The distribution of Deroceras laeve was originally Palearctic, from the subpolar zones to the southern margins.

[4] Reproductive system:[4] Penis is often reduced, elongated if present, without proper penial gland but with two or more tiny glandular papillae and its end.

Retractor is unforked and attached at half penis length, stimulator small, cone-shaped but looks more like a papilla.

[4] Deroceras laeve has high ecological tolerance, but needs permanently wet habitats.

[4] Deroceras laeve is omnivorous and capable of eating eggs and small insects, but tends to prefer plant matter, either alive or dead.

[4] Parasites of Deroceras laeve include: This article incorporates public domain text from the reference [4]