Key to species of Genus Stenella in Korea

1 Body spotted; mandibular symphysis relatively long (>17% of mandible length)........................... S. attenuata

- Body not spotted; mandibular symphysis short (<17% of mandible length)........................................ 2

2 Stripe from eye to anus present; rostrum short and wide (length/breadth ratio <3)....................... S. coeruleoalba

- Stripe from eye to anus absent; rostrum long and slender (length/breadth ratio>3)........................ S. longirostris