ammonitoidea definition

  • noun-plural:
    • An extensive number of fossil cephalopods usually very rich in Mesozoic stones. See ammonite.
  • others:
    • A superfamily of tetrabranchiate cephalopods, including those which have an external layer of two principal layers, with a short smooth chamber together with siphonal cavity extending forward. It includes the majority of the order Ammonea.

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