Acteon cf. pinguis d’Orbigny, 1852

(Fig. 7 B1, B2)

cf. Acteon pinguis d’Orbigny, 1852: no. 521, 36. — Peyrot 1932: 157, no. 1376, pl. 11, figs 55-57, pl. 14, figs 12, 13. — Lozouet et al. 2001: 79. — Harzhauser 2002: 125, pl. 12, fig. 7.

MATERIAL EXAMINED. — Sample F10: AMPG (IV) 2479-2481 (three specimen); sample F11: AMPG (IV) 2482, 2483 (two specimens); sample F12: AMPG (IV) 2484-2487 (four specimens) .

DIMENSIONS. — Maximum height: 1.85 mm.

DISTRIBUTION. — Early Miocene. Aquitanian. NE Atlantic: France (Aquitaine Basin) (Peyrot 1932; Lozouet et al. 2001); Proto-Mediterranean: Greece (this paper). — Burdigalian. NE Atlantic: France (Aquitaine Basin) (Peyrot 1932); Paratethys: Austria (Harzhauser 2002).

DESCRIPTION

Juvenile and incomplete specimens with intorted smooth protoconch.Apical angle of 55°.Two teleoconch whorls, sculpture typi- cal with regularly-spaced pitted grooves, suture deeply impressed; aperture tear-drop shaped, no umbilicus, outer lip regularly convex.

REMARKS

A single species of ‘ Acteon ’ has been found, represented mainly by juveniles. The sculpture, apical angle coincide with those of A. pinguis but the juvenile and incomplete specimens does not allow a clear identification. Variation in sculpture consists of the grooves that bear less prominent pits and have a smoother aspect abapically. The last whorl of the specimens observed has slightly deeper grooves which could possibly be a feature dominating the sculpture of later whorls.

The shape of the shell and the convexity of the whorls are reminiscent of Acteon semistriatus (Férussac, 1822) . The sculpture and overall morphology of the recovered specimens is most similar to A. pinguis d’Orbigny, 1852 . Nevertheless, the protoconch seems slightly wider and less inflated, which could be due to intraspecific variability. Moreover, specimens recovered show various traces of predation from molluscs and possibly decapods.