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Found 19 results

  1. Tomas Holtz published this paper that looks at theropod assemblages in most of the faunas during the Jurassic and Cretaceous period. You an take whatever you like from this document but what I found interesting was his presentation of the dinosaur communities (shown by sizes and which ones not present) in the different faunas (starts at line 1178) Examples below: https://tspace.library.utoronto.ca/handle/1807/106039 I understand why he excluded Nanotyrannus but not sure why Troodon was not included in the HC and Lance. He also excluded Zapsalis from the H
  2. FF7_Yuffie

    Hell Creek "theropod" vertebra

    Hello, I'm tempted by one of these verts I saw for sale. All labelled as Hell Creek theropod. Each is from Powder River County in Montana. There are 4 verts, some look similar, so I'll try and do 4 different posts. They are quite small, and most show a honeycomb type texture--which I think is a sign that they are carnivore? I am guessing, given the small size, that these would all be from one of the raptor species from Hell Creek. EDIT: It automatically merged them. Hope its clear which is which. Vert 1 - 2 inch long, 1.75 wide, 2.25 tall
  3. Shuvuuia: Extraordinary Dinosaurs That Hunted in the Dark University Of The Witwatersrand, SciTech Daily, May 7, 2021 The paper is: Choiniere, J.N., Neenan, J.M., Schmitz, L., Ford, D.P., Chapelle, K.E.J., Balanoff, A.M., Sipla, J.S., Georgi, J.A., Walsh, S.A., Norell, M.A. and Xu, X., 2021. Evolution of vision and hearing modalities in theropod dinosaurs. Science. Yours, Paul H.
  4. I periodically get asked about smaller theropod teeth so this is what I know. If you have additional tooth related information please pass it on since very little is known or published. Tanycolagreus topwilsoni The holotype included a fragmented skull with one premaxillary and two lateral teeth. Unfortunately the teeth were crushed with no visible serrations so its unknown how to describe them. Holotype skull Reconstruction Skull of Marshosaurus from Utah Museum of Natural History. So you can see variation of the teeth in jaw
  5. PetrosTrilobite

    Carcharodontosaurid or other theropod?

    I bought this tooth 5-6 weeks ago, as a carcharodontosaurid tooth. Very nice tooth, but, i think that the tooth is very flat for carcharodontosaurid. I don't have photos with the cross section, but try to imagine a tooth 1.94 inch long that is only 6-7 mm thick.
  6. PetrosTrilobite

    Largest theropods

    We all know that spinosaurus is most possible to be the largest theropod. Spinosaurus was not very tall (in the hip) but it probably was heavier and longest that tyrannosaurus, giga and carcha. But, what is the second biggest theropod ever? (only carnivorous, not herbivorous like deinocheirus). I think, that tyrannosaurus rex is the second biggest theropod ever. Giganotosaurus and carcharodontosaurus was longest that t. rex, but not tallest and heavier. Giraffe is taller that elephant, but elephant is the biggest terrestrial mammal. Argentinosaurus, supersaurus, patagotitan, diplodocus, was lo
  7. By measuring endocasts of theropods, ancient and modern birds these researchers traced brain evolution in 2000 different species. Decrease in body size with same size brain led to increased brain:body ratio in modern birds after the K-T event. Work done at Stonybrook and the Bruce museum. https://phys.org/news/2020-04-history-brain-evolution-tyrannosaurs-modern.html
  8. fossilsonwheels

    The Real Jurassic World Program

    Carter and I are starting to slowly begin work on a program that will be about Jurassic era Dinosaurs. We will not do this until the 2020/2021 school year and I am really pretty excited. We decided to stop pursuing other dinosaur fossils (except for a Hell Creek Anky/Nodo lol) so that we can start piecing this together. We have about 10 months to make this happen. Educationally speaking it will be awesome to focus a program on the Jurassic era and show kids what dinosaurs were really running around at this time. This presents some fun challenges for us as collectors. Morrison Forma
  9. Hi I’m wondering what Theropods are found in lightning Ridge Australia @Down under fossil hunter
  10. Matthew_Dino_Searcher

    Theropod data for a computer science study.

    Hello I am working on my PhD in computer science and am working on collecting data for my thesis. I have been looking for a lot of data on theropod measurements like; teeth size, body mass, femur and tibia, length width, and other measurements (the more the better). I would like to collect samples from a few theropods like the T-Rex, Raptors, ect... and to have multiple skeleton for each. I need to have their measurement for my data points. I know that there are some journals that give detailed measurement for each fossil they find but I do not know how to search for them as e
  11. Not sure if this is the correct place for this, but looking to see if I could get some verification (Is it real? Good quality?) etc as I’m fairly new to collecting.
  12. A new book (out early 2019) is available online: https://www.amazon.com/gp/product/0691180318/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1 I'm wondering if this book includes theropods described this year because I know that the Haarlem Archaeopteryx was recognized as the distinct genus Ostromia, and we know that Mahakala, Halszkaraptor, and Hulsanpes form a distinct clade of dromaeosaurids.
  13. Theropod dinosaur teeth are usually ziphodont, but the morphology of the denticles varies between species and clades. Gorgosaurus (a tyrannosaurid) and Dromaeosaurus (a dromaeosaurid) both have rectangular denticles despite differences in body size and shape and tooth size. Saurornitholestes (a dromaeosaurid) has pointed denticles that, over time, can wear down to resemble those of Dromaeosaurus. Troodontids (like Troodon) have unique hooked denticles that differ significantly from those of dromaeosaurids. Paper looks at the biomechanics of these different morphologies, not for everyone but i
  14. Ok this might be the most stupid question you have even had on here but it's bugging me and can't seem to get any good pages or images on google, and it is basically to do with the scapula and coracoid, how would it have been attached to the main skeletal system of theropods? as from looking at museum's and models it seem like it is just slapped on the side of the ribs which would not have provided much support or structure, and with sauropods would it have been attached to fused vertebrae like it would be for sacral vertebrae? Thanks for you time to read this. Matt
  15. This new analysis of dinosaurs and their near relatives, published today in the journal Nature, concludes that the ornithischians need to be grouped with the theropods, to the exclusion of the sauropodomorphs. It has long been known that birds (with their obviously ‘bird-like’ hips) evolved from theropod dinosaurs (with their lizard-like hips). However, the re-grouping of dinosaurs proposed in this study shows that both ornithischians AND theropods had the potential to evolve a bird-like hip arrangement- they just did so at different times in their history. http://www.nature.com/na
  16. Periodically you see theropod material offered for sale from Patagonia and to a collector that's awesome. Typically its specimens obtained before the embargo laws went into affect from Argentina. My experience in looking at what has been offered is that it's often mis-identified as to locality, age and species. Sellers put commonly known dinosaurs identification tags to their specimen like Carnotaurus with complete disregard to the actual age and locality of where that dinosaur was described. That may simply be the information provided to them but they don't verify it and it's easy to do.
  17. lone5wolf117

    Theropods teeths

    Theropods teeths form my collection Form left to right its Ceratosaurus dentisulcatus tooth from Lourinha formation Allosaurus rooted tooth from Morrison formation Juvernile Tyrannosaurus rex partial rooted tooth from Lance formation Deinonychus antirrhopus tooth from Cloverly formation Allosauridae tooth from Lourinha formation Timurlengia Euotica tooth from Bissekty formation Enjoy.
  18. doushantuo

    Tyrannosaurid cladistics

    reasonably new,don't know if it's been posted yet http://www.pnas.org/content/113/13/3447.full.pdf
  19. All of may not know this, but the Middle Jurassic La Boca Formation in Mexico boasts the most important Middle Jurassic tetrapod fauna in North America outside the US. Among the notable fossils found in the La Boca Formation are primitive mammals, sphenodonts, and even archosaurs (incl. the pterosaur "Dimorphodon" weintraubi and an unnamed mesoeucrocodylian). When compared to other Middle Jurassic faunas, it's interesting that the tritylodont Bocatherium is roughly the same age as the other two Middle Jurassic tritylodonts Bienotheroides and Stereognathus. As some of the components of the La B
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