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any of the group of mammals that includes elephants and their extinct relatives such as mammoths and mastodons. Although only three species of elephant are extant today, more than 160 extinct proboscidean species have been identified from remains found on all continents except Australia and Antarctica. Most of these were called gomphotheres, which belonged to a different family from elephants. Elephants and mammoths both belong to the only surviving proboscidean family, Elephantidae.