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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 ...
Troodon bakkeri (Carpenter, 1982) Pectinodon is a genus of troodontid theropod dinosaurs from the end of the Maastrichtian age of the Late Cretaceous period (66 mya ). It currently contains a single valid species , Pectinodon bakkeri (sometimes classified as Troodon bakkeri ), known only from teeth.
Sereno defined the Troodontidae as all taxa more closely related to Troodon formosus than to Velociraptor mongoliensis. [14] 1999. Fernando Emilio Novas and others reported a possible troodontid specimen from Coniacian to Turonian-aged sediments in South America. If this report is accurate it suggests that after first evolving in Asia ...
Restoration. Talos is a troodontid, a group of small, bird-like, gracile maniraptorans.All troodontids have many unique features of the skull, such as closely spaced teeth in the lower jaw, and large numbers of teeth.
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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]