Ercaia is genus of Cambrian arthropod known for being a member of the Chengjiang biota, containing the single species E. minuscula. It has been suggested to be one of the oldest crustaceans ever found. See also Arthropod Cambrian explosion Chengjiang biota List of Chengjiang Biota species by phylum References Cambrian animals Maotianshan shales fossils Prehistoric arthropod genera Cambrian genus extinctions