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Laevicaulis alte is a round, dark-coloured slug with no shell, 7 or 8 cm (2.8 or 3.1 in) long. Its skin is slightly tuberculated. The central keel is beige in colour.. This slug has a unique, very narrow foot; juvenile specimens have a foot 1 mm (0.039 in) wide and adult specimens have a foot that is only 4 or 5 mm (0.16 or 0.20 in) wide.
The word gastropod comes from Greek γαστήρ (gastḗr 'stomach') and πούς (poús 'foot'), a reference to the fact that the animal's "foot" is positioned below its guts. [ 7 ] The earlier name "univalve" means one valve (or shell), in contrast to bivalves , such as clams, which have two valves or shells.
Being mostly or entirely without shells, most slugs have reduced mantles.) Pilsbry (1948) stated that "the enormously developed mantle, the large empty shell sac, and the insertions of the free retractor muscles along the margins of the foot cavity, instead of dorsally as in the Arionidae are special to the Philomycidae". [2]
The black slug (also known as black arion, European black slug, or large black slug), Arion ater, is a large terrestrial gastropod mollusk in the family Arionidae, the round back slugs. Many land slugs lack external shells, having a vestigial shell. [ 2 ]
This slug is up to 5 centimeters long. It is pale brown, tan, [1] "buff or oatmeal-coloured", [2] with a darker head and tentacles. There are no obvious body markings. The sole of the foot is white. The mucus is clear, but when disturbed, the sole produces a white mucus. [1] This species lives in moist grassy and marshy habitat types.
Arion fasciatus is in many ways similar to most other stylommatophoran slugs. They are hermaphroditic.They have a head, mantle, and foot.There are two sets of retractable tentacles on their heads: the upper pair have light-sensing organs, and the lower two are used to smell.
A 30–40 mm. long (exceptionally up to 50 mm) roundback slug. In colour it is grey to bluish black, with dark lateral bands (the right band usually running entirely above the pneumostome). The tentacles are bluish or reddish, and the slug bluish or orange tip at the tail. The first row of tubercles above the foot-fringe is white.
A 50–70 mm roundback slug. It is brown in colour, ranging from black-brown through olive-brown to orange and bright reddish-orange. Darker lateral bands are present. Dark pigment reaches under the pneumostome from back to front. The foot fringe is pale with thin lines. The sole is uniformly pale/translucent.The tentacles are pale or dark.