Gravios are apart of the Flying Wyvern classification. They are the adult form of the Basarios and are distant relatives of Monoblos, Diablos, and Varusaburosu. Its unknown if Gravios have subspecies, however, Black Gravios have been seen though they aren't subspecies of Gravios but just individuals that were badly burnt by lava while they were Basarios. Living in the Desert is Gravios' ancestor known as Gureadomosu.