Eurypterida - Adelophthalmidae
Parent taxon: Adelophthalmoidea according to J. C. Lamsdell 2025
See also Brauckmann et al. 2003, Dunlop et al. 2013, Dunlop et al. 2020, Lamsdell et al. 2013 and Tetlie and Dunlop 2005
Sister taxa: Nanahughmilleriidae, Parahughmilleriidae, Pittsfordipteridae
Subtaxa: Adelophthalmus Selkiepterella Unionopterus Weidopterus
Type: Adelophthalmus
Ecology: nektobenthic carnivore
Distribution:
• Permian of United States (3: Kansas, Oklahoma, Pennsylvania collections)
• Carboniferous to Permian of China (1)
• Carboniferous of Belgium (6), Canada (2: New Brunswick, Nova Scotia), Czechia (3), France (3), Germany (3), Italy (1), Kazakhstan (1), the Netherlands (2), Portugal (1), the Russian Federation (2), Spain (2), Ukraine (2), the United Kingdom (5), United States (8: Illinois, Kansas, Nebraska, New Mexico, Pennsylvania)
• Devonian of Australia (1), Belgium (1), Germany (2), the Russian Federation (1), United States (2: Pennsylvania, Pennsylvania )
Total: 52 collections including 53 occurrences