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A new article is now available online:

 

Michelle R. Stocker; Sterling J. Nesbitt; Katharine E. Criswell; William G. Parker; Lawrence M. Witmer; Timothy B. Rowe; Ryan Ridgely; Matthew A. Brown (2016). "A Dome-Headed Stem Archosaur Exemplifies Convergence among Dinosaurs and Their Distant Relatives". Current Biology. in press. doi:10.1016/j.cub.2016.07.066.

 

Triopticus is just another one of the many additions of the list of Triassic reptiles that are superficially similar to dinosaurs but fall outside Dinosauromorpha. This discovery brings to mind the putative Triassic pachycephalosaur from India (mentioned in Naish and Martill 2001 and Butler and Sullivan 2009), and it's almost certain that the "Triassic pachycephalosaur" could be a relative of Triopticus, since the putative pachycephalosaur classification of the Indian form, like the ornithomimosaur classification of Shuvosaurus and avialan classification of Protoavis, was greeted with skepticism by Chatterjee's critics.

 

R. J. Butler and R. M. Sullivan, 2009. The phylogenetic position of Stenopelix valdensis from the Lower Cretaceous of Germany and the early fossil record of Pachycephalosauria. Acta Palaeontologica Polonica 54(1): 21-34

 

Naish, D. and Martill, D.M. 2001. Boneheads and horned dinosaurs. In: D.M. Martill and D. Naish (eds.), Dinosaurs of the Isle of Wight, 133–146. The Palaeontological Association, London.

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Interesting that this fossil was collected near Big Spring, Texas back in the 1940s and has been sitting in a storage area until somebody decided to do something with it!  Do you happen to have a link to a pdf of this paper?

 

-Joe

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