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Showing results for tags 'theropod'.
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Hi everyone! Online I found this tooth for sale, the seller presents it as Afrovenator abakensis tooth from Tiouraren Hill in Niger. In my limited experience I know that it is not always easy to identify which species or genus the found teeth belong to. In this case, from the photos, is it possible to understand if it is really an Afrovenator or maybe another species?
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Spinosaurid Rooted Tooth (Composite root?)
Meatasaurus93 posted a topic in Is It Real? How to Recognize Fossil Fabrications
I recently picked up this "rooted" spinosaurid tooth, and I wanted to get some feedback on it. I have provided both the seller's original pictures and pictures I took of the tooth. My best guess is that there are authentic root elements present, but it's a composite piece. There is a clear seam that runs along the center of the root, indicating that the bottom half of the root was attached to the rest of the tooth. That doesn't always mean that it's a composite, but it's really hard to tell whether the two halves are associated. My inclination is they are not, but I am also not an expert on rooted theropod teeth. The base of the root looks real, but from mid-root up to the base of the crown, it's really hard to tell what is filler and what is root. Normally, I wouldn't pick up a tooth that was this questionable, but the seller assured me I could return it if I wasn't happy with it. I look forward to reading your responses to this topic. Seller's pictures: My pictures: I circled the seam/break that I mentioned above:
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Did Tyrannosaurus ever colonize the Eastern U.S. during the Late Cretaceous
Joseph Fossil posted a topic in General Fossil Discussion
Tyrannosauridae Dinosaur diversity was unique in the Western and Eastern areas of the North American Continent during the Late Cretaceous era around 95-66 Million Years ago) as a result of a seaway the cut the continent in two (creating the continents of Laramidia (now Western North America) and Appalachia (now Eastern North America)). By the Maastrichtian stage of the Cretaceous 68 Million Years ago, the seaway decreased in size and a land bride formed between Laramidia and Appalachia. https://deeptimemaps.com/western-interior-seaway/ This is around the same time Tyrannosaurus rex emerged in Laramida and other Tyrannosauridae including the smaller Dryptosaurus lived in Appalachia. Map of the currently known Tyrannosaurus rex fossil discovery sites Maps of the currently known Maastricthian Tyrannosauridae fossil discovery sites in Eastern North America (not shown on the maps here are Late Cretaceous Tyrannosauridae fossil sites in South Carolina and North Carolina) https://paleobiodb.org/navigator/ What I'm wondering is even with this land bridge formed, what prevented Tyrannosaurus from colonizing the Eastern portion of North America during the Maastricthian Cretaceous? If it didn't prevent this, has there been any fossils found in the Eastern portion of North America that belong to the Tyrannosauridae genus Tyrannosaurus?
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Found a partial theropod claw and some other one, not sure if it’s even a claw but I figured I would check. dinosaur park fm
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Hey all, Curious to see if you have similar thoughts about this tooth. In terms of that possibility that it's not, in fact, from the Jurassic, I'm not sure I'm seeing the kind of denticle shape/hooking and marginal undulations of Majungasaurus. From Isalo IIIb in the Mahajanga basin of Madagascar CH: About 27.6mm CBL (carina-to-carina): 13.9mm CBW (mesial side to distal side): 7.5mm Mesial Serration Density: 2.2mmm Distal Serration Density: 1.9/mm Thank you!
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Hi all, Curious to know what family you think this tooth likely came from. Could it be Allosaurid? From Isalo IIIb in the Mahajanga basin of Madagascar CH: About 27.5mm (estimating for tip) CBL (carina-to-carina): 14mm CBW (mesial side to distal side): 8.5mm Mesial Serration Density: 1.9mmm Distal Serration Density: 2.1/mm Thank you!!
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Hi everyone! I have my eye on what looks like a nice Spinosaur claw from the kem kem, or at least that what the seller claims it is. It does seem to have that round divot under the base of the proximal end that I've seen described as telltale, but you can never be to careful with kem kem claws which might just be the most outright faked fossil on the market so I figured I'd ask for an independent opinion on the potential of funny business (besides what looks to be one or two repaired breaks near the tip). Measurements given are 8.5 x 3 cm. Any insight is appreciated as always!
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Hi everyone! I've had this little Kem Kem tooth for a while now and was hoping for some help IDing it. My gut is telling me premax, maybe from a little Carch which I'm guessing from the thickness though it will probably wind up in the indet. Theropod pile. No base to provide CBL and CBW so I took measurements at the best cross section that was left. There is a mesial carina though it is very subtle and only extends halfway down the specimen's length. Any insight is appreciated as always!
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Fragment takes up most of the sediment which is 1.5cm please not the serrations in the photos. All photos are the same with different lighting. @Troodon @jpc Is this actually a tooth fragment or are the serrations fooling me?
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Big news today impacting the ongoing controversy if large theropods were lipped. Abstract: Large theropod dinosaurs are often reconstructed with their marginal dentition exposed because of the enormous size of their teeth and their phylogenetic association to crocodylians. We tested this hypothesis using a multiproxy approach. https://www.science.org/doi/10.1126/science.abo7877 Mark Witton blog http://markwitton-com.blogspot.com/2023/03/new-paper-fresh-evidence-and-novel.html
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The other day, I was indebted to you for the spinosaurus vertebral fossil. I have a question. Does the dinosaur's air sac match the marked part in the picture? The fossil in the photo is the sacrum of spinosauridae. Thank you . (⌒‐⌒)
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Is there a way to distinguish the vertebral of theropods and ornithopods? They the same to the untrained eye.
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Hello, I saw this tooth labeled as an allosaurus from the Morrison formation. Not sure if it’s allosaurus but does look to be. Tooth is from Moffat Counth Colorado. Also is that a sauropod tooth on the matrix on the 2nd pic? Allo tooth is 4.1 cm. Thanks.
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Hi all. This is my take on Deltadromeus agilis, the "agile delta runner". Here it is chasing a nice fat beetle.
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Just want to get some opinions before I purchase a tooth. Do you guys think this is definitely a Dakotaraptor tooth? Or does it look more Nano? Size is .71” and it’s from Hell Creek Formation, Garfield County, Montana. 24506BD7-17AC-42BF-B3C6-7C613A84332B.webp 31C05BFB-8621-4C95-9A7A-4A92A0C553D7.webp E6280DD3-5623-4D78-966F-F7A20751CEFB.webp 7CFB9AAF-269D-48B6-A26E-5265AE476524.webp E04ED762-40B5-42D1-BADA-52A77A44425B.webp
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Is this a theropod claw? Also, is this from Niger, rare? Please tell me. Thanks in advance.
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So when I purchased this tooth it was listed as Timurlengia, however I know there have been recent discoveries of both a large Dromaeosaurid and carcharodontosaurid from this formation. Is there any way to figure out if this is Tyrannosauroid for sure? Uzbekistan - Bissekty Formation @Troodon
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HI all! I am pretty sure this is a theropod tooth - it has carinae but only on one side. It's curve is odd though. I can't quite seem to place an ID on it. Any help will be appreciated! It's 4 mm
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Just purchased this phalanx toe bone. It was sold as Spinosaurus, however I guess it's impossible to ID it like that. Just want confirmation it's indeed a theropod phalanx toe bone. Location: Taouz, South Morocco Size: 4cm (1.58")
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Hi everyone, I recently acquired a batch of small theropod teeth and was hoping to get a second opinion on some ids since a few seem kinda special. The first one I'm really leaning towards Dakotaraptor. 2-5 I'm not sure. They're all very similar looking but have very different base shapes including oval, almond, pinched rectangle, and pinched almond. The serration densities are also very interesting. The mesial serrations on all are much smaller than the distal serrations. The last one I think is a really tiny T-Rex. It's a dead ringer for a large Rex just very small. All six are from The Hell Creek of Carter County, Montana. Any insight is greatly appreciated as always! Tooth 1: Tooth 2: Tooth 3: Tooth 4: Tooth 5: Tooth 6:
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This is a digital study of the head of Rugops primus. I screwed up some of the teeth (too recurved). I really should know better, haha.
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Hello and good evening. I found that in an unexplored area besides a river ,in a village close to Athens, Greece. Through research i find many similarities with claws of small theropods. Its size is around 3 cm length. Any ideas what exactly is it? Appreciate your time.
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I bought this tooth and in my limited knowledge I'm not sure it's a raptor, I do not have a big collection of teeth to compare it to, so I figured I'll ask the experts. Hellcreek formation, MT. 4 denticles/mm it's the same both sides, 13.6mm CH, 4.2mm CBW, 9.07mm CBL both sides denticles look the same to me. If any more pictures are needed, I can get them. also sorry about the photos I'm getting a better magnifying device, my little coin one isn't too good for big over all pictures.
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New paper on cf. Spinosaurus dental pathology. https://www.sciencedirect.com/science/article/pii/S0195667123000277 Paywalled
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