Solariella, Wood, 1842

Hansen, Thomas, 2019, Gastropods from the Cretaceous-Palaeogene boundary in Denmark, Zootaxa 4654 (1), pp. 1-196 : 72-74

Solariella sp.

Figs 22 D–F

2014 Solariella sp. Hansen & Surlyk: tab. 3.

Material. MGUH 33111, MGUH 33112, ØSM.10042-272-a and an external mould of spire without number in the collections of the Natural History Museum of Denmark.

Occurrence. Top Højerup Member of the Maastrichtian Tor Formation at Rødvig, Højerup, Holtug Quarry and north of Harvig Stige at Stevns Klint, Denmark.

Description. Protoconch smooth with deep sutures and a moderately high spire with two or three whorls. Teleoconch whorls broadly convex, angular with strong and sharp spiral cords, three of which form a wide obsolete keel; collabral threads or ridges very faint on older whorls, becoming more pronounced on later whorls. Upper suture situated between second and third keel rib of preceding whorl. Base and aperture unknown.

Measurements. Largest shell approximately 6.5 mm wide and 4.8 mm high.

Remarks. This taxon differs from S. ladrierei ( Briart & Cornet, 1887) and S. multilineata ( Briart & Cornet, 1887) from the Danian of Belgium by the more angular whorls with their coarser spiral cords and by the presence of distinct collabral ribs. It is distinguished from S. vincenti Cossmann, 1915 by the larger number of spiral ribs and less stepped spire and from S. briarti (Vincent in Cossmann 1915) , also from the Danian of Belgium, by the more keeled outline of the whorl with its stronger collabral threads.

Figures

FIGURE 22. A. Phorcus sp., Silicone cast of MGUH 33109. Exposed width 2.2 mm. B–C. Stomatella sp., External mould of MGUH 33110. Figure B has been colour inverted and mirrored to show it in positive. Width 1.5 mm. D–F. Solariella sp. D–E. Silicone cast of MGUH 33111. Width 6.2 mm. F. Silicone cast of aperture of MGUH 33112. Width 5.95 mm. G–I. Skenea sp. G–H. Inner mould of MGUH 33113. Width 5.2 mm. I. Inner mould of MGUH 33114. Width 10.2 mm. J–K. Leucorhynchia sp., Silicone cast of MGUH 33115. Width 2.4 mm. L–N. Tectus? indecorus n. sp., L. Umbilical view of inner mould of paratype ØSM.10042-327-b. Width 19.7 mm. M–N. Silicone cast of holotype MGUH 33116. Width 1.7 mm. O–P. Homalopoma sp., Silicone cast and inner mould of MGUH 33117. Width 9.6, 6.9 mm respectively. Q. Calliomphalus (Calliomphalus) sp., Silicone cast of MGUH 33118. Width 3.1 mm. R–U. Arene jakobseni n. sp. R–T. Silicone cast of holotype MGUH 33119. Width 8.6 mm. U. Silicone cast of paratype MGUH 33120. Width of aperture 4.8 mm.