Proteus anguinus

Olm, a reference photo
Photo: Yerpo · CC BY-SA 3.0 (licence)

Olms (German: [ɔlm] ) are the nine species in the genus Proteus. They are aquatic salamanders, and the only exclusively cave-dwelling chordate genus found in Europe. The genus is assigned to the family Proteidae, along with Necturus. In contrast to most amphibians, this genus is entirely aquatic; eating, sleeping, and breeding underwater. Living in caves found in the Dinaric Alps, the genus is endemic to the waters that flow underground through the extensive limestone bedrock of the karst of Central and Southeastern Europe in the basin of the Soča River (Italian: Isonzo) near Trieste, Italy, southern Slovenia, southwestern Croatia, and Bosnia and Herzegovina.

From Wikipedia, under CC BY-SA 4.0.

Is it venomous or poisonous?

We have no record of Olm being toxic, poisonous or venomous. That is not proof that it is safe. Never eat, touch or handle a wild plant, mushroom or animal on the strength of an identification; ask someone qualified.

Easily confused with

Classification

Kingdom
Animalia
Phylum
Chordata
Class
Amphibia
Order
Caudata
Family
Proteidae
Genus
Proteus
Species
Proteus anguinus

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