Arionidae, common name the "roundback slugs" or "round back slugs" are a taxonomic family of air-breathing land slugs, terrestrial pulmonate gastropod mollusks in the superfamily Arionoidea.

Arion is a genus of air-breathing land slugs in the family Arionidae, the roundback slugs. Most species of this Palearctic genus are native to the Iberian Peninsula. [2]

Mar 1, 2012 · Slugs are close relatives of snails—essentially snails without a shell. They are legless, soft-bodied creatures with four front tentacles, two that carry the eyes and two that operate like antennae. Slugs also have a covering of slimy mucus all over their bodies.

Superfamily Limacacea Marginal teeth of radula with narrow, lengthened basal plates, usually unicuspid; zonitid snails with smooth shells and many sluglike species, common in wet, tropical areas and in temperate regions; about 12 families, including limacid and milacid…

Arionidae is a family of snails. They have sexual reproduction. Capable of creating a new organism by combining the genetic material of two gametes, which may come from two parent organisms or from a single organism, in the case of self-fertilizing hermaphrodites. EOL has data for 22 attributes, including:

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Arion hortensis, A. distinctus, and A. owenii are a species complex that was originally recognized and divided by Davies (1977, 1979). A distinctus has blue-black to gray tentacles and head, rather than the reddish ones of A. hortensis, and the bands on its mantle are lower and convergent rather than divergent.

Arion distinctus is a species of air-breathing land slug in the family Arionidae, sometimes known as the roundback slugs. It is a terrestrial pulmonate gastropod mollusc.

Family Arionidae. Arionidae: pictures (17) Related Taxa. Species Ariolimax columbianus. Ariolimax columbianus: information (1) Ariolimax columbianus: pictures (7) Species Arion ater. Arion ater: information (1) Arion ater: pictures (4) Species Arion lusitanicus.

Montana Field Guide contains a wealth of information about Montana's diverse species.