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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

The Hell Creek/Lance Formations have been very slow giving up their dinosaur secrets. Very few articulated skeletons have been found other than the king T rex. A couple of recent finds may increase the number of Caenagnathids in these fauna's. Caenagnathids are part of a group of bird like dinosaurs that are known by their easily identifiable hand claws. Currently only Anzu wyliei is described and accepted from these formations and is known from two partially articulated specimens and is the largest Caenagnathid in the fossil record. In 2013 a new species was was described from the Aguja Formation of Texas: Leptorhynchos gaddisi. Bones recovered from the Hell Creek of eastern Montana have similarities to this species and have been described as Leptorhynchos elegans but there still some uncertainty over that find. The current North American view of Caenagnathids is shown in this paper http://www.sciencedirect.com/science/article/pii/S0195667114001700 In August of 2016 a presentation was made at CSVP by David Evans et al. on a new large bodied Caenagnathid that was similiar to Anzu wyliei. The finds were fragmentary but could not be assigned to A. wyliei with expectations it was a new species . Artist (Paleop) rendition of these dinosaurs. Impact on collectors.... Hand and foot claws are typically what you see sold as Anzu wyliei. The hand claws I have in my collection are not all identical and now could be explained by these different species. In fact I have a jumbo toe bone that just did not fit A. wyliei but may be perfect for this larger foot specimen. Also specimens sold as juvenile A. wyliei may just be something else. No hand or foot claws claws have been discovered in the Hell Creek with these new finds so it's uncertain if they have a different morphology. Bottom line to collectors and a common thread is that identification of isolated bones to a species level is very difficult and problematic. We are still in the discovery phase in the Hell Creek/Lance Formations and have lots to learn. One prominent paleontologist suggested around 5 Caenagnathids in these fauna's. Purchase and collect specimens because they are cool, unique and special but don't get hung up in the name. The hand claws are very cool. From my collection and collected in 2014