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  Dolphin The name is srcinally from Greek  δελφίς  ( delphís ), dolphin , [1]  which was related to the Greek δελφύς  ( delphus ), womb . [2]  The animal's name can therefore be interpreted as meaning a 'fish' with a womb . [3]  The name was transmitted via the Latin  delphinus [4]  (the romanization of the   later Greek δελφῖνος –   delphinos [5] ), which in Medieval Latin became dolfinus  and in Old   French  daulphin , which reintroduced the  ph  into the word. The term mereswine  (that is, sea pig ) has also historically been used. [6]  The term 'dolphin' can be used to refer to, under the suborder  Odontoceti, all the species in the family Delphinidae (marine dolphins including orcas and pilot whales) and the river dolphin families Iniidae (South American river dolphins),Pontoporiidae (La Plata dolphin), Lipotidae (Yangtze   river dolphin) and Platanistidae (Ganges river dolphin and Indus river dolphin). [7][8]  This term has often been misused in the US, mainly in the fishing industry, where all small cetaceans (dolphins and porpoises) are considered porpoises, while the fish  dorado  is called dolphin fish. [9]  In common   usage the term 'whale' is used only for the larger cetacean species, [10]  while the smaller ones with a beaked or longer nose are considered 'dolphins'. [11]  The name 'dolphin' is used casually as a synonym for  bottlenose dolphin, the most common and familiar species of dolphin. [12]  Killer   whales also belong to the family Delphinidae and therefore qualify as dolphins. Though the terms 'dolphin' and 'porpoise' are sometimes used interchangeably, porpoises are not considered dolphins and have different physical features such as a shorter beak and spade-shaped teeth; they also differ in their behavior. Porpoises belong to the family Phocoenidae and share a common ancestry with the Delphinidae. [12]      A group of dolphins is called a school or a pod . Male dolphins are called bulls , females cows and young dolphins are called calves . [13]   Taxonomy Common dolphin     Bottlenose dolphin    Spotted Dolphin     Atlantic Spotted Dolphin    Commerson's Dolphin    Dusky Dolphin     Killer whales, also known as Orcas The Boto , or   Amazon River Dolphin       Suborder Odontoceti, toothed whales    Family Delphinidae, oceanic dolphins     Genus  Delphinus      Long-beaked common dolphin,  Delphinus capensis        Short-beaked common dolphin,  Delphinus delphis        Genus  Tursiops        Common bottlenose dolphin,  Tursiops truncatus        Indo-Pacific bottlenose dolphin,  Tursiops aduncus        Burrunan dolphin,  Tursiops australis , a newly discovered species from the sea   around Melbourne in September 2011. [14]        Genus  Lissodelphis        Northern right whale dolphin,  Lissodelphis borealis        Southern right whale dolphin,  Lissodelphis peronii         Genus  Sotalia      Tucuxi,  Sotalia fluviatilis      Costero,  Sotalia guianensis      Genus  Sousa      Indo-Pacific humpback dolphin,  Sousa chinensis      Chinese white dolphin (the Chinese variant), Sousa chinensis chinensis         Atlantic humpback dolphin,  Sousa teuszii         Genus  Stenella       Atlantic spotted dolphin,  Stenella frontalis        Clymene dolphin,  Stenella clymene        Pantropical spotted dolphin,  Stenella attenuata        Spinner dolphin,  Stenella longirostris      Striped dolphin,  Stenella coeruleoalba       Genus  Steno      Rough-toothed dolphin,  Steno bredanensis        Genus  Cephalorhynchus        Chilean dolphin,  Cephalorhynchus eutropia        Commerson's dolphin,  Cephalorhynchus commersonii         Heaviside's dolphin,  Cephalorhynchus heavisidii         Hector's dolphin,  Cephalorhynchus hectori         Genus  Grampus        Risso's dolphin,  Grampus griseus        Genus  Lagenodelphis        Fraser's dolphin,  Lagenodelphis hosei         Genus  Lagenorhynchus         Atlantic white-sided dolphin,  Lagenorhynchus acutus        Dusky dolphin,  Lagenorhynchus obscurus      Hourglass dolphin,  Lagenorhynchus cruciger         Pacific white-sided dolphin,  Lagenorhynchus obliquidens        Peale's dolphin,  Lagenorhynchus australis        White-beaked dolphin,  Lagenorhynchus albirostris        Genus  Orcaella       Australian snubfin dolphin,  Orcaella heinsohni         Irrawaddy dolphin,  Orcaella brevirostris      Genus  Peponocephala      Melon-headed whale,  Peponocephala electra      Genus  Orcinus      Killer whale (Orca), Orcinus orca      Genus  Feresa      Pygmy killer whale,  Feresa attenuata        Genus  Pseudorca      False killer whale,  Pseudorca crassidens      Genus  Globicephala        Long-finned pilot whale,  Globicephala melas        Short-finned pilot whale,  Globicephala macrorhynchus        Genus †  Australodelphis       †  Australodelphis mirus        Family Platanistidae     Ganges and Indus river dolphin,  Platanista gangetica  with two subspecies    Ganges river dolphin (or Susu), Platanista gangetica gangetica      Indus river dolphin (or Bhulan), Platanista gangetica minor         Family Iniidae      Amazon river dolphin (or Boto), Inia geoffrensis        Orinoco river dolphin (the Orinoco subspecies), Inia geoffrensis humboldtiana         Araguaian river dolphin (Araguaian boto), Inia Araguaiaensis        Bolivian river dolphin,  Inia boliviensis        Family Lipotidae       Baiji (or Chinese river dolphin), Lipotes vexillifer   (possibly extinct, since December 2006)      Family Pontoporiidae       La Plata dolphin (or Franciscana), Pontoporia blainvillei   
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