Even-toed ungulates


 * Artiodactyla/Cetartiodactyla
 * Tylopoda
 * †Anoplotheriidae?
 * †Cainotheriidae
 * †Merycoidodontidae
 * †Agriochoeridae
 * Camelidae: camels and lamoids or llamas (7 extant and 13 extinct species)
 * †Oromerycidae
 * †Xiphodontidae
 * Artiofabula
 * Suina
 * Suidae: pigs (19 species)
 * Tayassuidae: peccaries (4 species)
 * †Sanitheriidae
 * Cetruminantia
 * Cetancodontamorpha
 * †Andrewsarchus?
 * †Entelodontidae
 * Whippomorpha
 * †Raoellidae
 * Dichobunoidea – paraphyletic to Cetacea and Raoellidae
 * †Dichobunidae
 * †Helohyidae
 * †Choeropotamidae
 * †Cebochoeridae
 * †Mixtotheriidae
 * Ancodonta
 * †Anthracotheriidae – paraphyletic to Hippopotamidae
 * Hippopotamidae: hippos (two species)
 * Cetacea: whales (about 90 species)
 * †Archaeoceti
 * †Pakicetidae
 * †Ambulocetidae
 * †Remingtonocetidae
 * †Basilosauridae
 * Mysticeti: baleen whales
 * Balaenoidea: right whales
 * Balaenidae: greater right whales (four species)
 * Cetotheriidae: pygmy right whale (one species)
 * Balaenopteroidea: large baleen whales
 * Balaenopteridae: slender-back rorquals and humpback whale (eight species)
 * Eschrichtiidae: gray whale (one species)
 * Odontoceti: toothed whales
 * Delphinoidea: oceanic dolphins, porpoises, and others
 * Delphinidae: oceanic true dolphins (38 species)
 * Monodontidae: Arctic whales; narwhal and beluga (two species)
 * Phocoenidae: porpoises (six species)
 * Physeteroidea: sperm whales
 * Kogiidae: lesser sperm whales (two species)
 * Physeteridae: sperm whale (one species)
 * Platanistoidea: river dolphins
 * Iniidae: South American river dolphins (two species)
 * Lipotidae: Chinese river dolphin (one species, possibly extinct)
 * Platanistidae: South Asian river dolphin (one species)
 * Pontoporiidae: La Plata dolphin (one species)
 * Ziphioidea
 * Ziphidae: beaked whales (22 species)
 * Ruminantiamorpha
 * Ruminantia
 * Tragulina
 * †Amphimerycidae
 * †Prodremotheriidae
 * †Protoceratidae
 * †Hypertragulidae
 * †Praetragulidae
 * Tragulidae: chevrotains (six species)
 * †Archaeomerycidae
 * †Lophiomerycidae
 * Pecora
 * †Gelocidae
 * †Palaeomerycidae
 * Antilocapridae: pronghorn (one species)
 * †Climacoceratidae
 * Giraffidae: okapi and four species of giraffe (five species total)
 * †Hoplitomerycidae
 * Cervidae: deer (49 species)
 * †Leptomerycidae
 * Moschidae: musk deer (seven species)
 * Bovidae: cattle, buffalo, goat-antelope, antelope, and others (135 species)