What you are about to see is a scaled set of humeri in lateral view of a restricted clade, Therizinosauroidea. Much has been made of this group, but the variation that persists on a species by species basis has never been fully realized. It is, for example, possible to discriminate these taxa based solely on their humeri.
Caption to the above:
A, Alxasaurus elesitaiensis, IVPP V9612;
B, Nothronychus mckinleyi, MSM P-2117;
C, a therizinosaur from Iren Dabasu, AMNH 6368, formerly referred to Alectrosaurus;
D, Erlikosaurus andrewsi, GI 100/111;
E, Therizinosaurus cheloniformis, GI 100/15;
F, Neimongosaurus yangi, LH V0001; G, Chilantaisaurus tashuikousensis, IVPP V2884.1;
H, Beipiaosaurus inexpectatus, IVPP V11559.
Update: It should be noted that Chilantaisaurus tahsuikouensis, as included above, is not a therizinosauroid but rather an allosauroid, and certainly not a coelurosaur like therizinosauroids are. It is included to compare to a large, unusual humerus from central Asia. This is also missing three other therizinosaur taxa which have known humeral material: Erliansaurus bellamanus, Falcarius utahensis, and Nothronychus graffami. Other therizinosauroids are not known from humeral material, and are not included, such as Segnosaurus galbinensis and Enigmosaurus mongoliensis [which may be Erlikosaurus andrewsi]. Thanks to Andrea Cau in comments for catching this lapse.