Agriolimacidae is the largest slug family, some are introduced all over the world, synanthropes are often severe pests.[1]
Anatomy
Most slugs in the family Agriolimacidae are rather small; only a few (in the generaMesolimax and Krynickillus) are larger. Most are not more than 50 mm long.[1] The mantle is usually large, occupying approximately 1/3 of the entire body length, situated in the anterior part of the body.[1] The pneumostome is clearly postmedial.[1] The surface of the mantle in living slugs is covered in concentric, mobile wrinkles.[1] In addition sometimes there is a shallow, poorly defined groove which runs above the pneumostome on the right side, not passing to the left.[1]
The penis is short, usually bag-shaped, often with external appendages, inside with different stimulatory organs.[1] No tubular membrane encircles the penis and vas deferens.[1] The penis retractor muscle is situated beside the right tentacle.[1]
In this family, the number of haploidchromosomes lies between 26 and 30 (according to the values in this table).[6]
^Barker G. M.: Gastropods on Land: Phylogeny, Diversity and Adaptive Morphology. in Barker G. M. (ed.): The biology of terrestrial molluscs. CABI Publishing, Oxon, UK, 2001, ISBN0-85199-318-4. 1–146, cited pages: 139 and 142.