Deroceras vascoana is a species of air-breathing land slug in the family Agriolimacidae.

Collected specimens are 2.2 to 3.2 centimetres (0.87 to 1.26 in) long.

D. vascoana "is easily recognizable anatomically by the shape and colouration of its penis",[2] a main diagnostic character.

The "relatively small" and "bulbous" penis is purple-brown in color at the apex, and the branching penial appendage is white.

[2] When disturbed, the slug produces a copious white mucus.