The naming of the Borealosuchus genus was born out of a revision of the genus Leidysuchus which has a reputation as something of a ‘wastebasket taxon’. So far four former species of Leidysuchus have been renamed as species of Borealosuchus, though two further species have now also been named.
Borealosuchus was a mid-sized genus of crocodile, with the largest species B. acutidentatus attaining lengths of two hundred and eighty centimeters in length, with a skull thirty-six centimeters long. Borealosuchus is also another genus of crocodile that survived the KT extinction that marked the end of the dinosaurs, pterosaurs, and the great marine reptiles. It may be that the physiological and ecological characteristics of crocodiles allowed them to survive this extinction event as other crocodile genera such as Dyrosaurus and Brachychampsa are also known to have made it through this extinction even