Dale Russell
In 1969 Dale Russell described a new specimen of "Stenonychosaurus", a troodontid closely related to "Saurornithoides". This specimen, CMN 12340, was from the Oldman Formation of Alberta, which lies directly above the Dinosaur Park Formation. This specimen was later named "Latenivenatrix" and comes from the MAZ-2 level of the formation. Because of the similarities between "Polyodontosaurus", "Stenonychosaurus", and more complete "Saurornithoides", Russell concluded that "Polyodontosaurus" was a junior synonym of "Stenonychosaurus", and that they both might be synonyms of the tooth-taxon "Troodon", although the material of "Troodon" is very incomplete.