Emarginula fissura

Emarginula fissura (Linnaeus, 1758) (Fig. 4E 1, E 2) Patella fissura Linnaeus, 1758: 78 Emarginula fissura – Harmer 1923: 776, pl. 62, fig. 7. — Wesselingh & Pouwer 2011: 135, fig. 12. — Chirli & Linse 2011: 31, pl. 1, fig. 2. — Ceulemans et al. 2016: 57, pl. 2, fig. 2. — Brunetti & Cresti 2018: 30, fig. 19. Emarginula fissura var. depressa – Harmer 1923: 777, pl. 62, fig. 8. For more, see synonymy list in Ceulemans et al. (2016). MATERIAL AND DIMENSIONS. — Maximum height 8.3 mm, diameter 11.7 mm. — RGM.1364900 (2), leg. WG; RGM.1364901 (5), leg. WG; RGM.1365175 (1), leg. WG, RGM.1364965 (13), leg. ACJ; RGM.1365376 (1), leg. ACJ; RGM.1364966 (73), leg. ACJ; RGM.1364967 (28), leg. ACJ; RGM.1365063 (13), leg. AWJ; RGM.1365064 (13), leg. AWJ; RGM.1365065 (22), leg. AWJ; RGM.1365176 (1), leg. AWJ. SPECIES CHARACTERISATION. — Elevated conical shell; apex placed about two thirds distance from anterior margin, sculpture of alternating primary and secondary ribs, slightly weaker concentric cords forming fine reticulated surface pattern; selenizone narrow, slit extending to one-third shell height. DISTRIBUTION. — Middle Miocene: Loire Basin, France (Glibert 1949). — Upper Miocene: NW France (Brébion 1964; not confirmed byLandau et al. 2017). — Lower and Upper Pliocene: NSB, England (Wood 1848; Harmer 1923), Belgium (Marquet 1998), The Netherlands (Beets 1946); Atlantic, NW France (Ceulemans et al. 2016), Portugal (Silva 1990, 2001); western and central Mediterranean (Fekih 1975; Piani 1984; Cavallo & Repetto 1992; Landau et al. 2003, 2011; Brunetti & Cresti 2018). — Lower Pleistocene: Atlantic, NW France (Brébion 1964), Selsoif, France (this paper); eastern Mediterranean, Rhodes Island (Chirli & Linse 2011). — Pleistocene (indeterminate): central Mediterranean, Italy (Sacco 1896a; Cerulli-Irelli 1916). Today it occurs along the European Atlantic coasts from Scandinavia to the Mediterranean, at a depth between 0 and 700 m (Piani 1984). REMARKS For discussion on the shell variability and comparison with congeners see Ceulemans et al. (2016: 57).