† protamphirhinen.ZoologyObsoleterare a hypothetical common evolutionary ancestor of groups of fishes having two nostrils.
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1873 T. H. HuxleyCritiques & Addr. 317 From this ‘Protamphirhine’ were developed, in divergent lines, the true Sharks, Rays, and Chimæræ; the Ganoids, and the Dipneusta.