JamieLynn Posted February 21, 2023 Share Posted February 21, 2023 HI all! I am pretty sure this is a theropod tooth - it has carinae but only on one side. It's curve is odd though. I can't quite seem to place an ID on it. Any help will be appreciated! It's 4 mm 1 www.fossil-quest.com Link to comment Share on other sites More sharing options...
Troodon Posted February 21, 2023 Share Posted February 21, 2023 Most of these micro teeth from the Aguja are indeterminate. The irregular size and shape of the denticles is not typical of theropod teeth so not sure if it's one. An alternative candidate is Shark. You can see these micro teeth from the Aguja all have a consistent shape of denticles 2 1 Link to comment Share on other sites More sharing options...
JamieLynn Posted February 21, 2023 Author Share Posted February 21, 2023 @Troodon Shark...interesting. I have a paper that lists these sharks as being found in Aguja, but as far as I know none of them looks similar to this. Any thoughts on what genus it might be? Chondrichthyes Hybodus sp. This paper Lissodus selachos This paper; Standhardt, 1986 Cretorectolobus olsoni Standhardt, 1986 Odontaspis sp. Langston et al., 1989 Anomotodon angustidens Lehman, 1985a Scapanorhynchus texanus Lehman, 1985a Scapanorhynchus raphidon Langston et al., 1989 Scapanorhynchus sp. This paper; Russell, 1988 Squalicorax kaupi Lehman, 1985a Squalicorax sp. Russell, 1988 Onchopristis dunklei This paper Onchopristis sp. Davies, 1983; Russell, 1988 Ischyrhiza avonicola This paper Ischyrhiza mira Lehman, 1985a Squatirhina americana This paper; Standhardt, 1986 Ptychotrygon agujaensis McNulty and Slaughter, 1972; Langston et al., 1989; Russell, 1988 Phychotrygon sp. This paper; Lehman, 1985a; Standhardt, 1986 Myledaphus bipartitus Standhardt, 1986 Dasyatidae sp. This paper Psuedocorax (=Corax) sp. Wixson, 1963 Isurus sp. Wixson, 1963 Lamna appendiculata Langston et al., 1989 Cretolamna sp. www.fossil-quest.com Link to comment Share on other sites More sharing options...
ThePhysicist Posted February 21, 2023 Share Posted February 21, 2023 (edited) The only serrated sharks from this period are Squalicorax and less commonly, Pseudocorax, but the crown morphology isn't a match for either, even were it a terrible pathology. My guess is that it's a Permian Xenacanth cusp that snuck its way in, since the matrix seller also has Permian material (or you accidentally contaminated). This would be consistent with the gross morphology and irregular serrations on one carina. Edited February 21, 2023 by ThePhysicist 3 "Argumentation cannot suffice for the discovery of new work, since the subtlety of Nature is greater many times than the subtlety of argument." - Carl Sagan "I was born not knowing and have had only a little time to change that here and there." - Richard Feynman Collections: Hell Creek Microsite | Hell Creek/Lance | Dinosaurs | Sharks | Squamates | Post Oak Creek | North Sulphur River | Lee Creek | Aguja | Permian | Devonian | Triassic | Harding Sandstone Instagram: @thephysicist_tff Link to comment Share on other sites More sharing options...
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