Delphinus is a genus of dolphin, commonly known as the "Common Dolphin". There are two species in this genus, the Short-beaked Common Dolphin ("Delphinus delphis"), and the Long-beaked Common Dolphin ("Delphinus capensis"). But some studies say that there is a third species, the "Arabian Common Dolphin" ("Delphinus tropicalis"), which has a long, thin beak and is found in the Indian Ocean and the Red Sea.