Troodon Posted April 24, 2018 Share Posted April 24, 2018 Location: Morocco Kem Kem Beds To often Crocodile jaws are composited with Spinosaurid teeth and sold as Spinosaurus jaws. So the purpose of this topic is to show the diagnostic features of Spinosaurid jaws First its extremely rare that any jaw from this region contains functional teeth. Germ/unerupted teeth are more common but those are typically well into the tooth cavity and not protuding above the jaw line. So its highly probable that those you see sold with teeth are composited. We currently do not know if there is a variation between the jaws of the different Spinosaurids described or yet to be discovered in this region so there could be some difference between them but the general characteristics should be similar. Here is a composite skull in private hands and paleontologist Cristophe Hendrickx drawing of that skull Dentary: This is Stromers original plate. 1) You can see the variation in the lateral (side) view of jaw. A very wide anterior end and more V shaped toward the hinge. So jaw sections that you see sold which are straight across are probably crocodile. 2) The teeth are also not positioned in a straight line, and not always next to one another. 3) The most telling feature is the lip on the labial side. It should be present across the entire length of the jaw 4) Broken dentary jaw sections being sold should wide not narrow like croc's Closeup of Lip Close up of germ/unerupted teeth Premaxillary/Maxillary Much more robust than dentary however the lip feature is still present but on the lingual side. Very wide in lateral view. http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0144695 dal Sasso, C.; Maganuco, S.; Buffetaut, E.; Mendez, M.A. (2005). New information on the skull of the enigmatic theropod Spinosaurus with remarks on its sizes and affinities. Journal of Vertebrate Paleontology. 25 (4): 888–896. doi:10.1671/0272-4634(2005)025[0888:NIOTSO]2.0.CO;2 Maxilla for sale with composite teeth Link to comment Share on other sites More sharing options...
doushantuo Posted April 24, 2018 Share Posted April 24, 2018 Link to comment Share on other sites More sharing options...
LordTrilobite Posted April 24, 2018 Share Posted April 24, 2018 3 hours ago, Troodon said: Dentary: This is Stromers original plate. 1) You can see the variation in the lateral (side) view of jaw. A very wide anterior end and more V shaped toward the hinge. So jaw sections that you see sold which are straight across are probably crocodile. 2) The teeth are also not positioned in a straight line, and not always next to one another. 3) The most telling feature is the lip on the labial side. It should be present across the entire length of the jaw 4) Broken dentary jaw sections being sold should wide not narrow like croc's Though the relative thickness will likely be very similar, I would like to point out that there are definitely also younger Spinosaurids present that are less than half of adult size. So there is a possibility of coming across smaller jaw specimens. 2 hours ago, doushantuo said: Wow that's a really different reconstruction of the Angaturama snout on C. Normally it's reconstructed as being very square. Olof Moleman AKA Lord Trilobite Link to comment Share on other sites More sharing options...
Jaimin013 Posted April 24, 2018 Share Posted April 24, 2018 Thanks! This is really helpful! Link to comment Share on other sites More sharing options...
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