Cyclolobidae: Goniatitid Ammonoidea belonging to the Cycloloboidea with thickly discoidal to subglobular shells with a small but open umbilicus and ammonitic sutures with numerous lobes that have subparallel sides.
The Cyclolobidae is one of three families of the Superfamily Cyclolobaceae; an extinct group of ammonoid cephalopods from the Late Paleozoic
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