[D] Wuerhosaurus ordosensis
Ornithischia Thyreophora Stegosauria Stegosauridae Wuerhosaurinae
Wuerhosaurus homheni (Dong, 1973) > Wuerhosaurus ordosensis (Dong, 1994)
Shortened stegosaur backs, which seems to have culminated with Wuerhosaurus ordosensis, an Early Cretaceous Chinese stegosaur that had just 11-12 dorsal vertebrae.
It also seems to have had the shortest forelimbs relative to hindlimbs of any stegosaur. (Dong, 1994)