= Carl Gegenbaur
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Researcher in comparative <anatomy> associated with the <gill-arch hypothesis of paired fin origins>. The hypothesis proposed a relationship between <gill>-supporting structures and <paired appendages>; its historical importance lies in turning anatomical similarities into a proposed evolutionary transformation.
\Image[https://commons.wikimedia.org/wiki/Special:Redirect/file/Carl_gegenbaur.jpg?width=260]
{title=Portrait of <Carl Gegenbaur>}
{description=Eduard Schultze. Public domain (PD-old-100-expired). https://creativecommons.org/publicdomain/mark/1.0/[Source usage terms], via Wikimedia Commons.}
{source=https://commons.wikimedia.org/wiki/File:Carl_gegenbaur.jpg}
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