Anomotodon Posted August 27, 2018 Share Posted August 27, 2018 Recently acquired this very nice tooth from Morrison fm, Moffat County, Colorado. I think it is Marshosaurus, am I right? I am afraid to clean it right now because the tooth is very fragile. Total length is ~1.6 cm. Ruler is in inches, so 1 line=1/16 inch=~1.5 mm, so distal serration density looks to be around 4/mm; mesial carina seems to end at bottom ~3/4 of the tooth, as I understand, these are Megalosaurid characteristics. Although I couldn't find any info on other medium-small sized theropods, like Tanycolagreus, Coelurus or Ornitholestes. Thank you for help! @Troodon By the way, took those pictures with AmScope USB microscope, very useful tool for detailed teeth 1 The Tooth Fairy Link to comment Share on other sites More sharing options...
Troodon Posted August 28, 2018 Share Posted August 28, 2018 Nice tooth. Isolated teeth from the Morrison are very difficult to ID just because nothing is published. Being so small does not help. I can try to compare it to info from the Lourinhã Fm of Portugal which is similar to the Morisson but need more info. Can you determine the density of the mesial edge? I also need the width and depth of the base, any chances since its in matrix. Prefer all measurements in mm. 2 Link to comment Share on other sites More sharing options...
Miocene_Mason Posted August 28, 2018 Share Posted August 28, 2018 12 minutes ago, Troodon said: nothing is published. 150 years of research and we still don’t have publications on teeth? Sad state of affairs. Someone needs to get a PhD student on that. “...whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been and are being evolved.” ~ Charles Darwin Happy hunting, Mason Link to comment Share on other sites More sharing options...
Troodon Posted August 28, 2018 Share Posted August 28, 2018 3 minutes ago, WhodamanHD said: 150 years of research and we still don’t have publications on teeth? Sad state of affairs. Someone needs to get a PhD student on that. Well nothing may be an overstatement but very very little is around. Love to see some publications if they are around. The only one I know is one Ceratosaurus 1 Link to comment Share on other sites More sharing options...
Anomotodon Posted August 29, 2018 Author Share Posted August 29, 2018 Was able to successfully prepare it, so here are more measurements: distal density ~4.5/mm mesial density ~4.5/mm (it seems that serrations end completely right near the tip, carinae extends maybe 2/3 further but with no serrations, doesn't seem that they were broken off) width of the base 11 mm height ~17 mm 3 The Tooth Fairy Link to comment Share on other sites More sharing options...
Troodon Posted August 29, 2018 Share Posted August 29, 2018 Great job thanks, let me look at all the info and compare it to some morph types. No idea if I can get closer to an ID but will try. Link to comment Share on other sites More sharing options...
Max-fossils Posted August 29, 2018 Share Posted August 29, 2018 10 hours ago, Troodon said: Great job thanks, let me look at all the info and compare it to some morph types. No idea if I can get closer to an ID but will try. Max Derème "I feel an echo of the lightning each time I find a fossil. [...] That is why I am a hunter: to feel that bolt of lightning every day." - Mary Anning >< Remarkable Creatures, Tracy Chevalier Instagram: @world_of_fossils Link to comment Share on other sites More sharing options...
Troodon Posted August 29, 2018 Share Posted August 29, 2018 Sorry missed it I need to do a CBR ratio need CBW : ? CBL is 11mm Its not Marshosaurus since the serration density is the same. Leaning to an Allosaurid at this point. 1 Link to comment Share on other sites More sharing options...
Anomotodon Posted August 29, 2018 Author Share Posted August 29, 2018 Thank you! Hard to tell exactly because it is in matrix, but CBW is about 3 mm, CBW:CBL=0.27. Actually, mesial density is 4.5 only at the very apical part, check the pictures. It seems that it decreases slightly before going to 0. Do Allosaurids have such a short mesial carina? The Tooth Fairy Link to comment Share on other sites More sharing options...
Troodon Posted August 30, 2018 Share Posted August 30, 2018 The Allosaurus tooth morphologies from Portugal show the mesial carina extending down some half others 2/3. I cannot find a good match with that very small thickness compared to length of the base of tooth possibly because it's been compressed in the matrix or because it's such a small tooth. The shape of the tooth, serration density and mesial carina all speak to Allosaurid. 2 Link to comment Share on other sites More sharing options...
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