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Hello, I am interested in this. A Ilium bone from south Dakota. 23 x 10 x 5 cm. Is anyone able to tell that it is a Pachycephalosaur or is it a different dinosaur? thanks

Hello, Is it possible to identify isolated pachycephalosaurus teeth? My tooth has some moderate to heavy feeding wear on it so I don't know if its possible. I have the dinosaur systematics book however this doesen't help that much with identifying teeth. It only talks about cranial material.

Hi all, Saw this tooth and Im not really sure how to distinguish pachy and thesc premax teeth well. Looked at @Troodon’s thread though from what I can see, I think Im leaning towards my tooth as a pachy just based on morphology similarities. Tooth is from Powder River County, Montana and is 5/16th of an inch. Thanks!

For day 3, it was decided to go back to the Deers Ears butte. Everyone was sore and worn out from 2 days of hiking, so a chance to stay in a single spot and dig would be a chance to rest. My team went to the Tooth Draw quarry, the others went to other sites, including one new one. The day started pretty slow, but then mid afternoon my son uncovered a tooth (havent determined T.Rex or Nano). I was so proud of him, he did an expert job in recovery. The tip was broken insitu and could have been easily separated or lost, but he was slow, careful and judicious with the paleobond and got the tooth out whole. Now I need to find my photo scale to count serrations. This tooth has a lot of wear but there should be enough left to make a good count. Within half an hour, 2 more Rex teeth were uncovered by other diggers. Another storm was building and there was worry we would have to jump and run again, so those with finds were trying to get them out quickly. I began packing up my gear but the storm blew past us to the south, so we went back to digging. That was when my son found a Pachycephalosaur hornlet! It was kind of funny because at first it looked like just another BOB, but as my son scraped away some more matrix from it he said "Its got a weird wrinkled texture." When I looked at it close I yelled " I know what that is!!" For those unfamiliar, Pachy material is VERY limited, so this piece is going to be made available for research and study. As rare as this little find was, it would be dwarfed by a find from another group that day. Someone found a Pachy skull dome at one of the new sites! I was hoping Walter would be so excited that he would prep it out that night, but he had other things that needed attention, so we only got to see the dome. Any attached hornlets were still in the matrix block. Hoping that he posts some prepped pics soon! So 2 more good finds from my son, but I struck out this day.

Pachycephalosaurid/Thescelosaurus Pes Claw Identification - Troodon have you discussed this topic?

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.

Hello! I am placing my recently acquired Pachycephalosaur Foot claw for trade, it was found in hell creek, its an inch long. I may not trade it, but I felt compelled to see what would be offered. I'm mostly interested in: -Marine material (Plesiosaur, Ichthyosaur, ETC) -Theropod Teeth -Other Claws Will be willing to look at other offers too! I am in the UK, so mostly looking for other UK traders, but US ones welcome! Thank you!

The recent description of Acrotholus has provided me with a new insight into the early evolution of pachycephalosaurs in North America, as this is the oldest genus of domed pachie from the continent and an undescribed pachycephalosaur from the Wahweap Formation of southern Utah is also fully domed. Given that the oldest pachie, Amtocephale, is not flat-headed, does the discovery of Amtocephale and Acrotholus prove that the oldest pachies were domed and not flat-headed?