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[R] Terrestrial or aquatic molluscs with a foot acting as a propulsive organ, the animal gliding along on a trail of slime, and bearing at its front 2 pairs of "horns". The mouth contains a rasping tongue or radula, which enables the animal to graze the surface of plant tissues.
The mantle secretes a spiral-shaped shell, whose size can be reduced.
Terrestrial snails and slugs, having a highly reduced internal shell, are provided with a lung with an aperture (pneumostome) and often cause damage to cultivated plants.
Among pest slugs in Europe rank the field slug (Deroceras reticulatum) and the (Arion hortensis).

[R] Images

* Snake (INRA)
a: peristome; b: tentacule portant l'oeil; c: tentacule ant_rieur; d: bulbe buccal; e: sole p_dieuse (ou pied); f: bord du manteau: g: shell.
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