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A NEW GENUS AND SPECIES OF CAUDIPTERID DINOSAUR FROM THE LOWER CRETACEOUS JIUFOTANG FORMATION OF WESTERN LIAONING, CHINA
A new oviraptorosaur, Similicaudipteryx yixianensis gen. et sp. nov. is described from the Jiufotang Formation (120 Ma) of the Jehol Group in western Liaoning, China, which is referred to the Caudipteridae based on a dagger-like pygostyle and the shape of the ilium that are most similar to those of Caudipteryx. It differs from other oviraptorosaurids in that the ratio of pubis to ilium length is 1. 46 and the presence of two large and deep hypapophyses on dorsal vertebrae. The known caudipterids have previously been found only from the Jianshangou Member of the Yixian Formation (125 Ma) of the Sihetun area in Liaoning Province. S. yixianensis represents the first caudipterid dinosaur from the Jiufotang Formation. The new discovery provides more information for the discussion of the evolution of oviraptorids during the Early Cretaceous and adds to the dinosaur assemblage of the Jehol Biota.
Holotype of Similicaudipteryx yixianemis gen. el sp. nov. ( IVPP V 12556) Abbreviations: Cav. caudal vertebra; Cr. cervical rib; Cv. cervical vertebra; Dv. dorsal vertebra; Fe (1). left femur; Fe ( r) . right femur; Fi ( 1). left fibula; Hs. haemal spine; Hu ( 1). left humerus; II ( I ) . left ilium; II ( r ) . right ilium; Mt 1-IV. metatarsals I-IV; Pd I-IV. pedal digits I-IV; Py. pygostyle; Ps. pubic symphysis; Pu. pubis; Sc ( 1). left scapula; St. sternum; Sv. sacral vertebra; Ti ( 1). left tibia; Ti ( r) . right tibia