Cetacea

The order Cetacea includes the marine mammals commonly known as whales, dolphins, and porpoises. Cetus is Latin and is used in biological names to mean "whale". Cetology is the branch of marine science associated with the study of cetaceans. Fossil evidence suggests that cetaceans share a common ancestor with land-dwelling mammals that began living in marine environments around 50 million years ago. For more information, visit the Wikipedia entry. Get back to Eutheria
Baleen whales (Mysticeti)	Toothed whales (Odontoceti)	Archaeoceti

Baleen whales are characterized by having baleen plates for filtering food from water, rather than having teeth. This distinguishes them from the other suborder of cetaceans, the toothed whales or Odontoceti. Living species of Mysticeti have teeth only during the embryonal phase. Fossil Mysticeti had teeth before baleen evolved. For more information, visit the Wikipedia entry. Get back to Cetacea
Blue whale	Bowhead whale	Bryde's whale	Fin whale
Gray whale	Humpback whale	†Mammalodon	Minke whale
Right whale	Sei whale

The toothed whales (systematic name Odontoceti) form a suborder of the cetaceans, including sperm whales, beaked whales, dolphins, and others. As the name suggests, the suborder is characterized by the presence of teeth rather than the baleen of other whales. For more information, visit the Wikipedia entry. Get back to Cetacea
Beaked whales	Beluga whale	†Livyatan
Narwhal	Oceanic dolphins	Porpoises
Pygmy sperm whale	River dolphins	Sperm Whale

Archaeoceti is a paraphyletic group of primitive cetaceans that lived from the Early Eocene to the late Oligocene (55 to 23 million years ago). Representing the earliest cetacean radiation, they include the initial amphibious stages in cetacean evolution and are thus the ancestors of both modern cetacean suborders, Mysticeti and Odontoceti. This occurred in the shallow waters that separated India and Asia 53 to 45 mya. For more information, visit the Wikipedia entry. Get back to Cetacea
Basilosaurus

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