Ammoniidid (Ammonitida) olid vana- ja keskaegkonna meredes elutsenud spiraalse kojaga peajalgsed limused.
Viimased ammoniidid surid välja umbes 65 miljonit aastat tagasi. Antarktisest leitud ammoniitide kivistised tõestavad, et kunagi olid sealsed mered palju soojemad.
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