Segnosauria, a new infraorder of carnivorous dinosaurs

A new infraorder of theropod dinosaurs, Segnosauria, is established which includes a single family Segnosauridae Perle, 1979. Representatives of this infraorder display a highly distinctive, opisthopubic pelvis, a slender mandible and anteriorly edentulous lower and upper jaw. A new, alti-iliac type of saurischian pelvis is distinguished, which is characteristic of Segnosauria. Erlikosaurus andrewsi Perle gen. et sp. n. is preliminarily described; a short description of Segnosaurus galbinensis Perle, 1979 and of a fragmentary pelvis determined on the infraordinal level are included.