Dinosaurs NameNoveltyStatusAuthorsAgeType localityLocationNotesImages Mandschurosaurus laosensis Sp. nov. Nomen dubium Hoffet Aptian-Albian Grès supérieurs Formation A species of Mandschurosaurus PachycephalosaurusBrown, B. and E.M. Schlaikjer. 1943. A study of the troodont dinosaurs with the description of a new genus and four new species. Bull. Am. Museum. Nat. Hist. 82: pp. 121-149. Gen. et sp. nov. Valid Brown & Schlaikjer Maastrichtian Lance Formation A new genus which at the time had the type species P. grangeri and includes the new combination for Troodon wyomingensis, P. grangeri is a synonym of P. wyomingensis which is a conserved name Troodon sternbergi Sp. nov. Valid Brown & Schlaikjer Campanian Dinosaur Park Formation A species of Troodon now Hanssuesia sternbergi Troodon edmontonensis Sp. nov. Valid Brown & Schlaikjer Maastrichtian Horseshoe Canyon Formation A species of Troodon now Sphaerotholus edmontonense
Plesiosaurs New taxa
Name Status Authors LocationImages Alzadasaurus syn of Thalassomedon Welles () Aphrosaurus Valid Welles () Fresnosaurus Valid Welles () Hydralmosaurus Synonym of Styxosaurus. Welles Hydrotherosaurus Valid Welles () Morenosaurus Valid Welles () Thalassomedon Valid Welles ( and ) Thalassonomosaurus Synonym of Styxosaurus. Welles
Synapsids Non-mammalian
Name Status Authors Age Location Notes ImagesDinodontosaurusValidRomer237 millions of years ago The Dicinodont with terrible teeth.ExaeretodonValidCabrera226 millions of years ago
This was a plant-eating Cynodont.TheropsisValid
References