Glyptonotus antarcticus is a benthic marine isopod crustacean in the suborder Valvifera. Saduria entomon is a benthic isopod crustacean of the family Chaetiliidae. Cirolana is a genus of isopod crustaceans. Asellota is a suborder of isopod crustaceans found in marine and freshwater environments. Asellus is a genus of isopod crustaceans in the family Asellidae. The Bopyridae are a family of isopod crustaceans in the suborder Cymothoida. The Gnathiidae are a family of isopod crustaceans. The Idoteidae are a family of isopod crustaceans. Simple hexamers are found in the spiny lobster "Panulirus interruptus" and the isopod "Bathynomus giganteus". Cymothoa exigua, or the tongue-eating louse, is a parasitic isopod of the family Cymothoidae. Another parasite is an undescribed isopod similar to "Aega webbii". Some isopod groups have evolved a parasitic lifestyle, particularly as external parasites of fish. More recently the fauna included brine shrimp and a species of isopod. It is the most extensively investigated terrestrial isopod species. Idotea granulosa is a species of marine isopod in the family Idoteidae.