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Nesov described the new species Troodon asiamericanus. [6] Troodon eggs continued to attract scholarly attention in the 1990s. 1996. Darla Zelenitsky and Leonard Hills described the eggs of Troodon formosus. They found that the surface of Troodon eggs were smooth and their pores occurred singly or in pairs. When viewed in thin section, the ...
Troodon (/ ˈ t r oʊ. ə d ɒ n / TROH-ə-don; Troödon in older sources) is a former wastebasket taxon and a potentially dubious genus of relatively small, bird-like theropod dinosaurs definitively known from the Campanian age of the Late Cretaceous period (about 77 mya). It includes at least one species, Troodon formosus, known from Montana.
Troodontidae / t r oʊ. ə ˈ d ɒ n t ɪ d iː / is a clade of bird-like theropod dinosaurs from the Late Jurassic to Late Cretaceous.During most of the 20th century, troodontid fossils were few and incomplete and they have therefore been allied, at various times, with many dinosaurian lineages.
Because the holotype of T. formosus is a single tooth, this may render Troodon a nomen dubium. [ 5 ] In 2017, Evans and colleagues, building on the work of Zanno and others, confirmed the currently undiagnostic nature of the holotype of Troodon formosus and suggested that Stenonychosaurus be used for troodontid skeletal material from the ...
While historically considered synonymous with Troodon or more specifically the species Troodon formosus, Philip Currie and colleagues (1990) noted that the P. bakkeri fossils from the Hell Creek Formation and Lance Formation might belong to different species. In 1991, George Olshevsky assigned the Lance formation fossils to the species Troodon ...
A troodontid that has been historically considered synonymous with Troodon, now a valid genus. †Pyroraptor †Pyroraptor olympius; 70.6 Ma France A dromaeosaur known only from a few bones: the distinctive foot claws, as well as fossilized teeth, arm and vertebrae. †Rahonavis †Rahonavis ostromi; 70 Ma
Other types of eggs from Two Medicine include Montanoolithus, [25] Prismatoolithus levis (the eggs of Troodon formosus), some small unidentified theropod eggs, [26] P. hirschi, Triprismatoolithus, Tubercuoolithus, Spheroolithus albertensis (eggs of Maiasaura), S. choteauensis, eggs of Hypacrosaurus, and Krokolithes. [21]
The prosauropod Massospondylus carinatus 15 years of age, [6] the sauropods Lapparentosaurus and Narindasaurus 43 years, [7] the coelophysoid Megapnosaurus rhodesiensis 7 years, [6] and the maniraptor Troodon formosus 3-5 years of age respectively. [8]