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I was recently given a tooth collection a relative of mine has built up over the years and somebody on reddit said that I should come here to verify my ceratosaurus tooth, as he said it is hard to identify one. If anybody could check this out, it would be appreciated.

Paper describes a large theropod from Uruguay represented by isolated teeth which resemble Ceratosaurus. I dont have access to this paper but it will be interesting to see the multvariate analysis results and be able to compare these teeth to those found in Portugal. What is interesting in the highlights is that they propose that the spinosaurid Ostafrikasaurus crassiserratus from Tanzania should be referred as a ceratosaurid theropod. Paywalled: https://www.sciencedirect.com/science/article/abs/pii/S0895981120303242

Hi I’m wondering what Ceratosaurus and other horned Theropods used there horns for? I’ve heard it was display but I’ve also heard it was for pushing rivals. Is there any evidence for these? Thank you!!

Hands are very important to everyone including Dinosaurs .. here are some photos of your not so ordinary ones ........both herbivore and theropod. Some pretty cool configurations.. Paper on the evolution of Theropod dinosaur Hands https://onlinelibrary.wiley.com/doi/full/10.1111/joa.12719 The evolution of the manus of early theropod dinosaurs is characterized by high inter‐ and intraspecific variation Daniel E. Barta, Sterling J. Nesbitt, Mark A. Norell First published: 08 November 2017 https://doi.org/10.1111/joa.12719 Have to thank Joao Vasco Leite for a bunch of these photos and info.from Twitter From the Triassic dawn of Dinosaurs here is the left hand of Herrerasaurus from Argentina Also from the late Triassic a sauropodomorph Plateosaurus, a beautiful specimen From the Early Jurassic of Argentina the ariticulated hands of the sauropodomorph Adeopapposaurus , wow The Jurassic brought us Dilophosaurus and sorry Jurassic Park fans there is no conclusive scientific evidence that it could spit poison Staying in the Jurassic here is Allosaurus and the different growth stages of its hand claws Also from the Morisson the tiny hand of the herbivore Camptosaurus The Jurassic also brought us the exquisite left forelimb of the stegosaur Gigantspinosaurus, from the Zigong Dinosaur Museum Stegosaurus hand material is quite rare, especially fairly complete ones. Morisson Formation One of the classics, first described by O.C. Marsh back in 1884. The left hand of Ceratosaurus. The bone to the right is metacarpal I, the first bone of the "thumb" . Have to wonder what it was used for. The Late Jurassic theropod Tanycolagreus ..cast From the early Cretaceous the hand of the recently described alvarezsaurid, Bannykus from China Also from the Early Cretaceous of Utah the left hand of Cedrorestes an iguanodontian Everyones favorite the hands of Deinonychus

Collectors talk about the small arms of T. rex, but have you seen the arms of Carnotaurus? The entire arm was vestigial and likely useless. Right to left, weird humeri, radius-ulna, and metacarpals-phalanges. Image and tech info by João Vasco Leite Holotype skull of Utah's first big tyrannosaurid, holotype of Tetratophoneus as displayed at Brigham Young University. vs U of U's prepped skull from Utah's most perfectly complete tyrannosaurid skeleton; both Kaiparowits Fm Provided by Jim Kirkland Did you know that Ceratosaurus a theropod had osteoderms? These lumpy bumps may not look like much, but they are super cool! You are looking at osteoderms that lined the back of the horn-snouted Jurassic theropod Ceratosaurus. Info and photo by Scott Persons Did you know that theropod anatomy makes it pretty much impossible to turn hands palm down Make sure you have volume turned up. Growth series of Allosaurus femora from the Cleveland-Lloyd Dinosaur Quarry, Photo by Oliver Demuth Here are the bones of Hadrosaurus foulkii on display at the Philadelphia Academy of Natural Sciences This was the first partially-coseemplete dinosaur skeleton ever found, and the first dinosaur skeleton ever mounted for display- by Benjamin Waterhouse Hawkins.. Nice place to visit if youre in Philadelphia. Everyone talks about the spines "sail" on Spinosaurus check out the display of Amargasaurus a sauropod from the Museum in Patagonia. Cool cervical neural spines. Photo by Serjoscha Evers Here are teeth from Dicraeosaurus teeth a diplodocoid sauropod dinosaur from Tanzania. The one on the far right is erupted and worn down whereas the other three are unworn replacement teeth. Photo from Amy Campbell

I recently saw a ceratosaurus nascornis tooth for sale which is described as this: Very Rare 3.5 cm Kimmeridgian, Late Jurassic Ceratosaur Theropod Dinosaur Tooth from the Morrison Formation, Colorado, USA. How does it look?

Hi everyone! As I have mentioned several times, being a 3D artist I am trying to move into the field of paleoart. Recently I have started modeling Ceratosaurus nasicornis in 3D, and I really want to make it as accurate and plausible as possible. Here is what I have got so far: a basic model done in 3ds Max. After this I am planning to take it to ZBrush and add more muscle definition, sking wrinkles, scales and other fine details. At this stage this is just the base and I would like to share it with you guys in order to receive some feedback from those who know their dinosaur anatomy. Did I get the shape and overall structure right? Constructive criticism is more then welcome, pretty much this is what I am asking for here. 1. Mesh 2. Body 3. Perspective 4. Back 5. Top view 6. Head close-up

Is ceratosaurus dentisulcatus the biggest known of its species ? would its tooth be different from its other species tooth length,size and serrations ? is there any difference between magnicornis and nasicornis ?

Some of you might remember my other thread in which I collected a group of Cretaceous marine predators. It was a process that took 3 years > http://www.thefossilforum.com/index.php?/topic/48360-predators-of-the-cretaceous-seas-teeth-set/ Now I'm ready to begin my next collection, but first I need to gather some info to see if this is even a viable endeavor. As thread title suggests, I'm going for theropods this round. The commonly seen ones like Nanotyrannus, North American Tyrannosaurs etc I'm not too worried. It's those big four in the title that has me wondering if I can even complete this. Has anyone seen them anywhere?

Ceratosaurus is one of my favorite Jurassic theropod Dinosaurs found in the Morrison Formation. Teeth of this and other theropods are commonly sold through online Dealers, Auction Houses and at Fossil shows. Just because a site/dealer sells Jurassic material does not guarantee accuracy. . Variation of the teeth in the jaw also adds to the complexity. Isolated teeth from the Morrison Formation are very difficult to diagnose and all require an understanding of additional characteristics than normal, in hopes of properly identifying them. I have not been able to find any publication that describes the teeth of this species, other than anterior ones, so it's beyond me how Sellers identify them. The best I can do is to look at other reference publications some which include similar teeth from Portugal and Germany which describe morph types and then assign them to the best taxon. So until we have a better definition this is a start to get us in the right direction Sellers need to provide you the following information: 1)Photo of tooth and one of the mesial edge 2)Serration density of both edges, 5 mm wide at midline 3)Dimensions: CBL, CBW, CH 4)Locality: State and County Premaxillary & Anterior teeth of Dentary Tooth: CHR : 2.47 - 3.56 Crown height ratio CH÷CBL CBR : .92 - 1.43 Crown base ratio CBW÷CBL Mesial Density: 19 per 5 mm, Distal Density: 11.5 per 5 mm all at midline, DSDI > 1.2 (Denticle Size Density index) Cross-section base : Subcircular Lingual grooves (flutes) are diagnostics and on the lingual side only. Gooves are only present on premaxillary and the anterior three teeth of the dentary. Lateral teeth (From Germany) Tooth: CHR : 1.54 - 2.86 Crown height ratio CH÷CBL CBR : .32 - .5 Crown base ratio CBW÷CBL Mesial Density: 14 per 5 mm, Distal Density: 14 per 5 mm all at midline Cross-section base : very compressed oval Mesial and Distal carina extend to the base If you would like to learn more about Ceratosaurs, bones and teeth there is a great soft covered printing. Ceratosaurs (Dinosauria, Theropoda) A Revised Osteology by Madsen and Welles by the Utah Geological Survey Its also available on PDF but the book is cheap and a great reference guide. If anyone has additional information to add to this please post it. Reconstruction Skull of Ceratosaurus from Utah Museum of Natural History. So you can see variation of the teeth in jaw Reference 1)Journal of Iberian Geology June 2017, Volume 43, Issue 2 , pp 257-291 Analysis of diversity, stratigraphic and geographical distribution of isolated theropod teeth from the Upper Jurassic of the Lusitanian Basin, Portugal 2)Multivariate and Cladistic Analyses of Isolated Teeth Reveal Sympatry of Theropod Dinosaurs in the Late Jurassic of Northern Germany Oliver Gerke, Oliver Wings Published: July 6, 2016 https://doi.org/10.1371/journal.pone.0158334