New Primitive Hadrosaur From Texas

[Scylla]

Fossil found in 1980's helps point to Hadrosaur origins in American Southwest.

 

https://m.phys.org/news/2019-07-strange-species-duck-billed-dinosaur.html

[Troodon]

Glad to see this paper.  This specimen was originally called Kritosaurus sp and led sellers to call all hadrosaur material coming out of the Aguja Fm with that ID.   Multiple Hadrosaurids exist in this fauna.

[Scylla]

Newly described hadrosaur may have used its teeth to scoop or saw.

 

https://blogs.scientificamerican.com/laelaps/paleontologists-unveil-shovel-billed-dinosaur/

[DD1991]

Aquilarhinus is another new addition to the roster of hadrosaurids from the late Santonian-early Campanian of Laramidia, which includes Gryposaurus latidens and Acristavus (remember that the Aguja Formation spans several million years, like the Two Medicine Formation). Note in the cladogram for Aquilarhinus that the Big Bend kritosaurin is a different taxon than Aquilarhinus and comes from the upper part of the Aguja Formation. Since Hadrosaurus has been recovered at the base of Hadrosauridae, it is probable that some basal hadrosaurids entered Appalachia from Laramidia about 90 million years ago.