PaleoNoel Posted June 13, 2021 Share Posted June 13, 2021 Hi everyone, tonight I wanted to share some pictures I took of the tiny chondrichthyan teeth I found in the Aguja matrix I got last year. I was hoping someone may be able to shed some light on their identity as there appears to be a few different types represented. 4 mm 3 mm 3 mm 5 mm Link to comment Share on other sites More sharing options...
ThePhysicist Posted June 13, 2021 Share Posted June 13, 2021 These are all Lissodus sp. Good references for Aguja teeth: http://www.jstor.org/stable/4523473?origin=JSTOR-pdf, https://ttu-ir.tdl.org/handle/2346/48849 1 "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...
siteseer Posted June 13, 2021 Share Posted June 13, 2021 35 minutes ago, ThePhysicist said: These are all Lissodus sp. Good references for Aguja teeth: http://www.jstor.org/stable/4523473?origin=JSTOR-pdf, https://ttu-ir.tdl.org/handle/2346/48849 I agree. You almost never find them with the roots preserved. 1 Link to comment Share on other sites More sharing options...
ThePhysicist Posted June 13, 2021 Share Posted June 13, 2021 33 minutes ago, siteseer said: I agree. You almost never find them with the roots preserved. Yes, quite uncommon. For reference, they look like this: 1 "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...
siteseer Posted June 13, 2021 Share Posted June 13, 2021 Yeah, I have one from South Dakota like that. Nice photos. Link to comment Share on other sites More sharing options...
PaleoNoel Posted June 14, 2021 Author Share Posted June 14, 2021 21 hours ago, ThePhysicist said: These are all Lissodus sp. Good references for Aguja teeth: http://www.jstor.org/stable/4523473?origin=JSTOR-pdf, https://ttu-ir.tdl.org/handle/2346/48849 20 hours ago, siteseer said: I agree. You almost never find them with the roots preserved. Thanks for your help, I've seen these referred to as Lissodus, especially on here, but elsewhere I've seen them referred to as Lonchidion selachos. After looking up Lissodus, it apparently went extinct in the Albian, while Lonchidion made it to the end of the Cretaceous and is present in places like the Hell Creek and Lance. The Jstor paper simply writes it as Lissodus (=Lonchidion) selachos. Link to comment Share on other sites More sharing options...
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