Deroceras (Deroceras) giustianum Wiktor, 1998
Morphology:
External: Thick-bodied; slug evenly black, sides may get paler downwards; ring around pneumostom lighter; sole with dark lateral zones, medial zone creamy.
Internal: Penis oval or spherical, with a long and vermiform appendix of variable shape and a dark elongated pigment streak in its posterior section; penial gland composed of a distinct shaft and several long processes with some papillae, looks like an octopus; retractor unforked; stimulator thin and cone-shaped.
Size:
Up to 43 mm long (preserved).
Distribution:
Italy: Sicilia.
Type Locality: Italy: Sicilia, Erice near Trapani.
Habitat:
Nothing known on habitat and ecology.