16 May 2012
Species of a Sinraptor
Y. shangyouensis came from a skull and assorted skeletal bits, as most dinosaurs do unfortunately. Y. magnus was nearly the same, but much larger. Y. hepingensis is not even considered a species by some that belongs to Yangchuanosaurus, but is considered to be a second species of the genus Sinraptor; which for the moment only contains definitively Sinraptor dongi. There are conflicting arrangements of Y. hepingensis in many places. Gregory Paul considers it a distinctive species of Yangchuanosaurus in his newest publications with the other two species representing one species in different stages of growth while many others have taken to calling it Sinraptor hepingensis. It's rather astounding how much confusion there is. There may very well be an official answer, and it does look as though that answer ends in the Sinraptor genus, but if it does, no one told all of the websites and even some official sources. Paleontology just has too many squabbles over ideas and theories without ways to prove some of them definitively, and that is okay in the end.