In most respects, it would have looked like a modern dolphin or porpoise, but its upper jaw was elongated into a sharp tip similar to that of a swordfish.

[2] Compared with earlier fossil species, Eurhinodelphis had complex ears, suggesting that it already hunted by echolocation like modern whales.

Its brain was also asymmetrical, a trait found in modern dolphins, and possibly associated with the complexities of navigating its environment.

Du Bus in a paper read before the Royal Academy of Sciences of Belgium on 17 December 1867.

O. Abel studied and illustrated the European species in a series of articles published in 1901, 1902 and 1905; subsequently, fossil skulls found in the Calvert Formation in Maryland and Virginia could be attributed to this genus.