Eryonidae
Introduction '''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, 1817*''Knebelia'' Van Straelen, 1922*''Rosenfeldia'' Garassino, Teruzzi & Dalla Vecchia, 1996
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