Eryonidae is a family of fossil decapod crustaceans which lived from the Upper Triassic to the Lower Cretaceous. It contains four genera: An aggregation of three unidentified eryonids was reported in 2012 inside a Late Jurassic ammonoid of the species Harpoceras falciferum; they represent the earliest evidence of gregarious behaviour in decapods.
- Cycleryon Glaessner, 1965
- Eryon A. G. Desmarest, 1822
- Knebelia Van Straelen, 1922
- Rosenfeldia Garassino, Teruzzi & Dalla Vecchia, 1996
- Hiroaki Karasawa, Fumio Takahashi, Eiji Doi & Hideo Ishida (2003). "First record of Coleia Broderip (Crustacea, Decapoda, Coleiidae) from the Upper Triassic of Japan". Contributions to Zoology 72 (2/3).
- Sammy De Grave, N. Dean Pentcheff, Shane T. Ahyong et al. (2009). "A classification of living and fossil genera of decapod crustaceans". Raffles Bulletin of Zoology. Suppl. 21: 1–109.
- Adiël A. Klompmaker & René H. B. Fraaije (2012). "Animal behavior frozen in time: gregarious behavior of Early Jurassic lobsters within an ammonoid body chamber". PLoS ONE 7 (3): e31893. doi:10.1371/journal.pone.0031893.