An order of marine mammals that comprises the whales, dolphins, and porpoises. These have a streamlined hairless body, no hind limbs, a horizontal tail fin, and a blowhole on top of the head for breathing. See also Mysticeti, Odontoceti.
- The order Sirenia is composed of manatees and dugongs, and the order Cetacea includes whales, dolphins, and porpoises.
- However, in a phylogenetic analysis of the complete mitochondrial genome of the Jamaican fruit bat it appeared more closely related to cetferungulates, a clade including Cetacea, Artiodactyla, Perissodactyla, and Carnivora.
- The order Cetacea comprises two extant sub-orders and one extinct sub-order.
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