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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.
The classification of Troodon as a pachycephalosaur was followed for many years, during which time the family Pachycephalosauridae was known as Troodontidae. In 1945, Charles Mortram Sternberg rejected the possibility that Troodon was a pachycephalosaur thanks to its stronger similarity to the teeth of other carnivorous dinosaurs.
Since these families were the same but the Troodontidae named first, it carries scientific legitimacy. [2] Many milestones of troodontid research occurred between the description of Troodon and the resolution of their confusion with pachycephalosaurs. The family itself was named by Charles Whitney Gilmore in 1924. [2]
In 1924, Charles Whitney Gilmore named the family Troodontidae after Troodon, but most of its members would be recognizable today as pachycephalosaurs. [2] Seven years later, Gilmore named the new species "Troodon" wyomingensis which would be formally reclassified as Pachycephalosaurus in 1943.
While Pectinodon is only known from teeth, its larger family Troodontidae is known from much more complete specimens. They were small, bird-like feathered bipedal maniraptorans with proportionally large eyes and brains. Like dromaeosaurids, they possessed a "sickle-claw" on the second toe of each foot. See the Troodontidae article for more ...
While originally included in Saurornithoides, within the family Saurornithoididae, [2] Zanabazar is now thought to be a derived member of Troodontidae. [1] Life restoration Comparison of troodontid teeth; C, D, F, and G are Zanabazar. The cladogram below shows the phylogenetic position of Zanabazar among other troodontids following a 2014 ...
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.
Liaoningvenator (meaning "Liaoning hunter") is a genus of troodontid theropod dinosaur from the Early Cretaceous of China.It contains a single species, L. curriei, named after paleontologist Phillip J. Currie in 2017 by Shen Cai-Zhi and colleagues from an articulated, nearly complete skeleton, one of the most complete troodontid specimens known.