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I found this in some matrix from the Lance Formation in Wyoming and wondered if it is an ankylosaur tooth. The hash marks are 1mm. Thanks for any help.

(EDITED 5/24/22) to add an undescribed Nodosaurid to Hell Creek/Lance Fm. I see a lot of misunderstanding on what is being sold online at auctions and dealers sites. Some have it correct but most mix up the terminology. So here is Anky 101 aimed at Novice collectors and I will keep it simple. What you see sold in most markets are teeth from late Cretaceous North American locations mostly Montana, Wyoming and the Dakota's so I will focus on those areas. (Hell Creek, Lance, Two Medicine and Judith River Formations) Teeth from Canadian locations will have similar characteristics. There are two basic families of armored dinosaurs in these regions Ankylosauridae and Nodosauridae. Ankylosaurids are the brutes with big tail clubs. Nodosaurids have no clubs but are fierce looking with big spikes projecting from its sides. You don't want to meet up with either family. So when these teeth come up for sale most are very worn and it can get difficult to ID, so if possible avoid buying those. There is also a variation in the teeth with jaw position. Wear facets are also very common on these teeth. My photographs show complete teeth that have little wear so you can see what they typically should look like. Let me call them your generic teeth and are good representation of these families. There are multiple genus that you run into and the species is dependent on what formation you are in, see below with what is currently understood. Some have yet to be described to a species level due to lack of skeletal remains but teeth are plentiful. Differentiating teeth between the two families is quite easy. For Ankylosaurids crowns are small with long roots with two key characteristics, a bulbous base, see white arrow and a prominent central ridge on SOME species like Ankylosaurus in the Hell Creek others it covers the entire face of the crown. Other examples of North American Ankylosaurids Nodosaur Teeth: Are much larger, both taller and wider than Ankylosaurids, a shelf is visible below a pocket in the crown, no center ridge. Looks like a mit. Hell Creek Formation Two Medicine Fm Undescribed Nodosaur Judith River FM If you are interested in additional reading let me suggest Dinosaur Systematics by Ken Carpenter. Its also a good book describing theropod teeth. Our current understanding of species described: based on the revised analysis by Paul Penkalski, 2018. These views might not be share by some paleontologists but thats normal. Let me also say that with new discoveries and research some of this is subject to change. Hell Creek and Lance Formation Ankylosaurus magniventris (Ankylosaurid) Denversaurus schlessmani (Nodosaurid) Indeterminate Nodosaurid: I have seen enough evidence (partial skeleton) that there exits an undescribed Nodosaurid (cf Glyptodontopelta) Judith River Formation Zuul crurivastator (Ankylosaurid) Undescribed Nodosaur Two Medicine Formation Oohkotokia horneri (Ankylosaurid) Edmontonia rugosidens (Nodosaurid) Dinosaur Park Formation Euoplocephalus tutus (Ankylosaurid) Anodontosaurus lambei (Ankylosaurid) Platypelta coombsi (Ankylosaurid) Scolosaurus thronus (Ankylosaurid) Dyoplosaurus acutosquameus (Ankylosaurid) Edmontonia rugosidens (Nodosaurid) Panoplosaurus mirus (Nodosaurid) Horseshoe Canyon Formation Anodontosaurus lambei (Ankylosaurid) Edmontonia longiceps (Nodosaurid) Oldman Formation Scolosaurus cutleri ? (Ankylosaurid) Undescribed Nodosaurid Revised systematics of the armoured dinosaur Euoplocephalus and its allies Paul Penkalski https://www.researchgate.net/publication/323579149_Revised_systematics_of_the_armoured_dinosaur_Euoplocephalus_and_its_allies

Hello . Is this tooth a Ankylosaur or a Nodosaur tooth ??? Locality : Hill county , Judith river formation Thank in advance !

Another one looking to ID. Judging by some of this bone’s characteristics, me and some friends are leaning ankylosaur. It looks similar to a skull piece I saw posted online as well. What are your thoughts?

Hi ! . need a bit of help ID this tooth from hill county , Judith river formation I am not sure if its pachycephalosaur or ankylosaur tooth . Best regard Guns

Hi everyone, I wanted to get some opinions on this piece I found in Montana's Hell Creek formation this past summer. My initial thoughts were that it was a ceratopsid skull fragment. It was a fossil I was planning on selling, but before I do I wanted to rule out the possibility that it was a piece of ankylosaur osteoderm as I have significantly less material from that clade of dinosaurs. The dimensions are about 8 cm by 7 cm.

Soto-Acuña, Sergio; Vargas, Alexander O.; Kaluza, Jonatan; Leppe, Marcelo A.; Botelho, Joao F.; Palma-Liberona, José; Simon-Gutstein, Carolina; Fernández, Roy A.; Ortiz, Héctor; Milla, Verónica; Aravena, Bárbara, 2021. Bizarre tail weaponry in a transitional ankylosaur from subantarctic Chile. Nature: 1–5. doi:10.1038/s41586-021-04147-1. ISSN 1476-4687. Links: This bizarre armored dinosaur had a uniquely bladed tail weapon (nationalgeographic.com) This Dinosaur Found in Chile Had a Battle Ax for a Tail - The New York Times (nytimes.com) Stegouros is quite unusual for ankylosaurs in that it had a tail whose armor is reminiscent of war clubs used by the Aztecs and Hawaiians, in sharp contrast to ankylosaurids having tail clubs similar to maces used by medieval knights. Moreover, the authors of the Stegouros paper recover this taxon along with Antarctopelta and Kunbarrasaurus in a distinct ankylosaur clade basal to Nodosauridae and Ankylosauridae, which they named Ankylosauria.

Hi, does anyone have or know where I can view images of a ankyloaurus/nodosaur foot but especially the ungals? Having a hard time finding images for a comparison.

Here are a few pics of one piece out of 200 specimens ive found over the past 3 days . Please assist me in giving as accurate an identification as possible .

We starting switching up our displays for the different styles of Dinosaur programs we do. The formation displays are great but we wanted to try this style for the Dino report programs. I like how these are shaping up and they help the flow of the presentations. We can switch fossils between the different displays and this gives us some flexibility. The first one completed is the Ceratopsians. We have two different decent sized Trike frill pieces and various teeth from Hell Creek. The Leptoceratops tooth is from Lance Creek and we have two JRF teeth. From the Aguja, we have a frill piece. Lastly a toe bone and a small frill piece from Horseshoe Canyon. We use a 7” Hell Creek vert and a 3” vert from Horseshoe as touch fossils. The kids like seeing the various pieces of different Ceratopsians from different locations.

Hi everybody, i saw that Judith River bones for sale. This one is presented as a turtle bone Is it really an ankylosaur item ? If you need more info, i'll contact the seller. I don't know where it comes from. Thank you. Anne.

Hello everyone ! Need a bit of help here . this 3 pieces shown below has been offered to me as Ankylosaur osteoderm from Judith River formation. I have a bad memory about Ankylosaur scute before so i want a bit of help in Identification of these 3 pieces before buying. thank you in Advance ! Guns ==Number 1== ==Number 2== ==Number 3==

I found this interestingly pitted piece of bone in Wyoming's Lance formation over the summer and my initial thoughts were ankylosaurian osteoderm. I've been wrong in the past with various Ceratopsid skull elements deceiving me, but I am hopeful to add this to my comparatively short list of remains from these living tanks. I'd appreciate any feedback from my fellow forum members. Dimensions are about 8 cm in length, 5 cm in width, ~3 cm in depth.

Hello ! This one is one of my first fossil . I bought it nearly about 6 mo ago as Partial Ankylosaur osteoderm (scute) from Hell creek formation , Montana . I have a hard time distinguish it from ceratopsian frill ... need help to confirm/correct ID on this bone and I wound love to know what is the main feature that distinguish Ankylosaur scute from Ceratopsian frill bone ?? thank you in advance ! Guns

This is a chunk I found in the Horseshoe Canyon Formation, specifically in the Horseshoe Canyon area. It’s shape and ridges look almost identical to a small Ankylosaur/Nodosaur osteoderm, but the texture suggests a random chunk of ironstone. I’m leaning towards ironstone, but I think there’s a chance it could be a really smooth osteoderm. Would any of you guys be able to tell for sure? Thanks!

Hello, hope everyone is doing well. I wanted to share with you what I believe to be an ankylosaur or nodosaur tooth I found while hunting through my bag of Aguja fm matrix from western texas. The tooth is about 7 mm in length and has a bulge at the base which curves to become flattened as the crown continues. I hope I got this ID right as it would be my first Ankylosaurian tooth I've ever found.

Hi all, Unfortunately I have no location info on this tooth which i know is really important but the seller can't obtain this information as it was from an old collection of someone that passed away. Does the morphology match Ankylosaurus or nodosaur rather than Pachy and Thescelosaurus? Thanks Jai

This report is a bit late, but better late than never! During late July through to mid August 2018 i was on a research trip to study a new Canadian dinosaur footprint site for my Masters degree project. I am based in Australia, and this was the first time i had been to Canada! So of course i had to make the most of it and pay a visit to the world renowned Dinosaur Provincial Park in southern Alberta, arguably the richest site in the world for dinosaur fossils. The park is the best exposure of the Dinosaur Park Formation (which it is now named after), which dates to about 76.5 million years ago during the mid-Campanian. I had long read about this location and watched it on documentaries for so many years growing up as a kid. Finally being there in person was very surreal! I was quite lucky and managed to go on a long, extended walk through the park with one of the guides for about 6 hours in total. In this relatively short amount of time i observed so many amazing fossils. I must have been completely desensitised within the first 30 minutes! It really is incredible how much fossil material there is lying all over the park. In Australia, whole scientific papers are written about isolated or fragmentary dinosaur bones, yet here they were just lying everywhere! The pictures really speak for themselves. As said, all of these fossils were observed in the field during a single days visit to the park. As this is a World Heritage site, nothing was taken, all finds were put straight back onto the ground after i took these photos. It's a VERY hard thing to do, but rules are rules. The only thing that was removed from the park on my trip was my best find of the day... a near-perfect 5.3 cm tyrannosaur tooth from Gorgosaurus!!!! This find was too special to leave behind, so the park tour guide GPS marked the location and brought it back for display, likely at the visitor centre or as a demonstration piece for their guided tours. To say that i have found a tyrannosaur tooth is a great honour! You may remember it from the July 2018 VFOTM poll. Without further ado, here are the pics! It is going to take multiple posts to fit them all in, so scroll all the way down to see them all! Various dinosaur vertebrae. Everything from hadrosaurs (duck billed dinosaurs) and ceratopsians (horned dinosaurs) to theropods (two legged meat eaters) and ankylosaurs (armoured dinosaurs). These were so common! I would probably pick a new one up every 5 minutes or so. Ankylosaur tooth

Hi i was wondering how to tell ankylosaur from ceratopsian vertabrea? Thanks.

Is this ankylosaur skin it matches the euoplcephalus skin above found in dinosaur provincial park.

Hi all, I am considering buying this fossil and I was wondering whether it is a ankylosaur spike or a bone? I was wondering what peoples opinions of this are? Many Thanks, Danny

Found several, 25-30 of these yesterday. Seem more like spikes to me. Can anyone confirm if they are from an Ankylosaur?

Closer inspection to my collection of bone pieces from trips to the Lance formation in Wyoming has resulted in me wondering if I had a few pieces of Ankylosaur osteoderm in my possession. I want to know what the folks on the forum think.

Fossil of new dinosaur discovered in Texas by Hillsboro paleontologist, KWTX, April 22, 2019 https://www.kwtx.com/content/news/Fossil-of-new-dinosaur-discovered-in-Texas-by-Hillsboro-paleontologist--508882331.html New Dinosaur Discovered in Texas, Now What Should We Call It, Stryker, The 1063 Buzz, April 22, 2019 https://1063thebuzz.com/new-dinosaur-discovered-in-texas-now-what-should-we-call-it/ Yours, Paul H.

One of my goals is to bring a very tactile element to our education programs. I think adding a piece of dino armor is going to be a real hit with the kids. I have been trying to brush up on ankylosaur and nodosaur scutes in preparation of getting one at some point in the near future. I am not to the level of being able to recognize them yet but I did see one in our price range. I am not sure about this one. The seller lists it as being from Hell Creek. It is 2.5"x1.5" and is 1/2 inch thick. Anybody have any thoughts about this one ?