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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.
Apart from Troodontidae, Dromaeosauridae and Avialae began spreading to other continents. Dromaeosauridae dispersed to Asia and Africa, [7] likely made possible by the Apulian Route connecting Eurasia and Africa, [35] and the Bering Land Bridge linking North America and Asia. [18]
Dromaeosaurus is the type genus of both Dromaeosauridae and Dromaeosaurinae, which include many genera with similar characteristics to Dromaeosaurus such as possibly its closest relative Dakotaraptor. Dromaeosaurus was heavily built, more so than other dromaeosaurs that are similar in size, like Velociraptor.
Dromaeosauridae (/ ˌ d r ɒ m i. ə ˈ s ɔːr ɪ d iː /) is a family of feathered coelurosaurian theropod dinosaurs. They were generally small to medium-sized feathered carnivores that flourished in the Cretaceous Period .
Birds, members of the paraves, are the only living dinosaurs. Paraves are a widespread group of theropod dinosaurs that originated in the Middle Jurassic period. In addition to the extinct dromaeosaurids, troodontids, anchiornithids, and possibly the scansoriopterygids, the group also contains the avialans, which include diverse extinct taxa as well as the over 10,000 species of living birds.
Several features of the tooth are only known from members of the family Dromaeosauridae of theropod dinosaurs. [8] Dromaeosauroides was classified as a member of the Dromaeosaurinae subfamily within the Dromaeosauridae, due to its similarity to Dromaeosaurus. Despite the resemblance, Dromaeosauroides is not considered part of that genus.
Troodontidae (T. formosus > Velociraptor mongoliensis) Dromaeosauridae ( Microraptor zhaoianus + Sinornithosaurus millenii + V. mongoliensis ) Avialae ( Archaeopteryx + Neornithes)
Maniraptora is a clade of coelurosaurian dinosaurs which includes the birds and the non-avian dinosaurs that were more closely related to them than to Ornithomimus velox.It contains the major subgroups Avialae, Dromaeosauridae, Troodontidae, Oviraptorosauria, and Therizinosauria.