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.
A new representative of the pachycephalosaur family Homalocephalidae Dong is described, which comes from the Upper Cretaceous deposits of the Gobi Desert, Mongolian People’s Republic. It is more primitive and probably stratigraphically older than Homalocephale calathocercos known from the Upper Cretaceous Nemegt Formation of the Gobi Desert. The diagnosis of H. calathocercos is revised.
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