. "Arion fuscus, aka \"Dusky Arion\", is a species of small air-breathing land slug, a terrestrial pulmonate gastropod mollusk in the family Arionidae, the roundback slugs.Arion subfuscus (Draparnaud, 1805) is considered by some authors to be a partial synonym for Arion fuscus.Arion subfuscus (Draparnaud, 1805) and A. fuscus (M\u00FCller, 1774) have very similar morphology and have overlapping distributional ranges in northwestern Europe."@en . . . . . . . "NE" . . "Arion fuscus"@en . "Arion subfuscus (Draparnaud, 1805)" . .