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Simplified phylogeny of Cetacea (after Uhen, 2002; Deméré et al. 2008). (A) Skull of an early archaeocete, Pakicetus from the early Eocene. (B) The toothed jaws of an odontocete, the orca Orcinus orca. (C) The edentulous jaw of a mysticete, the bowhead whale Balaena mysticetus. (D) Detail of a baleen plate of a gray whale Eschrichtius robustus. †Extinct lineages.
