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Fish

Submitted by nicolae on Tue, 06/10/2008 - 14:02
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Centropristis striataCentropristis striata

Classification

Fish are a paraphyletic group: that is, any clade containing all fish also contains the tetrapods, which are not fish. For this reason, groups such as the "Class Pisces" seen in older reference works are no longer used in formal classifications.

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