Seila selsoifensis Marquet, 2001

Seila selsoifensis Marquet, 2001

( Fig. 6B View FIG 1-B View FIG 4 View FIG )

Seila (S.) selsoifensis Marquet, 2001: 196 , pl. 2, figs 5-6.

MATERIAL AND DIMENSIONS. — Maximum height 4.2 mm, width 1.5 mm. Paratypes RGM.394128 (2), leg. AWJ. Other material: RGM.1364909 (1), leg. WG ; RGM.1364978 (90+) leg. ACJ ; RGM.1365180 (1), leg. ACJ ; RGM.1365075 (100+) leg. AWJ .

ORIGINAL DESCRIPTION. — “Shell small, turriculate, rather broad, with an apical angle of more than 25°, consisting of eight whorls. Protoconch paucispiral, large (broader than first teleoconch whorl), smooth, very tumid, consisting of only one whorl. Teleoconch whorls tumid for genus. Sculpture starting with axial ribs and two abapical spirals. Third, adapical spiral starting one whorl later and always remaining weaker than both other spirals. Spiral ribs about as broad as intercostal areas. Axial ribs strong, clearly delimited, about as broad as the intercostal spaces, widely spaced, 24 to 30 in number on the middle whorls. Suture deep. Shell base smooth, convex, without additional spirals; aperture nearly square; siphonal canal rather long for genus”. ( Marquet 2001: 196).

DISTRIBUTION. — Lower Pleistocene: Atlantic, endemic to Selsoif, NW France ( Marquet 2001).

REMARKS

This endemic species is quite unlike its European Atlantic and NSB congeners in being much squatter and having a wider apical angle. For full discussion see Marquet (2001: 196).