Arion (Kobeltia) fagophilus de Winter, 1986
External: Small to medium slugs; gray dorsum and mantle, white sides, with darker stripes in between; red tentacles; bright orange sole and foot fringe (De Winter 1986).
Internal: Genital system is entirely cream-colored except for purple-brown ovotestis; epiphallus on apex of atrium, with small papillae on inner surface of epiphallus, and a thin wall at its junction with the atrium; free oviduct has a central muscular section probably used as a stimulator and a 2-fold ligula in a thin-walled lower section; spermatheca on atrium's bulbous section; spermatheca a small round sac; spermatheca duct very wide and not differentiated from atrium (De Winter 1986).
Foot fringe is orange, which other Arion Kobeltia species do not have (De Winter 1986).
Holotype 25 mm long, 5.5 mm wide, 9 mm long mantle (De Winter 1986).
Spain (Navarra, Guipuzcoa provinces) (De Winter 1986).
Beech forest, in leaf litter (De Winter 1986).