Bathybembix, Crosse, 1892

Hansen, Thomas, 2019, Gastropods from the Cretaceous-Palaeogene boundary in Denmark, Zootaxa 4654 (1), pp. 1-196 : 69

Bathybembix ? sp.

Fig. 21I

Material. Specimen MGUH 33101, a natural mould of parts of the last whorl.

Occurrence. The specimen comes from the lithified top of the Maastrichtian Højerup Member, Tor Formation, in Holtug Quarry.

Description. Last whorl convex with at least four sharp, beaded spiral ribs interconnected by oblique, discontinuous and sharply narrow transverse cords. Beading on keel rib spiny, becoming less pronounced on base ribs and adapical rib. Beading on adapical spiral rib much finer and more densely spaced than following ribs.

Measurements. The whorl fragment is 3.65 mm wide.

Remarks. The sculpture and whorl profile is very similar to that of the extant Bathybembix bairdii ( Dall, 1889) , which is why the present taxon is tentatively assigned here in spite of a current oldest generic record from the late Eocene (see Hickman & McLean 1990). Better material, though, may still lead to a reassignment to Solariella or perhaps Pareuchelus .

Figures

FIGURE 21. A–B. Leptomaria meyeri Pacaud, 2004. Silicone cast and inner mould of MGUH 33097. Width of cast 14.5. Width of inner mould 11.4 mm. C–H. Bathrotomaria jakobseni n. sp. C–F. Silicone cast and inner mould of holotype MGUH 33098. Width of exposed shell 21.3, 21.3, 15.6, 17.3 mm respectively. G. Outer mould of paratype MGUH 33099. Preserved radius 4.4 mm. H. Silicone cast of last whorl of paratype MGUH 33100. Width 16.2 mm. I. Bathybembix? sp., Silicone cast of MGUH 33101. Width 3.65 mm. J–K. Danilia sp., Silicone cast of MGUH 33102. Width 1.25 mm. L–Q. Chilodonta rudis (Binkhorst, 1861). L–M. Silicone cast of MGUH 33103. Width 6.0 mm for complete specimen, 0.25 mm for protoconch. N–O. Silicone cast of MGUH 33104. Width 7.35 mm. P. Silicone cast of aperture MGUH 33105. Height 4.8 mm. Q. Silicone cast of MGUH 33106. Width 4.65 mm. R–T. Eucycloscala gracilicostatus n. sp. R. Silicone cast of paratype MGUH 33107. Width of fragment 1.3 mm. S–T. Silicone cast of holotype MGUH 33108. Width 2.3 mm. U. Phorcus sp., Silicone cast of MGUH 33109. Height 3.2 mm, exposed width 2.2 mm.