''Tandonia lagostana'' is a

species A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...

keel The keel is the bottom-most longitudinal structural element of a watercraft, important for stability. On some sailboats, it may have a fluid dynamics, hydrodynamic and counterbalancing purpose as well. The keel laying, laying of the keel is often ...

slug Slug, or land slug, is a common name for any apparently shell-less Terrestrial mollusc, terrestrial gastropod mollusc. The word ''slug'' is also often used as part of the common name of any gastropod mollusc that has no shell, a very reduced ...

in the family

Milacidae Milacidae is a family (biology), family of air-breathing, keel (slug), keeled, land slugs. These are shell-less terrestrial molluscs, terrestrial gastropod mollusks in the superfamily Parmacelloidea. This family has no subfamilies (according to ...

. It is endemic to the island of

Lastovo Lastovo () is an archipelago municipality in Dubrovnik-Neretva County in Croatia. The municipality consists of 46 islands with a total population of 792 people, of which 94.7% are ethnic Croats, and a land area of approximately . ''Lastovo Munic ...

Croatia Croatia, officially the Republic of Croatia, is a country in Central Europe, Central and Southeast Europe, on the coast of the Adriatic Sea. It borders Slovenia to the northwest, Hungary to the northeast, Serbia to the east, Bosnia and Herze ...

where it as last collected in 1940. There is an additional record from the

Montenegro , image_flag = Flag of Montenegro.svg , image_coat = Coat of arms of Montenegro.svg , coa_size = 80 , national_motto = , national_anthem = () , image_map = Europe-Mont ...

coast that requires confirmation.

References

{{Taxonbar, from=Q14750485 Milacidae Gastropods of Europe Endemic fauna of Croatia Gastropods described in 1940