Name: Hanssuesia ‭(‬named after Hans-Dieter Sues‭)‬.
Phonetic: Hanz-su-es-e-ah.
Named By: R.‭ ‬M.‭ ‬Sullivan‭ ‬-‭ ‬2003.
Synonyms: Stegoceras sternbergi,‭ ‬Troodon sternbergi.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Dinosauria,‭ ‬Ornithischia,‭ ‬Pachycephalosauridae.
Species: C.‭ ‬sternbergi‭ (‬type‭)‬.
Diet: Herbivore.
Size: Uncertain.
Known locations: Canada,‭ ‬Alberta‭ ‬-‭ ‬Dinosaur Park Formation,‭ ‬Oldman Formation.‭ ‬USA,‭ ‬Montana‭ ‬-‭ ‬Judith River Formation.
Time period: Campanian of the Cretaceous.
Fossil representation: ‭P‬artial remains of at least‭ ‬7‭ ‬individuals.

       Initially through to represent a piece of the dinosaur Troodon in‭ ‬1943,‭ ‬and later the genus Stegoceras,‭ ‬the single dome that makes up the holotype of this genus was named as Hanssuesia in‭ ‬2003.‭ ‬This came about as a result of the work of R.‭ ‬M.‭ ‬Sullivan in the Stegoceras genus when he noted that the dome was distinct enough to identify a new genus.‭ However a fresh study conducted in 2020 (Dyer & Powers), has considered Hanssuesia to be synonymous with Stegoceras.

Further reading
-‭ ‬Revision of the dinosaur Stegoceras Lambe‭ (‬Ornithischia,‭ ‬Pachycephalosauridae‭)‬.‭ ‬-‭ ‬Journal Of Vertebrate Paleontology‭ ‬23‭ (‬1‭)‬:‭ ‬181‭–‬207.‭ ‬-‭ ‬R.‭ ‬M.‭ ‬Sullivan‭ ‬-‭ ‬2003.
-‭ ‬Hanssuesia,‭ ‬the correct generic name for‭ '‬Hanssuessia‭' ‬Sullivan,‭ ‬2003.‭ - ‬Journal of Vertebrate Paleontology‭ ‬23‭(‬3‭)‬:714.‭ ‬-‭ ‬R.‭ ‬M.‭ ‬Sullivan‭ ‬-‭ ‬2003.
- The problematic pachycephalosaurid Gravitholus albertae: synchrotron imaging facilitates reappraisal of taxonomic validity. - Vertebrate Anatomy Morphology Paleontology. - Aaron D. Dyer & Mark J. Powers - 2020.


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