They are commonly called grylloblattids, but are also sometimes called ice crawlers or icebugs. Their appearance evidently puzzled the scientists who discovered them, E.M. Walker and T.B. Kurata; the first species named was Grylloblatta campodeiformis, which means "cricket-cockroach shaped like a Campodea" (a kind of two-pronged bristletail). Most are nocturnal and appear to feed on detritus. They have long antennae (23–45 segments) and long cerci (5–8 segments), but no wings. Their eyes are either missing or reduced and they have no ocelli (simple eyes).[3] Their closest living relatives are the recently discovered Mantophasmatodea.[4]