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April 13 2013

Primitive fish with 'butt fins' reveals evolution's quirky path


An evolutionarily unique "paired anal fin" suggests that evolution experimented with various wacky body plans, only some of which survived.

A 370-milion-year-old primitive fish sported a weird pair of fins just below its anus, new research shows.

The strange appendages, detailed today (April 9) in the journal Biology Letters, were found on an ancient jawless fish called Euphanerops longaevus that lived around the time that jawless fishes like lampreys split off from jawed vertebrates, which include everything from sharks to humans.

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