Dictionary of Human Evolution and Biology

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Crossopterygian

Vernacular for an ancient subclass of Osteichthyes (bony fishes) composed of the pre-dominantly fresh-water lobe-finned fishes. Until recently this group was considered to be the progenitor of the terrestrial tetrapods; that proposal is now disputed both on molecular and morphological grounds. The only living member of this group is the coelacanth, Latimeria.