 The group is defined to include "Parksosaurus" and "Thescelosaurus" and a cladistic analysis by C.M.Brown in 2013 concluded that the genera "Changchunsaurus", "Haya", "Jeholosaurus" and possibly "Koreanosaurus" are also thescelosaurines.All Thescelosaurines were originally included in the family Hypsilophodontidae, which is presently considered polyphyletic (unnatural).