Abstract
ABSTRACT Hybodontiformes are considered the closest relatives of modern sharks and were the dominant shark group throughout most of the Mesozoic. Although, originally a marine group, during their long temporal range, they conquered the freshwater environment. This is the case of numerous taxa known in northern Gondwana. Here, we report the presence of the hybodontiform Aegyptobatus in the Albian-Cenomanian Alcântara Formation of the São Luis Basin, Northeastern Brazil. A comparison made with other hybodontiform teeth from the Northern Gondwana suggests that the teeth from the Alcântara Formation is noticeably the same species found in the late Cenomanian Bahariya Formation of Egypt, A. kuehnei. Although probably restricted to freshwater, the new discovery increases the geographic range of this taxon, adds one more common taxon between the Brazilian Alcântara Formation and Cretaceous units of North Africa, and extends the temporal range of this taxon down into the Albian-Cenomanian.
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