connorp Posted April 6, 2022 Share Posted April 6, 2022 I've found a large number of similar looking, but fragmentary, multicuspid petalodont teeth in the LaSalle Limestone (Late Pennsylvanian) of Illinois. This is one of the more complete specimens I've found. I haven't been able to find a comparable specimen in literature, and was hoping somewhere here might have some thoughts. 3 Link to comment Share on other sites More sharing options...
DPS Ammonite Posted April 6, 2022 Share Posted April 6, 2022 Clearer photos would help. Looks sort of like Peripristis semicircularis. Please wait for the real experts. http://www.thefossilforum.com/index.php?/gallery/image/12812-peripristis-semicircularis-14mm/ Paper about LaSalle Formation shark teeth: https://www.researchgate.net/profile/Stephen-Brusatte/publication/233606122_Pennsylvanian_Late_Carboniferous_chondrichthyans_from_the_LaSalle_Limestone_Member_Bond_Formation_of_Illinois_USA/links/0fcfd50c8e457bae63000000/Pennsylvanian-Late-Carboniferous-chondrichthyans-from-the-LaSalle-Limestone-Member-Bond-Formation-of-Illinois-USA.pdf?origin=publication_detail 1 2 My goal is to leave no stone or fossil unturned. See my Arizona Paleontology Guide link The best single resource for Arizona paleontology anywhere. Link to comment Share on other sites More sharing options...
Jared C Posted April 6, 2022 Share Posted April 6, 2022 reminds me of a tooth in the running for vertebrate fossil of the month right now “Not only is the universe stranger than we think, it is stranger than we can think” -Werner Heisenberg Link to comment Share on other sites More sharing options...
deutscheben Posted April 11, 2022 Share Posted April 11, 2022 (edited) From looking at my old Geological Survey of Illinois volumes, this most closely matches ones identified as Ctenopetalus and Ctenoptychius. However, I couldn't tell you what the current state of those genera are- petalodonts still seem pretty mysterious. Nice tooth, though! Edited April 11, 2022 by deutscheben 1 Link to comment Share on other sites More sharing options...
Fossildude19 Posted April 11, 2022 Share Posted April 11, 2022 @jdp Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
jdp Posted April 12, 2022 Share Posted April 12, 2022 Could be Peripristis. Could even be Belantsea or something similar; a lot of these tooth taxa doesn't necessarily line up with body taxa. Link to comment Share on other sites More sharing options...
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