Emarginula fissura ( Linnaeus, 1758 )

Bouchard, Blanche, Wesselingh, Frank P., Pouwer, Ronald & Landau, Bernard, 2025, The Gelasian gastropod fauna of Selsoif (Manche, France), Geodiversitas 47 (3), pp. 39-91 : 47

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).

Figures

FIG. 4. — Gastropods from Selsoif. All illustrated specimens are collected from the Sablière du Grand Marais,Selsoif,France and come from the Early Pleistocene Saint-Nicolas de Pierrepont Formation:A, Patella rustica Linnaeus,1758,RGM.1365190,leg.AWJ,H = 7.6 mm; B, Patella vulgata Linnaeus,1758,RGM.1310830, leg. AWJ, L = 15.14 mm; C, Tectura virginea (Müller, 1776), RGM.1365189, leg. ACJ, L = 4.9 mm; D, Diodora graeca (Defrance, 1820), RGM.1365174, leg. AWJ, L = 15.04 mm; E, Emarginula fissura (Linnaeus, 1758), RGM.1365175, leg. WG, L = 4.6 mm; F, Jujubinus exasperatus (Pennant, 1777), RGM.1365178, leg ACJ, L = 3.5 mm; G, Jujubinus montagui (Wood, 1828), RGM.1365179, leg. AWJ, L = 4.3 mm; H, Steromphala cineraria (Linnaeus, 1758), RGM.1365177, leg. ACJ, L = 8.4 mm; I, Steromphala cineraria (Linnaeus, 1758), RGM.1310831, leg. AWJ, L = 3.6 mm; J, Steromphala tumida (Montagu, 1803), RGM.1310832, leg. SM, L = 4.6 mm; K, Calliostoma normanensis n. sp. (holotype), MNHN.F.A91315, leg. AWJ, L = 8 mm. Scale bars: A, C, D, H, K, 2mm; B, 5 mm; E-G, I, J, 1 mm.

FIG. 1. — Simplified geological map of the Normandy region (after Dugué et al. 2000 and Pareyn 1987) showing the location of Selsoif:1, Precambrian-Palaeozoic basement; 2, Permo-Mesozoic Paris Basin fill; 3, Neogene-Quaternary subbasins.

FIG. 2. — Aerial photographs of the extraction site (La Sablière du Grand-Marais) with the spoil heaps visible in centre: A, photographie IGN, Mission C90SAA0491_1990_F1211- 1411_0037, cliché no. 37, 28/04/1990; B, photographie IGN, Mission CP12000422_059_12385, cliché n°12385, 26/07/2012. Width of lake in the centre c. 400 m.