Oxychilus cellarius (O. F. Müller, 1774 )

Oxychilus cellarius (O. F. Müller, 1774) View in CoL

Fig. 6 View Figure 6

Worldwide distribution.

Originally described from a wine cellar in Copenhagen ( Müller 1774). Its native range includes northern and western Europe ( Horáčková and Juřičková 2009), Asia Minor, and North Africa ( Roth and Sadeghian 2003). It has been introduced into Tasmania ( Kershaw 1991), Greenland, North America ( Forsyth 2004), St Helena, South Africa, Chile ( Stuardo and Vega 1985), Hawaii ( Cowie 1997), Australia and New Zealand ( Barker 1999).

Distribution in Mexico.

CDMX (Tlalpan).

Diagnostic features.

Two specimens were dissected. The penis is cylindrical with a relatively constant width in the middle portion (Fig. 6 D, G View Figure 6 ). Internally the proximal penis shows small, evenly distributed papillae that tend to be joined together in rows which occasionally form undulating folds (Fig. 6 F, I View Figure 6 ). The distal penis presents four, thin, internal folds (Fig. 6 E, H View Figure 6 ).

Shell discoidal, flattened, convex (Fig. 6 C View Figure 6 ), light yellowish in color with fine lines of radial growth (Fig. 6 A View Figure 6 ). Shell whorls: 4 ½ – 5. Umbilicus slightly flared, ~ 1 / 12 of maximum shell diameter (Fig. 6 B View Figure 6 ). Shell dimensions: 8–10 mm diameter, 4 mm height (Fig. 7 View Figure 7 ). Aperture width 3–4 mm.

Radula (n = 2) composed of 35 rows with ~ 25 teeth / row (Fig. 8 C View Figure 8 ). Radular formula: C / 3 + 2–3 L / 3 + 0–1 LM / 2 + 9–14 M / 1.