Dolphins are a widely distributed and diverse group of fullyaquatic marine mammals. They are an informal grouping within theorder Cetacea, excluding whales and porpoises, so to zoologists thegrouping is paraphyletic. The dolphins comprise the extant familiesDelphinidae (the oceanic dolphins), Platanistidae (the Indian riverdolphins), Iniidae (the new world river dolphins), andPontoporiidae (the brackish dolphins).
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There are 40 extant species of dolphins. Dolphins, alongside othercetaceans, belong to the clade Cetartiodactyla with even-toedungulates, and their closest living relatives are thehippopotamuses, having diverged about 40 million years ago.
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