Atlanticopristis (meaning "Atlantic saw") is an extinct genus of sclerorhynchoid that lived during the Late Cretaceous (Cenomanian) of what is now the Northeast Region of Brazil, between 100.5 and 93.9 million years ago.

Similar to modern sawfish, it would have had a long snout armed with modified fish scales shaped into "teeth", but the rostral denticles of Atlanticopristis had barbs on both sides.

In 2007, fourteen rostral denticles which were discovered in the Maranhão state of northeastern Brazil, at the Alcântara Formation of the Itapecuru Group on Cajual Island, were referred to as Onchopristis sp.

[2] Atlanticopristis belongs to the Sclerorhynchoidei, an extinct suborder of rajiform rays during the Cretaceous period that had long rostra with large denticles similar to sawfishes and sawsharks.

[2][4][5] Atlanticopristis and Onchopristis exhibit similarities to a Bolivian species of sclerorhynchoid Pucapristis branisi, such as the enamel ribbing and the formation of a barb on the posterior margin, however, their peduncles differ greatly.

[6] The formation, composed of Cretaceous sediments, outcrops at the coastline of the São Marcos Bay, and documents the separation of South America and Africa; while presenting a large quantity and variety of continental and marine vertebrates.

[2][7][6][8] The describers of Atlanticopristis suggested that the taxon likely came from the shallow marine regions of the southern Atlantic Ocean, and periodically entered estuarine waters.

The area that is now Laje do Coringa locality would have comprised tidal estuaries of rivers and lagoons, alongside these would have been large forests of conifers, horsetails, and ferns.

[2] Its remains have also been found in association with those of land-based animals like crocodilians and dinosaurs, including the spinosaurid Oxalaia quilombensis along with other indeterminate theropods and the mesoeucrocodylian Coringasuchus anisodontis.