Ammonoidea

plural noun

Am·mo·noi·dea | \ ˌaməˈnȯidēə \

Definition of Ammonoidea

: an order of extinct chiefly Mesozoic Tetrabranchia comprising cephalopods having an external chambered shell that is either straight or variously curved or coiled — see ammonite entry 1

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The first known use of Ammonoidea was in 1884

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