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  1. The two most prominent hypothesizes on the direct evolutionary origin of perhaps the most famous Theropod Dinosaur from the fossil record, Tyrannosaurus Rex (Tyrannosauridae, Late Cretaceous (68-66 Million Years ago)) are what I call the Laramidia and Asian Origins. The Laramidia origin (named after the region of the Western North America which was a separate Continent during most of the Late Cretaceous and home to a vast amount of dinosaurs including Tyrannosaurus rex) hypothesizes that Tyrannosaurus rex is the direct descendent of and evolved from slightly older North American T
  2. Hello everyone, I've had this topic on my mind for a while now and thought I'd ask the forum to see if anyone has any knowledge or information related to this. We all know about the various transitions to land done by plants, arthropods and most famously tetrapods but one I don't see often discussed is that of gastropods. I wanted to ask here if anyone has any resources where I could learn more about this transition(s) I think it would be really interesting to know when, and how it happened. I don't even know if we have much information about this since snails don't tend to foss
  3. Came accross this news shared by the NHM Maastricht, another fossil bird has been discribed from the same quarry and layer in which the famous wonderchicken "Asteriornis" was found. This being the Romontbos quarry in Eben-Emael in Belgium (near de border with Maastricht in the Netherlands) which dates to the Late Maastrichtian era (66,7 mya) Here are some links to the news articles (both in english as in dutch) as well as as video. https://www.theguardian.com/science/2022/nov/30/ct-scans-toothed-bird-fossil-jaw-mobile-palate-avian-evolution https://www.bbc.com/news/uk
  4. Mammalian ancestors became warm-blooded some 20 million years later than previously estimated, according to European scientists who analyzed inner ear fossils to solve "one of the greatest mysteries of palaeontology”. https://ca.sports.yahoo.com/news/scientists-reveal-origin-mammal-evolution-164538839.html Mammaliomorphs are the ancestors of mammals. They would have been the first to be hot-blooded. PHOTO: UNIVERSITY OF LISBON/LUZIA SOARES
  5. Is it just plants, or can other organisms do it? Life existed before plants, so presumably there had to be another way. Sorry if this is a silly question.
  6. hi one cool video from stenberg museum about evolution of whales. enjoy
  7. This is about a 330 mya vampyropod, with soft body preservation, and an ancestor of octopuses. LINK TO ARTICLE
  8. I know that tooth shape depends on where it is located in the sharks jaw. When looking closely at the teeth I noticed not just different blade characteristics, but also differences in the root and cusps. On the larger tooth the cusps are much less pronounced. As for the roots, one has a “u” shape and the other a “v” shape. My intuition tells me they are from different stages of evolution of the Angustidens shark, but I don’t know. Are thes differences just a result of the size of shark and tooth position?
  9. I have finally managed to persuade a teacher to let me do an at least slightly paleontological essay so i'm really happy, however the topic i'm doing is quite broad but i do have 1.5k words to summarise it in, i would like briefly outline the key crossroads in the evolutionary lineage of humans, i have shortened these to: Sarcopterygii-tetrapods , reptile to mammal, 4 legged to 2 legged , i would appreciate any opinions on this and any literature that anyone knew would be helpful, thanks again, will
  10. Trying to nail down the evolutionary chain of Carcharodon carcharias and its pretty figured out until you get to the very beginnings... It seems that either Isurolamna inflata or Cretolamna schoutedini are the earliest relatives in the evolutionary development of carcharias, but I'm looking for some expert advice.... I know that Carcharodon plicatilis is rightfully disputed but is included as a reference... Isurolamna inflata ? Macrorhizodus praecursor Carcharodon hastalis Carcharodon plicatilis Carcharodon hubelli Carcharodon ca
  11. Why do we see so many examples of intelligent animals today, such as crows, elephants, whales and pigs, but none in previous biospheres? Why didn't the Cretaceous evolve such a level of intelligence? Or the Permian?
  12. So last year my friend Jared Voris named both Thanatotheristes degrootorum and Daspletosaurini (as you all probably know). For the past year a few others and I been studying this clade (you probably all know as well) and have been able to put up a good argument for two unnamed and controversial Daspletosaurus species, one from the Dinosaur Park Formation of Alberta and the other from the Judith River Formation of Montana. This presents that there’s most likely 4 Daspletosaurus species, there’s also been evidence of a possible (note possible, just kind of a guess based of age and location) Th
  13. At work, I study convergent antibody evolution in response to COVID vaccination. When you have a chisel everything around you is shale, so during my internet endeavors in paleontology, I find a lot of questions coming up for me about trilobite convergent evolution, particularly between the Moroccan and North American species with which I am most familiar. This thread will be a few different posts of species which have really stood out to me as similar, and I would be delighted if others shared their own observations! For a little background which got me thinking on the topic- I'm
  14. When it comes to evolutionary lineages that tend to be represented by flow charts, would it be viable to also represent/reorganize them into hypothetical cladograms? Considering that flow charts continue to be used for certain lineages (i.e. Lamnidae), I am feeling the possibility that there might be something that makes the interpretation of such charts incompatible with cladograms. For example, below are evolutionary lineages for Isurus and Carcharodon per Heim (1996) and Canevet & Lebrun (2018) (left and right respectively) that I translated into possible cladograms. If this
  15. Taxonomic debate over extinct lamniformes remains a big thing, but I've noticed that it seems like there hasn't been any studies that use modern phylogenetic techniques (i.e. maximum parsimony) to resolve issues with extinct taxa (i.e. Carcharodon, Isurus, Macrorhizodus, Otodus). Is there a reason for this absence, or perhaps I simply have not come across one that already exists? I suppose it's possible that dental characteristics alone as character codes for a phylogenetic matrix may not be viable...
  16. Earth's mountains disappeared for a billion years, and then life stopped evolving A dead supercontinent may be to blame By Brandon Specktor, Live Science Tang, M., Chu, X., Hao, J. and Shen, B., 2021. Orogenic quiescence in Earth’s middle age. Science, 371(6530), pp.728-731. Yorus, Paul H.
  17. For those with an interest in hominin paleontology this article describes the discovery of a significant find, a Paranthropus robustus skull. https://www.bbc.com/news/world-australia-54882214 Here is a link to the actual paper in Nature Ecology and Evolution (paywalled). https://www.nature.com/articles/s41559-020-01319-6
  18. https://phys.org/news/2020-10-giant-lizards-learnt-millions-years.html?fbclid=IwAR1QVtoiNraBjhR0co0ae7Ajt9UxfBkjtIqwrLQMYhmCEr_XQlqFN5pW4VE Scientific journal: 150 million years of sustained increase in pterosaur flight efficiency, Nature (2020). DOI: 10.1038/s41586-020-2858-8 , www.nature.com/articles/s41586-020-2858-8
  19. ThePhysicist

    Harding Sandstone Microfossils

    Back in May or so I got my hands on some micromatrix from the Harding Sandstone, CO, USA. This formation dates back to the Ordovician: ~450-475 mya. It's chock full of some really cool and important fossils. It has some of the earliest vertebrate material, and some of the earliest steps in the evolution of teeth! I hope this is an informative and fun look into an important period in life's history. If you feel I have mischaracterized something or have left out pertinent information, please do speak up! I do also plan to post more pictures as I sort through material. If there's something specif
  20. https://phys.org/news/2020-06-million-year-old-fish-resembles-sturgeon-evolutionary.html?fbclid=IwAR3FE_g9MI_kaL_Nc25IdxqjMQ3F2cfBCq33zml_J4gRkPMkh8nPecNsYjw Jack Stack et al, Tanyrhinichthys mcallisteri, a long-rostrumed Pennsylvanian ray-finned fish (Actinopterygii) and the simultaneous appearance of novel ecomorphologies in Late Palaeozoic fishes, Zoological Journal of the Linnean Society (2020). DOI: 10.1093/zoolinnean/zlaa044
  21. https://phys.org/news/2020-06-microfossil-spectroscopy-dates-earth-animals.html?fbclid=IwAR15tVkP0pUuvoyi-8ByQN2_GC-wRxUSND-0xkRdv5meV0zwY16MbPNGiqo Ross P. Anderson et al. Aluminosilicate haloes preserve complex life approximately 800 million years ago, Interface Focus (2020). DOI: 10.1098/rsfs.2020.0011
  22. Just watched fascinating documentary on equid evolution- bout half on the origin (Dawn horse), then progresses to present-day..........Bone
  23. I am new to collecting meg teeth so I hope my question is not “dumb.” Are the tooth cusps on a C. chubutensis vestigial structures from the earlier three pronged tooth like on O. obliquus? I read a physics article about how the megs tooth serration evolves from the smaller prong teeth getting sharks caught on larger prey causing them damage. Did the improved serration as the sharks evolved to be larger lead adult C. megladon adults not having cusps at all? I hope the question makes sense.
  24. I keep thinking I must just be stupidly forgetting/overlooking something, but I haven’t been able to come up with it in a long time. There were birds during the Mesozoic(hesperonis, for example), long before theropods evolved into birds(after the Mesozoic, right? I thought all the already very bird-like Dino’s, like archaeopteryx, dead-ended at the end of the Mesozoic)....what am I missing, here? I’ve been looking at bird evolutionary charts, and none of them seem to make sense of that. I’m not all that learned on this topic, but there are things I at least THOUGHT I knew about it, but I’
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