spiral threads close-spaced, numbering around 18 on spire whorls; adapical five to six very weak and closely spaced, succeeding ones stronger, alternating between coarser and finer threads. Connecting points between spirals and transverse ribs marked by weak tubercle. Basal disc covered by fine and closely spaced spiral threads on at least marginal part. Measurements. Specimen ØSM .10042-373 consists of eight teleoconch whorls and measures 20.2 mm in height and more than 6 millimetres in width. Remarks. As pointed out by Squires and Saul (2003b) the high frequency of varices is somewhat unusual for taxa belonging to Amaea . Allowing for the lack of the protoconch this taxon seems in all other respects to belong within this genus to which it is provisionally assigned. Amaea ? sp. C has a strong resemblance to Amaea elegans ( Ravn, 1902 ) from the middle Danian Coral Limestone at Faxe, Denmark . It is readily distinguished by the much finer and close-laying transverse ribs.