Phlyctaenius is an extinct genus of placoderm fish, which lived during the Devonian period of New Brunswick, Canada. It was named by Traquair (1890)Traquair, R. H. (1890a). Notes on the Devonian fishes of Seumenac Bay and Campbelltown in Canada. Geol. Mag., London. 7: 15-22. as a replacement for Phlyctaenium Zittel (1879), which was preoccupied.Zittel, K. von. (1879)
One species, P. anglicus, was known from remains found in England and Wales and was initially described by Traquair (1890). It was moved to Heightingtonaspis when the genus was described by White (1969).White, E.I. (1969). The deepest vertebrate fossil and other arctolepid fishes. Biological Journal of the Linnean Society 1(3): 293-310
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