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Archaeocidaridae
Archaeocidaridae, a family of Palaeozoic Sea Urchins, of which Archaeocidaris is the type; it occurs in the Carboniferous (q.v.) and Permian systems (q.v.).
Archaeocidaridae, a family of Palaeozoic Sea Urchins, of which Archaeocidaris is the type; it occurs in the Carboniferous (q.v.) and Permian systems (q.v.).