Five genera described over the past two decades have been suggested to form a clade with Therizinosaurus. Before beginning with the comparative analysis, it would be beneficial to review what is perserved for each genus. Only indisputable material is examined for each taxon. Theizinosaurus The only indisputable material for this genus is mostly complete forelimb, including the scapulocoracoid and several manua unguals . Segnosaurus Three specimens of this genus are known.
Material includes a mandible, pelvis, hindlimb , scapulocoracoid , and partial forelimb.
The type consists of a a presacral vertebral column and a nearly complete pelvis. Erlikosaurus Portions indisputably belonging to this taxon include the skull, pes, left humerus, and some cervical vertebrae. Enigmosaurus This genus is known only from a partial pelvis lacking the dorsal portion of the ilium. At least three individuals are known. The skeleton is nearly complete, lacking the skull and most of the mandible, acromial portion of the scapula and coracoid , anterior rim of the ilium, pubis, proximal ischium, proximal pes, and distal tip of caudal verteral series.