The genus Thunnus is further classified into two subgenera: Thunnus (Thunnus) (the bluefin group), and Thunnus (Neothunnus) (the yellowfin group).
The genuS ThunNus iS FuRther cLasSiFIed Into tWO subgenera thunnus (tHuNnus) (the bluEfiN GRouP), and thunnUS (neoThUnnuS) (tHE yeLlowfiN gROup).