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Sullivan also rejected attempts by Sereno (1986), in his phylogenetic studies, [15] to re-define Pachycephalosauridae to include only "dome-skulled" species (including Stegoceras and Pachycephalosaurus), while leaving more "basal" species outside that family in Pachycephalosauria. Therefore, Sullivan's use of Pachycephalosauridae is equivalent ...
In 2006, Sullivan and Spencer G. Lucas considered it a juvenile S. validum, which would expand the range of the species considerably. [ 23 ] [ 24 ] In 2011 , Steven E. Jasinski and Sullivan considered the specimen an adult, and made it the holotype of the new species Stegoceras novomexicanum , with two other specimens (SMP VP-2555 and SMP VP ...
Sullivan described the new genus Colepiocephale to house the species Stegoceras lambei. He also erected the new genus Hanssuesia to house the species Troodon sternbergi. [3] Artist's restoration of Alaskacephale. 2005. A. O. Averianov, T. Martin, and A. A. Bakirov described the new genus and species Ferganocephale adenticulatum. [13]
The genus Hanssuesia was first named by Robert M. Sullivan in 2003. The generic name honours paleontologist Hans-Dieter Sues. [3] The spelling variant "Hanssuessia" appeared in the publication, but the same year Sullivan chose for Hanssuesia as the valid name. [4] Its type species is Troodon sternbergi, and the combinatio nova is Hanssuesia ...
Pachycephalosaurus is the most famous member of Pachycephalosauria, even if it is not the best-preserved member. The clade also includes Stenopelix, Wannanosaurus, Goyocephale, Stegoceras, Homalocephale, Tylocephale, Sphaerotholus, and Prenocephale.
The type species, C. lambei, was originally described by Sternberg (in 1945 as Stegoceras lambei [1]), and later renamed by Sullivan in 2003. C. lambei is a domed pachycephalosaur characterized principally by the lack of a lateral and posteriosquamosal shelf, a steeply down-turned parietal , and the presence of two incipient nodes tucked under ...
Alaskacephale was a member of the group Pachycephalosauria, a family of thick-skulled, herbivorous, bipedal dinosaurs that lived during the Cretaceous period in Asia and North America. [7] The last pachycephalosaurs went extinct during the Cretaceous-Paleogene extinction event , the last surviving genus being Pachycephalosaurus itself.
Robert Sullivan considered Foraminacephale, "Prenocephale" edmontonensis, and Sphaerotholus goodwini to form a clade with the Asian taxon P. prenes. He considered Tylocephale the sister taxon to the Prenocephale clade , while sinking Sphaerotholus buchholtzae as a subjective junior synonym of "P." edmontonensis .