Deroceras (Deroceras) maasseni Wiktor, 1996
Morphology:
External: Black body with lighter sides and mantle edges; pale sole (Wiktor 1996).
Internal: Glandular wall on side of penis base; vas deferens, penial retractor muscle, and gland on penis apex; 3-4 branch penial gland, with small papillae; circular conical penial stimulator; small rectal caecum (Wiktor 1996).
Size:
Preserved: 21 mm long, 4 mm wide, mantle 8.5 mm long (Wiktor 1996). .