Family PHOCOENIDAE Gray, 1825

Due to their morphological similarity with Delphinidae, the Phocoenidae were formerly included as a subfamily in the Delphinidae (Mead & Brownell 2005) . Based on differences in both morphology and mtDNA, Phocoenidae tends to be regarded as a distinct family (Nowak 2003; Mead & Brownell 2005). Three genera representing three species occur in the waters of Korea. Only Neophocaena asiaeorientalis is a common resident.