Key to genera of Mustelidae in Korea

1 Feet webbed; tail thick; Premolars 4/3.................................................................. Lutra

- Feet without web...................................................................................... 2

2 Conspicuous pinnae; Premolars 4/4.................................................................. Martes

- Pinnae not conspicuous; Premolars 3/3..................................................................... 3

3 Bold black strip from eye to ear; stout body shape........................................................ Meles

- Body slender; hind foot <70 mm .................................................................... Mustela