- Limax coerulans M. Bielz, 1851
- Limax schwabi Frauenfeld, 1864
- heynemanni E.A. Bielz, 1867
- transsylvanicus Hazay, 1883
- incompta M. von Kimakowicz, 1884
Carpathian blue slug, Blue slug
Value of species
Bielzia coerulans was discovered in 1847 and described under the name Limax coerulans by Austrian-Hungarian malacologist, Michael Bielz (1787-1866), in 1851. (His son Eduard Albert Bielz was also a malacologist.)
Bielzia coerulans is the only species in the genus Bielzia.
Some authors, for example Russian malacologists, classify genus Bielzia as the only genus (monotypic) within the separate family, Limacopsidae. There is also a separate subfamily, Bielziinae, for genus Bielzia (I. M. Likharev & Wiktor, 1980).
This species is endemic to the Carpathian Mountains in Eastern Europe.
This slug turns blue when an adult and becomes 100 – 140 mm in length. It is evenly blue or bluish green (occasionally black) with a dark greyish head and tentacles, and margins pale yellowish, sole pale yellowish or whitish.
Juveniles are yellowish brown with dark lateral bands.
Reproductive system: Genitalia are without penis. There is only an accessory organ for copulation.
Bielzia coerulans inhabits deciduous and coniferous forests in mountains, usually at the bottom, or under dead wood logs.
Maturity is in June to July. Copulation occurs at the soil. There are 30-80 eggs laid in one clutch. Adults die after egg deposition. Half grown juveniles hibernate. Fully grown slugs appear in May.
According to the taxonomy of Bouchet & Rocroi (2005), Limacopsidae and Bielziinae are synonyms for Limacinae.