Dong Zhiming
Shortened forelimbs in relation to hind legs was a common trait among theropods, most notably in the abelisaurids (such as "Carnotaurus") and the tyrannosaurids (such as "Tyrannosaurus"). This trait was, however, not universal: spinosaurids had well developed forelimbs, as did many coelurosaurs. The relatively robust forelimbs of one genus, "Xuanhanosaurus", led Dong Zhiming to suggest that the animal might have been quadrupedal. However, this is no longer thought to be likely.