Abstract: A partial skeleton is described from the Upper Cretaceous Iren Dabasu Formation of Nei Mongol that represents a new therizinosauroid theropod, Erliansaurus bellamanus gen. et sp. nov. Distinctive characteristics of the new species include enlarged nutritional foramen on anterior caudals, prominent crest-like posterior trochanter on the humerus bordered medially by an oval depression, rugose swelling located dorsal to the ischiadic peduncle on the lateral surface of the ilium, posterior margin significantly higher than anterior margin on the fibular proximal end, and distally located hypertrophied anterior trochanter on the fibula. Preliminary analysis suggests that E. bellamanus represents an intermediate taxon between the primitive therizinosauroids and the advanced Therizinosauroidae. The discovery of E. bellamanus provides important information regarding the diversity within Therizinosauroidea.

摘要： 镰刀龙类化石主要分布于亚洲白垩纪地层(Russell and Dong ,1993 ;Xu et al. ,1999a ;Kirkland and Wolfe , 2001) 。最近发现于内蒙古上白垩统二连组的杨氏内蒙古龙(Neimongosaurus yangi) 代表这一类群中较为原始的属种(张晓虹等,2001) 。通过研究产自同一化石地点的镰刀龙类新材料,我们鉴定出一个不同于杨氏内蒙古龙的新属种,美掌二连龙(Erliansaurus bellamanus gen. et sp. nov. ) 。