Aclis walleri Jeffreys, 1867

Bouchard, Blanche, Wesselingh, Frank P., Pouwer, Ronald & Landau, Bernard, 2025, The Gelasian gastropod fauna of Selsoif (Manche, France), Geodiversitas 47 (3), pp. 39-91 : 66

Aclis walleri Jeffreys, 1867

( Fig. 10E 1-E 3 )

Aclis walleri Jeffreys, 1867: 105 . — Harmer 1925: 869, pl. 65, fig. 25. — Van Regteren Altena et al. 1955: 21, fig. 78. — Menkhorst & Wesselingh 2018: 43, fig. 15.

Alvania ascaris – Wood 1848: 99, pl. 12, fig. 11 [non Aclis ascaris ( Turton, 1819) ].

MATERIAL AND DIMENSIONS. — Maximum height 2.4 mm, width 1.1 mm. — RGM.1365001 (1), leg. ACJ .

SPECIES CHARACTERISATION. — Small, smooth, turriform shell with relatively broad apical angle. Protoconch missing. Up to six low, convex teleoconch whorls separated by deep suture; smooth, somewhat flattened base; aperture incomplete.

DISTRIBUTION. — Lower Pliocene: NSB, Coralline Crag, England ( Wood 1848; Harmer 1925). — Lower Pleistocene: Atlantic, Selsoif, NW France (this paper). — Upper Pleistocene: NSB, Netherlands ( Van Regteren Altena et al. 1955; Menkhorst & Wesselingh 2018). Today this species occurs from Iceland to Spain ( Bouchet & Warén 1986), Azores ( Hoffman & Freiwald 2020).

Figures

FIG. 10. — 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 (continuation): A, Calyptraea chinensis s.l. (Linnaeus, 1758), RGM.1365194, leg ACJ, H = 3.2 mm; B, Crepidula gibbosa Defrance, 1818, RGM.1365185, leg AWJ, H = 3.3 mm; C, Capulus ungaricus (Linnaeus, 1758), RGM.1365200, leg AWJ, H = 12 mm; D, Aclis minor (Brown, 1827), RGM.1365257, leg AWJ, H = 1.79 mm; E, Aclis walleri Jeffreys, 1867, RGM.1365001, leg ACJ, H = 2.33 mm; F, Melanella alba (da Costa, 1778), RGM.1365318, leg AWJ, H = 5.96 mm; G, Velutina aff. velutina (Müller, 1776), RGM.1365186, leg AWJ, H = 3.27 mm; H, Trivia coccinelloides (J. de C. Sowerby, 1822), RGM.1365272, leg WG, H = 7.7 mm; I, Trivia coccinelloides (J. de C. Sowerby, 1822), RGM.1365271, leg WG, H = 6.38 mm; J, Trivia coccinelloides (J. de C. Sowerby, 1822), RGM.1365203, leg WG, H = 6.7 mm. Scale bars: A, B, G, 1 mm; C, F, H-J, 2 mm; D, E, 500 μm.

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. 3. — Simplified biographic map of South-West of Europe (after Landau et al. 2011).