Invalid subtaxa: Bradycneme Harrison and Walker 1975 [nomen dubium], Dromaeosaurus cristatus Cope 1876 [nomen dubium], Dromaeosaurus laevifrons Cope 1876 [nomen dubium], Dryptosaurus cristatus Cope 1876 [nomen dubium], Dryptosaurus laevifrons Cope 1876 [nomen dubium], Euronychodon Antunes and Sigogneau-Russell 1991 [nomen dubium], Heptasteornis Harrison and Walker 1975 [nomen dubium], Koparion Chure 1994 [nomen dubium], Laelaps cristatus Cope 1876 [nomen dubium], Laelaps laevifrons Cope 1876 [nomen dubium], Saurornithoididae Barsbold 1974, Troodon cristatus Cope 1876 [nomen dubium]
Full reference: C. W. Gilmore. 1924. On Troodon validus, an orthopodous dinosaur from the Belly River Cretaceous of Alberta, Canada. Department of Geology, University of Alberta Bulletin 1:1-43
Parent taxon: Eumaniraptora according to P. Godefroit et al. 2013
Sister taxa: Avialae, Dromaeosauria, Dromaeosauridae, Pedopenna
Subtaxa: Archaeornithoides, Borogovia, Byronosaurus, Geminiraptor, Jinfengopteryx, Linhevenator, Mei, Philovenator, Saurornithoides, Sinornithoides, Sinovenator, Sinusonasus, Talos, Tochisaurus, Troodon, Urbacodon, Xixiasaurus, Zanabazar
Ecology: ground dwelling carnivore-omnivore