Carpathian blue slug
blue slug
bielzia coerulans latin

Bielzia coerulans, commonly known as the Carpathian blue slug or simply the blue slug, is a species of very large land slug, a terrestrial pulmonate gastropod in the family Limacidae, the keelback slugs.

Bielzia coerulans was discovered and described under name Limax coerulans by Austrian-Hungarian malacologist Michael Bielz (1787-1866) in 1851.