New remains of Priohybodus arambourgi (Hybodontiformes: Hybodontidae) from Late Jurassic–?earliest Cretaceous deposits in Uruguay

We describe new multicuspid, laterally compressed, and serrated tooth crowns from the Batoví Member (Late Jurassic–?earliest Cretaceous) of the Tacuarembó Formation, Uruguay. These specialized tooth crowns are referable to Priohybodus arambourgi (Hybodontidae). Among them, there is a pathological crown with the second lateral cusplet larger than the first, a morphological feature not described before. The total number of lateral cusplets and the angle between the main cusp and the first pair of lateral cusplets reaches higher values than reported previously. We also provide measurements of the crowns and the first published scanning electron micrographs of the denticles. Finally, we review the temporal and geographical distribution of the species. The former appears to be restricted to the Kimmeridgian–Hauterivian/Barremian interval, which agrees with the age proposed for the Tacuarembó Formation on the basis of other evidence.