The family Tillyardembiidae Zalessky, 1938 and the system of the plecopteroid insects

Abstract

The family Tillyardembiidae is limited to two genera (Tillyardembia G.Zalessky, 1937 and Kungurembia Aristov, 2004) and four species (T. antenaeplana G.Zalessky, 1937, T. Ravisedorum Vilesov et Novokshonov, 1993, K. brevicervix Aristov, 2004, and K. pallida Aristov, 2004), all from the Early Permian of Urals, Russia, and transferred from the order Grylloblattida to the previously strictly Carboniferous order Eoblattida close to the family Spanioderidae. Sister group relationship is inferred for Tillyardembiidae and stoneflies (order Perlida). Tshekardembia Novokshonov, 1995 with the only species T. sharovi Novokshonov, 1995 is transferred from Tillyardembiidae to Ivapteridae, and Permedax Aristov, 2004 with the sole species P. effertus Aristov, 2004 based on a fossil nymph is returned from Tillyardembiidae back to Grylloblattida incertae sedis.