Roxania, Leach in Gray, 1847

Hansen, Thomas, 2019, Gastropods from the Cretaceous-Palaeogene boundary in Denmark, Zootaxa 4654 (1), pp. 1-196 : 168-169

Roxania sp.

Figs 35 Z–AE, 36A–C

Material. MGUH 33323, MGUH 33324 and two external and internal moulds found in sample SR.394 collected for this study.

Occurrence. Cerithium Limestone Member at Rødvig, between Knøsen and first ladder at Harvig, Højerup and Barmhjertigheden, Stevns Klint.

Description. Protoconch unknown. Teleoconch deeply involute, with inflated, rounded whorls and a spire completely hidden or at most visible through a very narrow opening. Width of penultimate whorl corresponding to nearly 75 % of shell width. Aperture higher than last whorl, nearly twice as wide abapically as on moderately narrow apical half. Inner lip with distinct callus and a relatively well defined columella with weak columellar fold.

Teleoconch sculpture consisting of more than 50 fairly distinct spiral grooves on largest specimen. Grooves not pitted.

Measurements. Largest specimen, MGUH 33323, 3.6 mm wide and about 5.1 mm high.

Remarks. This taxon differs from the early Paleocene Roxania raristriata ( Briart & Cornet, 1887) from Belgium and the early Paleocene Roxania clausa ( von Koenen, 1885) from Denmark by the rather rounded outline, wider aperture and a denser spiral striation.

Figures

FIGURE 35. A–B. Pseudomalaxis sp., Silicone cast of MGUH 33306. Width 4.3 mm. C–D. Climacopoma? sp., Silicone cast of MGUH 33307. Width 13.1 and 9.9 mm respectively. E–I. Mathilda dania n. sp. E. Silicone cast of holotype MGUH 33308. Width 1.9 mm. F. Silicone cast of paratype MGUH 33309. Width 2.0 mm. G. Silicone cast of paratype MGUH 33310. Width 0.8 mm. H. Silicone cast of paratype MGUH 33311. Width 0.7 mm. I. Silicone cast of paratype MGUH 33312. Width 1.7 mm. J–K. Clathrobaculus sp., Silicone cast of MGUH 33313. Width 0.5 mm. L–P. Ringicula sp. L. Silicone cast of MGUH 33314. Width 7.0 mm. M–N. Silicone cast of MGUH 33315 and a partly hidden second specimen. Width 7.3 and 6.6 mm respectively. O–P. Silicone cast of MGUH 33316. Width 5.6, 5.3 mm respectively. Q–T. Cylichna stevniensis n. sp. Q. Silicone cast of holotype MGUH 33317. Width 1.4 mm. R–S. Internal mould of paratype MGUH 33318. Width 1.5 mm. T. Internal mould of paratype MGUH 33319. Width 2.8 mm. U–V. Cylichna? sp. A. Cast of MGUH 33320. Width 2.3, 2.4 mm respectively. W–Y. Cylichna? sp. B. W. Wax cast of MGUH 33321. Width 2.4 mm. X–Y. Inner mould of MGUH 33322. Width 1.3 mm. Z–AE. Roxania sp. Cast of MGUH 33323. Width 3.2, 3.3 mm respectively.