JamieLynn Posted February 8, 2023 Share Posted February 8, 2023 Found this very lovely little tooth in my Aguja Formation matrix (Brewster Co. of Texas) and while the root makes me think mammal, I'm not sure what to make of it. @ThePhysicist I saw you posted a Metatheria which looks very very similar, so am wondering if it is the same critter? 12 www.fossil-quest.com Link to comment Share on other sites More sharing options...
fossils-uk Posted February 8, 2023 Share Posted February 8, 2023 this is certainly some kind of primitive therian tooth. very interesting and the first i have seen from texas. 3 Link to comment Share on other sites More sharing options...
Mikrogeophagus Posted February 8, 2023 Share Posted February 8, 2023 Mesozoic mammals are fascinating. Drool worthy find whatever it may be 1 Link to comment Share on other sites More sharing options...
ThePhysicist Posted February 9, 2023 Share Posted February 9, 2023 Gorgeous tooth! It's certainly a mammal, which for those who don't know, are rare finds in the Mesozoic. It doesn't look like a Metatherian or Therian, rather a Multituberculate. It compares well with an upper 4th premolar of Cimolomys or something related, but I'm hardly an expert, @jpc is your guy. ^ Clemens: Fossil Mammals of the Type Lance Formation, I 6 1 2 "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...
JamieLynn Posted February 9, 2023 Author Share Posted February 9, 2023 @ThePhysicist - that looks remarkable like it! Thank you for the picture and info!! www.fossil-quest.com Link to comment Share on other sites More sharing options...
jpc Posted February 9, 2023 Share Posted February 9, 2023 Thanks for the reference letter, Physicist. Great find. Definitely a multituberculate upper 4th premolar, as The Physicist has pointed out. The publication he pulled the illustration from is for the Maastrichtian Lance Fm (valid for Hell Creek in general as well) I am not familiar with the TX material. I do not know if there is anything published on them, but try a google scholar search for "Aguja multituberculate". 4 Link to comment Share on other sites More sharing options...
doushantuo Posted February 9, 2023 Share Posted February 9, 2023 Fizz,the Clemens monograph is what i'd like to call "heavily unavailable" . You''re not going to tell me you have it,do you? @ThePhysicist Link to comment Share on other sites More sharing options...
doushantuo Posted February 9, 2023 Share Posted February 9, 2023 (edited) Some of you may like: Journal of Mammalian Evolution, Vol. 12, Nos. 1/2, June 2005 On the Occlusal Fit of Tribosphenic Molars: Are We Underestimating Species Diversity in the Mesozoic? P. David Polly, Steven C. Le Comber, and Tamsin M. Burland read it,by all means/heavily recommended Polly, Le Comber and Burland, 2005, Occlusal fits.pdf Edited February 9, 2023 by doushantuo Link to comment Share on other sites More sharing options...
jpc Posted February 9, 2023 Share Posted February 9, 2023 51 minutes ago, doushantuo said: Fizz,the Clemens monograph is what i'd like to call "heavily unavailable" . You''re not going to tell me you have it,do you? @ThePhysicist Heeee heeee, I do. : ) 1 Link to comment Share on other sites More sharing options...
jpc Posted February 9, 2023 Share Posted February 9, 2023 26 minutes ago, doushantuo said: Some of you may like: Journal of Mammalian Evolution, Vol. 12, Nos. 1/2, June 2005 On the Occlusal Fit of Tribosphenic Molars: Are We Underestimating Species Diversity in the Mesozoic? P. David Polly, Steven C. Le Comber, and Tamsin M. Burland read it,by all means/heavily recommended Polly, Le Comber and Burland, 2005, Occlusal fits.pdf 564.7 kB · 0 downloads Interesting, yes, but multis are not tribosphenic mammals. Link to comment Share on other sites More sharing options...
Troodon Posted February 9, 2023 Share Posted February 9, 2023 Missed this one but from the Aguja Fm. F: fourth premolar Link to comment Share on other sites More sharing options...
doushantuo Posted February 9, 2023 Share Posted February 9, 2023 The Campanian Terlingua local fauna, with a summary of other vertebrates from the Aguja Formation, Trans-Pecos Texas Journal of Vertebrate Paleontology Volume 12, 1992 - Issue 4 Timothy Rowe,Richard L. Cifelli,Thomas M. Lehman & Anne Weil The_Campanian_Terlingua_local_fauna_with_a_summary.pdf 1 Link to comment Share on other sites More sharing options...
jpc Posted February 9, 2023 Share Posted February 9, 2023 59 minutes ago, Troodon said: Missed this one but from the Aguja Fm. F: fourth premolar This (E and F) are the fourth LOWER premolar, even though the complete paper that doushanto posted above refers us to this figure while talking about the fourth UPPER premolar. Typo? on their part? I think so. The OP is 4th UPPER premolar. 1 Link to comment Share on other sites More sharing options...
ThePhysicist Posted February 10, 2023 Share Posted February 10, 2023 9 hours ago, jpc said: Thanks for the reference letter, Physicist. Great find. Definitely a multituberculate upper 4th premolar, as The Physicist has pointed out. The publication he pulled the illustration from is for the Maastrichtian Lance Fm (valid for Hell Creek in general as well) I am not familiar with the TX material. I do not know if there is anything published on them, but try a google scholar search for "Aguja multituberculate". Haven't seen much on Aguja multi's. Cimolomys I believe has been reported from other Campanian locales. Montgomery & Clark (2016) do include it as an ID for a tooth they found in Aguja. "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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