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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.
Catherine Forster and others found that troodontids were the sister group of the avialans. [2] 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 ...
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).
The oldest Archaeopteryx (Avialae) was found in the Solnhofen Limestone in Germany, [26] while the oldest evidence of Dromaeosauridae was unearthed in the Morrison Formation in North America. [27] Troodontidae continued to diversify and can be found in Asia, Europe and North America.
The Late Jurassic of North America, however, is the exact opposite of the Middle Jurassic. The Late Jurassic Morrison Formation is found in several U.S. states, including Colorado, Utah, Wyoming, Montana, New Mexico, Oklahoma, South Dakota, and Texas. It is notable as being the most fertile single source of dinosaur fossils in the world.
Dinosaur remains are among the fossils that have been recovered from the formation, most notably Pentaceratops sternbergii,. [1] Other fossils found in the formation are the ammonite Lewyites , tyrannosaurids , dromaeosaurids , troodontids , nodosaurids , ankylosaurids , hadrosaurids , hybodonts , neosuchian crocodylomorphs , and the mammals ...
The only known specimen of Talos was recovered at the Kaiparowits Formation, in southern Utah.Argon-argon radiometric dating indicates that the Kaiparowits Formation was deposited between 76.1 and 74.0 million years ago, during the Campanian stage of the Late Cretaceous period.
Latenivenatrix, meaning "hiding huntress", is a genus of large troodontid known from a single species, L. mcmasterae.Along with the contemporary Stenonychosaurus, it is known from non-tooth fossils that were formerly assigned to the now potentially dubious genus Troodon.