Caecum glabrum

Caecum glabrum (Montagu, 1803) (Fig. 9E) Dentalium glabrum Montagu, 1803: 197. Caecum glabrum – Van Dingenen et al. 2016: pl. 11, fig. 5. For more, see synonymy list in Van Dingenen et al. (2016). MATERIAL AND DIMENSIONS. — Maximum length 1.1 mm. — RGM.1365099 (52), leg. AWJ; RGM.1365191 (1), leg. AWJ. SPECIES CHARACTERISATION. — Small, elongate, smooth shell. Dome-shaped apical septum. DISTRIBUTION. — Middle Miocene: Loire Basin, France (Glibert 1949). — Lower Pliocene: Atlantic, NW France (Van Dingenen et al. 2016); NSB, Coralline Crag, England (Wood 1848; Harmer 1923). — Upper Pliocene: NSB, Red Crag, England (Harmer 1923); Oorderen Sands, Belgium (Marquet 1997). — Lower Pleistocene: Atlantic, Selsoif, NW France (this paper); central Mediterranean, Italy (Cerulli-Irelli 1912). — Pleistocene (indeterminate): Atlantic, British Isles (Harmer 1923); NSB, The Netherlands (Van Regteren Altena et al. 1955). — Holocene: NSB (Strand Petersen 2004). Today this species occurs at the Atlantic coasts of Europe from British Isles to the Bay of Biscay (Fretter & Graham 1978). Mediterranean records are not C. glabrum, but C. subannulatum de Folin, 1870 or C. auriculatum de Folin, 1868; Van Aartsen 1977: 11).