Key to species of Genus Mesoplodon in Korea

1 White pattern present on throat................................................................. M. stejnegeri

- White pattern absent on throat........................................................................... 2

2 Forehead flattened; male tusk very large; lower jaw massive with strongly arched contour................. M. densirostris

- Long forehead with small rounded melon; male has small flattened tusks that barely protrude from gum line of the middle of lower jaw (female tusk absence); jawline strongly arched........................................... M. ginkgodens