compromising four partial metatarsals, partially preserved digits I and III, and nearly complete digits II and IV. These newer remains were described by the also Mongolian paleontologist Altangerel Perle in 1982. He regarded the referral of Therizinosaurus and Therizinosauridae to Chelonia (turtles order) to be unlikely, and hypothesized Therizinosaurus and Segnosaurus—at the time of this description regarded as a theropod dinosaur—to be particularly similar based on their respective scapulocoracoid morphology, only differing in size. Perle referred MPC-D 100/45 to Therizinosaurus given that this specimen was found near the location of MPC-D 100/15 and was virtually similar to the described pes for Segnosaurus. In 1990, Barsbold and Teresa Maryanska agreed with Perle in that the hindlimb material from Hermiin Tsav he described in 1982 was therizinosaurian (then called segnosaurians) given that the metatarsus was stocky and the astragalus had a laterally arched ascending process (bony extension), but cast doubt with his referral of it to Therizinosaurus and the segnosaurian identity for this taxon since it was only known from the pectoral girdle and other forelimb elements, making direct comparisons between specimens impossible. They considered this specimen to represent a Late Cretaceous representative of the Segnosauria, but not Therizinosaurus. In 2010 however, the North American paleontologist Lindsay E. Zanno in her large taxonomic reevaluation of Therizinosauria considered the referral of MPC-D 100/45 to Therizinosaurus to be likely based on the rationale that it was collected in the same stratigraphic context (Nemegt Formation) as the holotype, and shared the robust and four-toed morphology of other therizinosaurids such as Segnosaurus. She also excluded the rib material from the holotype as it was re-identified by Rozhdestvensky to likely have come from a sauropod dinosaur, and not Therizinosaurus itself. Description For maniraptoran standards, Therizinosaurus obtained enormous sizes, estimated to have reached in length with estimated heights from and ponderous weights from to possibly over . These dimensions make Therizinosaurus the largest therizinosaur known and the largest known maniraptoran. Along with the contemporaneous ornithomimosaur Deinocheirus, it was the largest maniraptoriform. Though the body remains of Therizinosaurus are relatively incomplete, inferences can be made about its physical characteristics based on more complete and related therizinosaurids. Like other members of its family, Therizinosaurus had a proportionally small skull bearing a rhamphotheca (horny beak) atop its long neck; bipedal gaits; a large belly for foliage processing; and sparse feathering. Other traits that were likely present in Therizinosaurus include a heavily