Lehmannia nyctelia (Bourguignat, 1861)
May huddle together in shelter (Herbert 1997). Appear in abundance after rain (Wiktor 1983).
Lehmannia valentiana.
External: Gray to pink-brown, fairly translucent skin; lyre-shaped banding on mantle; pair of longitudinal dark lines (sometimes breaking up into spots) on dorsum and mantle on either side of a mid-line (sometimes apparent); small keel; pale edge of pneumostome; clear mucus; pale sole (Quick 1960; Herbert 1997, 2010).
Internal: Pigmented ovotestis and hermaphrodite duct; penis long, coiled, of consistent width, and 2/3 body length (Wiktor 1983); penis without flagellum/penial gland, and with internal fold and "comb" at end; short, thick free oviduct; spermatheca ovate, sometimes pigmented, with wide duct; long rectal caecum (Quick 1960).
Externally similar to L. valentiana, distinguished through internal anatomy (penis lacks appendage at tip) (Kerney & Cameron 1979). Internal anatomy like L. maculatus and Malacolimax tenellus, but longer penis - curved penis, spermatheca duct connecting to its base (Kerney & Cameron 1979).
To 40-60 mm long extended (Herbert 1997, 2010); preserved: to 46 mm long, 9 mm wide, mantle 16 mm long (Wiktor 1996).
Native to: N Africa, Central and SE Europe (Balkans and mountains of E European) (Kerney & Cameron 1979; Wiktor 1983)
Non-native in: US, S Africa, UK, Egypt (Wiktor 1983); Australia, New Zealand, South Africa (Herbert 1997).
Deciduous forests, particularly beech; mountains to and above timberline; to 2700 m in Bulgaria (Wiktor 1983); gardens; under fallen logs, stones, in compost heaps in shady places (Herbert 1997).