Lacuna parva

Lacuna parva (da Costa, 1778) (Fig. 7E 1-E 3) Cochlea parva da Costa, 1778: 85. Turbo puteolus Turton, 1819: 193, figs 90, 91. Lacuna puteolus – Harmer 1921: 666, pl. 53, fig. 26. Lacuna parva – Fretter & Graham 1980: 248, figs 199-200. — Moerdijk & Janse 2015: 22, fig. 10. MATERIAL AND DIMENSIONS. — Maximum height 3.5 mm, width 3.4 mm RGM.1364980 (4), leg. ACJ; RGM.1365183 (1), leg. ACJ. SPECIES CHARACTERISATION. — Small ovate shell. Three smooth, round teleoconch whorls. Last whorl is 77% of total shell. Aperture round with a thick peristome, columella expanded and flattened abapically. Broad umbilical chink. DISTRIBUTION. — Lower Pleistocene: Atlantic, Selsoif, NW France (this paper). — Lower and Upper Pleistocene: England and Ireland (Harmer 1921). — Upper Pleistocene: Netherlands (Wolf 2001). — Holocene: NSB (Strand Petersen 2004). Today predominantly a northern species extending from south of the Arctic Circle on the American coast to Cape Cod, in the eastern Atlantic British Isles, Norway, Sweden (Fretter & Graham 1980), North Sea of Belgium (Backeljau 1986). The species is associated with algae such as Fucus below the low water tide line (e.g., Ockelmann & Nielsen 1981).