Neogastropoda, Wenz, 1938

Hansen, Thomas, 2019, Gastropods from the Cretaceous-Palaeogene boundary in Denmark, Zootaxa 4654 (1), pp. 1-196 : 160

Neogastropoda genus et sp. indet.

Figs 34 H–I

Material. Specimen MGUH 33301 consists of an external and part of an internal mould.

Occurrence. Lithified top of the Maastrichtian Højerup Member at Rødvig, Stevns Klint.

Description. Protoconch conical, multispiral, nearly 0.7 mm high and 0.7 mm wide, consisting of around 3 ½ weakly convex and smooth whorls. Suture moderately impressed.

Teleoconch weakly to moderately convex with gradual transition to base. Aperture and possible canal not preserved. Teleoconch sculpture consisting of fine spiral striae, the most adapical slightly stronger than succeeding ones. Growth lines appearing nearly orthogonal.

Measurements. MGUH 33301 is 1.55 mm high and 0.9 mm wide, consisting of 4 ¼ whorls.

Remarks. The fragmentary and sparse material makes a more precise taxonomical assignment of this species very dubious at best. The nearly orthogonal growth lines, the multispiral protoconch and the seeming lack of transverse teleoconch sculpture may suggest a possible connection to the family Buccinidae . It superficially resembles the young shell of Orthosurcula s.l. cerithiorum ( Ravn, 1902) treated above, but differs by the growth line pattern and by the slightly smaller size of the protoconch.

Figures

FIGURE 34. A–E. Admetula sp. A–D. Silicone cast and internal mould of MGUH 33297. Widths 6.6, 7.2, 7.0 and 6.1 mm respectively. E. Internal mould of MGUH 33298. Width 5.6 mm. F. Kroisbachia sp., Silicone cast of MGUH 33299. Width 2.4 mm. G. Mataxa s.l. sp., Silicone cast of MGUH 33300. Width 3.9 mm. H–I. Neogastropoda genus et sp. indet., Silicone cast of MGUH 33301. Width 0.7 mm. J–N. Ravniella danica (Ravn, 1902). J–K. Silicone cast of MGUH 33202. Widths 4.7 and 4.3 respectively. L. Silicone cast of lectotype MGUH 126. Width 4.3 mm. Photograph by S.L. Jakobsen. M–N. Silicone cast of MGUH 33303. Width 4.1 and 3.8 mm. O–S. Disculus selandicum (Ravn, 1902). O. Silicone cast of MGUH 33304. Width 8.7 mm. P–Q. Silicone cast of paralectotype MGUH 80 figured by J.P.J. Ravn (1902, Pl. I: 6). Width 7.1, 6.9 mm respectively. R. Silicone cast of lectotype MGUH 79. Width 6.0 mm. Photograph by S.L. Jakobsen. S. Silicone cast of MGUH 33305. Width 5.9 mm.