The newly-discovered species of cave-dwelling snail. Named Zospeum tholussum, the fragile and tiny snail has a translucent body and a beautiful dome-like shell that’s also almost completely transparent.
Dr. Alexander Weigand of Goethe-University Frankfurt, Germany discovered the snail in the Lukina Jama–Trojama cave system, the deepest cave system in Croatia.
All known species from the cave-dwelling genus Zospeum possess a limited ability to move. Their preference of a muddy habitat and the fact that they are usually located near the drainage system of the cave, in a close proximity to running water, however suggest that these animals are not exactly immobile. Scientists hypothesize that dispersal is achieved through passive transportation via water or larger mammals.