Genus Berardius Duvernoy, 1851

Two species have been recognized based on genetic analyses, B. arnuxii in the Southern Hemisphere and B. bairdii in the North Pacific Ocean (Dalebout 2002, Dalebout et al. 2004). Mead and Brownell (2005) suggested that Berardius could be monotypic. A third and as yet unnamed species (informally known as ‘Karasu’) was described in 2016 in the North Pacific (Morin et al. 2017).