Eryonidae is a family of fossil decapod crustaceans which lived from the Upper Triassic to the Lower Cretaceous.[1] It contains four genera:[2] 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.[3]


  1. ^ 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). 
  2. ^ 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. 
  3. ^ 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. 
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