who discovered them?
John Bell Hatcher and William H. Utterback
Thescelosaurus
The type specimen of "Thescelosaurus" (USNM 7757) was discovered in 1891 by paleontologists John Bell Hatcher and William H. Utterback
how many years ago was the thescelosaurus in existence? More than 66 million years ago which period was that? Late Cretaceous period describe this creature's physical characteristics. Its size has been estimated in the 2.5–4.0 m range for length, a weight of 200–300 kilograms and it may have been sexually dimorphic, with one sex larger than the other in which region were their fossils discovered? Niobrara County, Wyoming, USA
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Thescelosaurus [SEP] Discovery, history, and species
garbanii". Finally, they noted that another specimen, RSM P.1225.1, differed from "T. neglectus" in some anatomical details, and may represent a new species. Thus, "Thescelosaurus" per Boyd et al. (2009) is represented by at least two, and possibly three valid species: type species "T. neglectus", "T. garbanii", and a possible unnamed species. In December 2011, RSM P.1225.1 was assigned to its own species, "Thescelosaurus assiniboiensis". It was named by Caleb M. Brown, Clint A. Boyd and Anthony P. Russell and is known only from its holotype, a small, articulated and almost complete skeleton from the Frenchman Formation (late Maastrichtian stage) of Saskatchewan.