Caenagnathids of the Dinosaur Park Formation

[Troodon]

From abstract:

Some authors recognize three Caenagnathid genera, others suggest only two were present, and there is considerable disagreement about which specimens are referable to which genus.  This study aims to resolve this issue by reviewing the known specimens and using osteohistology, to establish a testable taxonomic framework of Dinosaur Park

 

https://journals.library.ualberta.ca/vamp/index.php/VAMP/article/view/29362

 

 

[DD1991]

Funston and Currie (2020) solve the question of whether or not Chirostenotes and Caenagnathus are synonymous by demonstrating that the mandible of a partial skeleton (UALVP 59400) they refer to Chirostenotes pergracilis is morphologically distinct from Caenagnathus collinsi. Renaming "Ornithomimus" elegans as Citipes is a different matter, though, as that taxon was previously referred to Elmisaurus or Leptorhynchos. Nonetheless, Greg Funston has now provided evidence from newly discovered specimens that more than one caenagnathid taxon existed in the Dinosaur Park Formation. 

 

Funston, G.F., and P.J. Currie. 2020. New material of Chirostenotes pergracilis (Theropoda, Oviraptorosauria) from the Campanian Dinosaur Park Formation of Alberta, Canada. Historical Biology DOI: 10.1080/08912963.2020.1726908:1–15.

[dinosaur man]

Wow!  Amazing!