Dikoleps cutleriana (Clark, 1849)

(Fig. 5B 1-B 3)

Skenea cutleriana Clark, 1849: 424 .

Dikoleps cutleriana – Ceulemans et al. 2016: 73, pl. 10, fig. 1. — Landau et al. 2017: 142, pl. 66, fig. 1.

For more, see synonymy list in Ceulemans et al. (2016).

MATERIAL AND DIMENSIONS. — Maximum height 5.4 mm, width 3.9 mm. — RGM.1365319 (47), leg. AWJ; RGM.1365303 (1), leg. AWJ; RGM.1365300 (2), leg. AWJ; RGM.1365301 (29), leg. AWJ; RGM.1365302 (15), leg. AWJ .

SPECIES CHARACTERISATION. — Small depressed skeneimorph shell; protoconch of one smooth whorl; teleoconch of two whorls separated by deep suture; sculpture of fine spiral cords that continues inside the deep umbilicus.

DISTRIBUTION. — Upper Miocene: Atlantic, NW France (Landau et al. 2017). — Lower Pliocene: NSB, Luchtbal Member, Belgium (Marquet & Landau 2006); Atlantic, NW France (Ceulemans et al. 2016). — Lower Pleistocene: Atlantic, Selsoif, France (this paper). Today this species is present from the Atlantic SW England (Fretter & Graham 1977) to southwards into the Mediterranean, Corsica (Van Aartsen et al. 1984).

REMARKS

There is some variation in shape in the specimen from Selsoif, some slightly more depressed than others and in some specimens the last portion of the last whorl is slightly disjunct. Dikoleps marianae Rubio, Dantart & Luque, 1998, from the Mediterranean Sea resembles D. cutleriana in having the teleoconch covered in fine spirals, even finer than those of D. cutleriana (40 vs 30; fide Rubio et al. 2004: 131) but the protoconch is rugose rather than smooth.