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In page Amphiuma:
"Numerous phylogenetic studies have indicated that amphiumas form a clade with the families Rhyacotritonidae (torrent salamanders) and Plethodontidae (lungless salamanders), with an especially close relationship to Plethodontidae. Despite this possible relationship, the two families must have still diverged very early on. The genus Proamphiuma from the Cretaceous is the earliest known member of the family, and closely resembles the modern species aside from less elaborate vertebral structures.[1][2]
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