My colleague Martin Mandák has sent me the photo of a land slug from Madagascar. Locality: Madagascar, November 2014.
Identification of the family was easy: slugs of the family Veronicellidae looks exactly like this. The common English name is the the leatherleaf slugs and this one really looks like a fallen leaf. But the identification of the species is usually uneasy for all of its members. I have only the photo and therefore the dissection and molecular identification methods are unavailable.
Few possibilities what it could be:
Laevicaulis alte. This species is known from Madagascar, it is an agricultural pest and some photos on the internet looks similar to this coloration pattern.
Semperula maculata. This species is also known from Madagascar, it is an agricultural pest and one photo on the internet looks similar to this coloration pattern.
Or it can be anything else.
Gerlach J. (1998) “The shell-less slugs of Seychelles (Veronicellidae and Urocyclidae)“. Argonauta 11(2): 56-64.
“Laevicaulis alte (Férussac, 1821).” Discover Life, accessed 14 January 2015.