Family Ailuridae (red panda) Order Perissodactyla Family Equidae (horses, asses, zebras) Family Tapiridae (tapirs) Family Rhinocerotidae (rhinoceroses) Order Artiodactyla Family Suidae (hogs, pigs) Family Tayassuidae (peccaries) Family Hippopotamidae (hippopotamuses) Family Camelidae (camels, vicunas, guanacos, llamas) Family Tragulidae (chevrotains and mouse deer) Family Moschidae (musk deer) Family Cervidae (deer) Family Antilocapridae (pronghorn) Family Giraffidae (giraffe and okapi) Family Bovidae (antelope, bison, cattle, duikers, goats, sheep, etc.) Order Cetacea Family Balaenidae (right whales) Family Balaenopteridae (rorquals) Family Eschrichtiidae (gray whales Family Cetotheriidae (pygmy right whale) Family Delphinidae (ocean dolphins) Family Monodontidae (narwhal and beluga) Family Phocoenidae (porpoises) Family Physeteridae (sperm whales) Family Platanistidae (Ganges and Indus river dolphins) Family Iniidae (baiji, franciscana, and Amazon river dolphins) Family Ziphiidae (beaked whales) McKenna/Bell classification In 1997, the classification of mammals was revised by Malcolm C. McKenna and Susan K. Bell. The Classification of Mammals Above the species level, here referred to as the "McKenna/Bell classification", is a comprehensive work on the systematics, relationships, and occurrences of all mammal taxa, living and extinct, down through the rank of genus. The authors worked together as paleontologists at the American Museum of Natural History, New York. McKenna inherited the project from Simpson and, with Bell, constructed a completely updated hierarchical system, covering living and extinct taxa that reflects the historical genealogy of Mammalia. The McKenna/Bell hierarchical listing of all of the terms used for mammal groups above the species includes extinct mammals as well as modern groups, and introduces some fine distinctions such as legions and sublegions and ranks which fall between classes and orders that are likely to be glossed over by the layman. Click on the highlighted link for a table comparing the traditional and the new McKenna/Bell classifications of mammals. Extinct groups are represented by †. Subclass Prototheria (monotremes) Order Platypoda: platypuses Family Ornithorhynchidae: platypuses Order Tachyglossa: echidnas (spiny anteaters) Family Tachyglossidae: echidnas Subclass Theriiformes Infraclass †Allotheria Order †Multituberculata: multituberculates Family †Plagiaulacidae Family †Bolodontidae Family †Hahnodontidae Family †Albionbaataridae Family †Arginbaataridae Family †Kogaionidae Suborder †Cimolodonta Family †Sloanbaataridae Superfamily †Ptilodontoidea Family †Cimolodontidae Family †Ptilodontidae Superfamily †Taeniolabidoidea Family †Cimolomyidae Family †Eucosmodontidae Family †Taeniolabididae Suborder †Gondwanatheria Family †Ferugliotheriidae Family †Sudamericidae Infraclass †Triconodonta Family †Austrotriconodontidae Family †Amphilestidae Family †Triconodontidae Infraclass Holotheria Family †Chronoperatidae Superlegion †Kuehneotheria Family †Kuehneotheriidae Family †Woutersiidae Superlegion Trechnotheria Legion †Symmetrodonta Family †Shuotheriidae Order †Amphidontoidea Family †Amphidontidae Order †Spalacotherioidea Family †Tinodontidae Family †Spalacotheriidae Family †Barbereniidae Legion Cladotheria Sublegion †Dryolestoidea Order †Dryolestida Family †Dryolestidae Family †Paurodontidae Family †Donodontidae