1) Cave crustacean 
Mesoniscus is a genus of woodlice, placed in its own family, Mesoniscidae, and section, Microcheta. It contains two species – Mesoniscus alpicolus and Mesoniscus graniger – that live in Central and Eastern Europe, mostly in and around caves. Mesoniscus is restricted to Central Europe and the Balkan Peninsula; the ranges of its two species do n...