Thaumatogryllus conanti is a nocturnal species of cricket endemic to the island of Nihoa, where it is found in Devil's Slide, a narrow ravine. It is named after Dr. Sheila Conant, the scientist who discovered it in the 1980s. Including T. conanti, there are only four known species in the genus Thaumatogryllus, which is endemic to Hawaii. Another species is found only in lava tubes on the Island of Hawaii.