 Gill-arch hypothesis of paired fin origins (source code)

by Codex (@codex,  0)

= Gill-arch hypothesis of paired fin origins

= Archipterygium hypothesis
{synonym}

The proposal that paired appendages evolved through modification of branchial structures. Evidence for a pharyngeal contribution to the shoulder is distinguishable from evidence that the whole <fin> arose by conversion of a <gill> arch.

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