†family Hardieopteridae Tollerton 1989 (eurypterid)
Parent taxon: Kokomopteroidea according to J. C. Lamsdell 2025
See also Dunlop et al. 2013, Dunlop et al. 2020 and Lamsdell et al. 2010
Sister taxon: Kokomopteridae
Subtaxa: Athenepterus Hallipterus Hardieopterus Tarsopterella Waterstonopterus
Type: Hardieopterus
Ecology: nektobenthic carnivore
Distribution:
• Devonian of France (1 collection), the United Kingdom (1), United States (3: New York, Pennsylvania)
• Silurian of the United Kingdom (5), United States (3: New York, Pennsylvania)
Total: 13 collections including 15 occurrences