†Gyroplacosteus Obrutschev 1930 (armour-plated fish)
PaleoDB taxon number: 34343
Parent taxon: Holonematidae according to R. Denison 1978
Sister taxa: Belemnacanthus, Deirosteus, Deveonema, Groenlandaspis, Holonema, Megaloplax, Rhenonema, Tiaraspis, Tropidosteus
Subtaxa: Gyroplacosteus butovi, Gyroplacosteus panderi, Gyroplacosteus vialowi
Ecology: nektonic carnivore