†order Birkeniiformes (vertebrate)
Petromyzontida - Birkeniiformes
Parent taxon: Cephalaspidomorphi according to J. J., Jr. Sepkoski 2002
Sister taxa: Gilpichthyidae, Pipisciidae, Ateleaspis, Cephalaspidida, Galeaspidiformes, Cephalaspidiformes, Atelaspidiformes, Pituriaspidiformes
Ecology: fast-moving nektonic carnivore
Distribution:
• Silurian of the United Kingdom (3 collections)
Total: 3 collections including 5 occurrences