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List of sharks
Sharks
belong to the superorder
Selachimorpha
in the subclass
Elasmobranchii
, in the class
Chondrichthyes
. The Elasmobranchii also include
rays
and
skate
s; the Chondrichthyes also include
Chimaeras
. The first sharks appeared in the
oceans
440 million years ago.
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