Key to genera of Korean Otariidae

1 Pelage soft with dense underfur; the number of upper cheek teeth 6..................................... Callorhinus

- Pelage harsh without underfur............................................................................ 2

2 Five upper cheek teeth; length of mature males> 300 cm; length of mature females> 200 cm; postorbital process nearly square shaped (Fig. 59).............................................................................. Eumetopias

- Six (sometimes five) upper cheek teeth; length of mature males <300 cm, length of mature females <200 cm; postorbital process triangular and points posteriorly............................................................... Zalophus