Hadopyrgus
Hadopyrgus is a genus of white or transparent freshwater snails found only in New Zealand. They are micromolluscs, just a few millimetres long, in the gastropod family Tateidae. "Hadopyrgus" species are subterranean – living in caves, underground aquifers, or deep in river gravels – and so were named from the Greek "hades" (underworld) and "pyrgos" (tower). They can have quite restricted ranges: "Hadopyrgus ngataana", for example, has been found in just one pool, in a stream flowing through a single cave. Species. Species within the genus "Hadopyrgus" include: