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Nembrotha kubaryana, also known as the variable neon slug or the dusky nembrotha, is a species of colorful sea slug, a dorid nudibranch, a marine gastropod mollusk in the family Polyceridae. [ 3 ] Synonymy
Arion occultus is a species of small air-breathing land slug, a terrestrial pulmonate gastropod mollusk in the family Arionidae, the roundback slugs. Distribution [ edit ]
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.Several vernacular names exist, but it is unclear if they are much in use: brown soil slug, common garden slug, darkface arion, Mabille's orange-soled slug, April slug.
Sea slugs have an enormous variation in body shape, color, and size. Most are partially translucent. The often bright colors of reef-dwelling species imply that these animals are under constant threat of predators. Still, the color can warn other animals of the sea slug's toxic stinging cells (nematocysts) or offensive taste.
With slugs, it is often difficult to establish good criteria for identifying species using external features or internal features, as colouration can be quite variable, and the rather plastic anatomy makes diagnostic anatomical features difficult to establish. See the article on Arion distinctus for characters distinguishing that from this species.
The animal is slender, with a body approximately hexagonal in cross-section due to four prominent longitudinal keels (dorsal grooves) — two on each side. The upper keels are separated by about three-fifths of the body’s width and run nearly parallel, diverging slightly just in front of the respiratory opening before converging posteriorly into a short median keel (3–4 mm in length).
Arion circumscriptus, common name brown-banded arion, is a species of air-breathing land slug, a terrestrial pulmonate gastropod mollusk in the family Arionidae.It is commonest in woodland, occurring across most of Europe, except for more southern regions, and is also widespread in North America.
Arion fuscus, also known as the "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 .