bcfossilcollector Posted September 13, 2019 Share Posted September 13, 2019 Hi. Just thought I’d try to verify the identification of this tooth. The seller claims it is a Megalosaurid tooth from the Lourinha Formation of Portugal. Unfortunately this is the best image of the tooth I have for now. Will try to obtain others. Link to comment Share on other sites More sharing options...
bcfossilcollector Posted September 13, 2019 Author Share Posted September 13, 2019 Better photo. Link to comment Share on other sites More sharing options...
bcfossilcollector Posted September 13, 2019 Author Share Posted September 13, 2019 Tooth is small. Less than an inch. Thanks. Link to comment Share on other sites More sharing options...
bcfossilcollector Posted September 13, 2019 Author Share Posted September 13, 2019 @Troodon @-Andy- @paulyb135 Link to comment Share on other sites More sharing options...
fossilsonwheels Posted September 13, 2019 Share Posted September 13, 2019 This paper may help you a little. It is a pretty good analysis of Jurassic Theropod teeth from Germany including Megolosaurid teeth. The paper is not paywalled so you can access it. https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0158334 2 Link to comment Share on other sites More sharing options...
-Andy- Posted September 13, 2019 Share Posted September 13, 2019 I do not own any Portuguese teeth myself so I can't help. I have seen Portuguese supposed-Megalosaurids from more than one seller and trader though 1 Looking forward to meeting my fellow Singaporean collectors! Do PM me if you are a Singaporean, or an overseas fossil-collector coming here for a holiday! Link to comment Share on other sites More sharing options...
paulyb135 Posted September 13, 2019 Share Posted September 13, 2019 Like Andy, I don’t own any Portuguese material so I may not be able to help as well as others. that being said, I know the seller and have messaged him so hopefully he can give some reasoning and help 1 Link to comment Share on other sites More sharing options...
DinoFossilsUK Posted September 13, 2019 Share Posted September 13, 2019 I always break out in a cold sweat when I see one of my teeth on the forum! Okay, well there's not a lot of information on teeth from this formation so when I do get teeth from the Lourinhã & Alcobaça Formations they're usually labelled theropod indet. However the guy who collected the tooth seemed to think this was a Megalosaurid tooth (he's been collecting dino teeth in Portugal for a couple of decades) and after studying the tooth and doing a bit of reading I agreed with him. That paper fossilsonwheels mentioned was useful. The one linked below (HENDRICKX 2015) was too. For this tooth, the serration count on the mesial carina is approximately 5/mm and on the distal 4.2/mm, making the DSDI 1.19. The crown base width is 3mm and length 6mm, giving a crown base ratio of 0.5. Also, the mesial carnina stops short of the base. All of that seems in line with what you'd expect from a Megalosaurid tooth, not to mention the shape of the serrations and tooth overall. Hope I haven't overreached with the ID but I'm fairly confident in it, especially so given the guy who collected it initially thought it was a Megalosaurid tooth too. Here's that paper on the dentition of Megalosaurid theropods: app000562013 627 642(1).pdf 3 Link to comment Share on other sites More sharing options...
DinoFossilsUK Posted September 13, 2019 Share Posted September 13, 2019 Here's some more close ups of the serrations 1 Link to comment Share on other sites More sharing options...
DinoFossilsUK Posted September 13, 2019 Share Posted September 13, 2019 1 Link to comment Share on other sites More sharing options...
bcfossilcollector Posted September 13, 2019 Author Share Posted September 13, 2019 58 minutes ago, DinoFossilsUK said: You have been very helpful and I thank you! Link to comment Share on other sites More sharing options...
DinoFossilsUK Posted September 13, 2019 Share Posted September 13, 2019 8 minutes ago, bcfossilcollector said: You have been very helpful and I thank you! No problem! Link to comment Share on other sites More sharing options...
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