Deroceras is a taxonomic genus of small to medium-sized air-breathing land slugs in the family Agriolimacidae.

[2] Coloration varies considerably within and between species but common patterns are pale cream, with or without darker flecks (never stripes), and a more uniform light gray or brown to black-brown.

Mucus is usually colourless but in some species includes a white deposit when the slug has been disturbed.

The mantle is large (up to half the body length), containing a shell plate internally.

[3] In 2000, in the most recent monograph on the genus, Wiktor[2] rejected earlier attempts (including his own) at a subgeneric (Agriolimax Mörch, 1865, Plathystimulus Wiktor, 1973) classification, because there appeared to be so many convergences and reversals.