Distribution of Geomalacus malagensis include southern Spain and Gibraltar.

[2] This slug species is pale beige-greenish to beige-grey, sometimes also yellowish-orange, with blackish narrow lateral bands having clearly marked upper edges and blurry lower edges, running from posterior end to frontal section of mantle, above the pneumostome.

[2] The shape of the slug is elongate, dorso-ventrally flattened (oval in transversal cut).

[2] Mucus secreted onto the ground while crawling breaks into thin threads and coagulates into a unique spider-web like pattern, not seen in Arion species.

[2] Geomalacus malagensis is frequent on calcareous soil, in gardens, shrubland and open forests.