†order Atelaspidiformes (vertebrate)
Petromyzontida - Atelaspidiformes
Parent taxon: Cephalaspidomorphi according to J. J., Jr. Sepkoski 2002
Sister taxa: Gilpichthyidae, Pipisciidae, Birkeniiformes, Cephalaspidida, Pituriaspidiformes, Cephalaspidiformes, Galeaspidiformes, Ateleaspis
Subtaxa: Atelaspis Hemicyclaspis Witaaspis
Ecology: fast-moving nektonic carnivore
Distribution:
• Silurian of Canada (1: Nunavut collection), Estonia (4), the United Kingdom (2)
Total: 7 collections each including a single occurrence