I neglected to do an animal yesterday, so i'll have to make this one extra weird! Today's animal is! Atopodentatus Unicus! A triassic marine reptile with some bizarre dentition. The original describers theorized that it would be well adapted to an algae eating lifestyle, similar to a marine iguana. This is significant as there is no other prehistoric marine reptile adapted for herbivory.
Artist: https://www.deviantart.com/hyrotrioskjan/art/Atopodentatus-607899577
possibly scary looking marine reptile face
Interestingly due to a preservation error in the original specimen this animal was originally reconstructed as such, with a bizarre split upper jaw that was theorized to be used like a walrus's tusks in digging through substrate for prey items. What was actually the case was that specimens hammerhead like mouth had been compressed sideways during fossilization.
Artist: https://www.deviantart.com/malvit/art/Atopodentatus-unicus-432829298
you can see it in the skull of the original fossil specimen
However their is a competing hypothesis that the adaptations of the creatures jaw would also be fitting for a lifestyle of sifting invertebrates from the sea floor. Research on the animals tooth wear and isotope analysis will be required to figure this out conclusively.