found: The paleobiology database, via WWW, Oct. 30, 2006(family Rhytidosteidae, superfamily Rhytidosteoidea, order Temnospondyli, subclass Labyrinthodontia, class Amphibia)
found: Palaeos : the trace of life on Earth, via WWW, Oct. 30, 2006(Rhytidosteidae. Range: Late Permian to Early Triassic worldwide)
found: Index to organism names, via WWW, Oct. 30, 2006(Rhytidosteidae. Temnospondyli (Order), Labyrinthodontia (Subclass), Amphibia (Class))
found: Wikipedia, Oct. 30, 2006(Superfamily [sic] Rhytidosteidae, Infraorder Trematosauria, Suborder Stereospondyli, Order Temnospondyli)
