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Slug Commonly used name of a number of gastropods which in the course of evolution have undergone a reduction or total loss of the shell. Slugs are opposed gastropod with a well-developed shell. Form slug arose independently in several groups of aquatic and terrestrial gastropods therefore the collection of all kinds are not considered as a taxon as well as the environmental form. Sometimes slugs that have preserved a rudimentary shell called polusliznyami.

It is believed that the reduction and subsequent loss of the shell had environmental conditions and occurs for example the transition to living in dense thickets of aquatic plants or litter. According to another hypothesis the cause of the deficit became necessary to build a shell of calcium in areas where formed groups in which there was a form of a slug. An important consequence of underdevelopment or absence of the shell is unable to isolate itself from the environment during the attack of a predator or the occurrence of adverse conditions.

Most of the land belongs to the slugs pulmonata from the group stylommatophora among which are many kinds of advanced shell. It is necessary to distinguish between the slugs as the environmental group life form without the expressed gastropods shells and representatives of the family of slugs Limacidae strict biotaksonomicheskoy unit.

Terrestrial slugs body pretty much elongated but is capable of changing shape due to muscle contractions. Externally, the slugs have bilateral symmetry. Her broken only located to the right pulmonary unpaired hole. Cutaneous epithelium emits large amounts of mucus which prevents drying of sheets contributes to better slip on the surface as well as discourages predators.

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