Phocaena crassidens Owen, 1846 p.516; Type locality- England, UK.
Pseudorca crassidens: Kuroda, 1938 p.18; Kim et al., 2000 p.86; Kim, 2004 p.238.
Range: Observation of the false killer whale occur during early summer to late autumn in the East Sea, especially near the coast of Gyeongsangbuk Province (Kim 2004; Fig. 95).
Remarks: The false killer whale, long considered a monotypic species, is now recognized by several stocks (Carretta et al. 2010). The Central North Pacific and Eastern North Pacific stocks are significantly differentiated from each other based on mtDNA analysis (Chivers et al. 2007, 2010).