Diplacanthiformes (also known as Diplacanthida, Diplacanthoidei, or Diplacanthini) is an order of "acanthodian" stem-chondrichthyans which lived during the Devonian Period.
Subtaxa incertae sedis Genus Bryantonchus Genus Culmacanthus Genus Devononchus Genus Striacanthus Genus Tetanopsyrus Family Diplacanthidae Genus Angelacanthus Genus Diplacanthus Genus Milesacanthus Genus Ptychodictyon Genus Rhadinacanthus Family Gladiobranchidae? Genus Gladiobranchus Genus Uraniacanthus?
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