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Additional
dolphins
English Wikipedia - The Free Encyclopedia
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Dolphin
Dolphins
are a widely distributed and diverse group of fully aquatic
marine mammals
. They are an informal grouping within the order
Cetacea
, excluding
whales
and
porpoises
, so to zoologists the grouping is
paraphyletic
. The dolphins comprise the extant families
Delphinidae
(the oceanic dolphins),
Platanistidae
(the Indian
river dolphins
),
Iniidae
(the new world river dolphins), and
Pontoporiidae
(the
brackish
dolphins). There are 40 extant species of dolphins. Dolphins, alongside other
cetaceans
, belong to the clade
Cetartiodactyla
with
even-toed ungulates
, and their closest living relatives are the
hippopotamuses
, having diverged about 40 million years ago.
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