A crustacean order within the class Malacostraca, superorder Peracarida. Few spelaeogriphacean species are known, four extant species and two supposed fossil species. Spelaeogriphus lepidops is from a stream in a cave in Table Mountain, South Africa. Potiicoara brasiliensis inhabits a pool in a cave in the Mato Grosso, Brazil. Mangkurtu mityula (see illustration) and M. kutjarra have been reported from aquifers in the Pilbara region of Western Australia. Acadiocaris novascotica is a fossil from Carboniferous marine sediments in Canada, and Liaoningogriphus quadripartitus is a fossil from lacustrine (lake-associated) deposits of Jurassic age in China. It is probable that Acadiocaris is truly a spelaeogriphacean, but it is less certain that Liaoningogriphus is; on the basis of characters visible in fossils, its classification in this order or any other is impossible to justify.