Parent taxon: Polychelida according to R. M. Feldmann et al. 2013
See also Karasawa et al. 2013, Schweitzer and Feldmann 2001 and Schweitzer et al. 2010
Sister taxa: Adamanteryon, Eopolycheles, Tonneleryon
Subtaxa: Coleiidae Eryonidae Palaeopentachelidae Polychelidae Tetrachelidae
Type: Eryon
Ecology: semi-infaunal carnivore
Distribution:
• Miocene of the Dominican Republic (1 collection)
• Oligocene of United States (1: Washington)
• Eocene of United States (1: Washington)
• Cretaceous of Switzerland (1)
• Jurassic of Antarctica (2), Canada (1: British Columbia), France (5), Germany (8), Italy (3), Switzerland (1), the United Kingdom (16)
• Triassic of Austria (2), Italy (10), Japan (1), the United Kingdom (3)
Total: 56 collections including 95 occurrences