Parapuzosia bradyi

{{Short description|Extinct species of ammonite}}

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| fossil_range = {{fossil range|Late Cretaceous}}

| image = Parapuzosia bradyi (fossil ammonite) (Cody Shale, Upper Cretaceous; Wyoming, USA).jpg

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| genus = Parapuzosia

| species = bradyi

| authority = Miller & Youngquist, 1946

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Parapuzosia bradyi is a gigantic species of ammonite, reaching diameters of more than {{convert|4.5|ft|m|abbr=on}} by {{convert|6|ft|m|abbr=on}}. It is the largest species of ammonite in North America. It had a moderately involute shell with flat sides. The inner whorls are slightly oval-shaped with prominent ribbing. They are only known from the upper layers of the Eagle Sandstone and Cody Shale formations (both Late Cretaceous).{{cite book|author1=Neal L. Larson |author2=Steven D. Jorgensen |author3=Robert A. Farrar |author4=Peter L. Larson |name-list-style=amp |title =Ammonites and the Other Cephalopods of the Pierre Seaway|publisher =Geoscience Press, Inc|year =1997|page=44|isbn =0-945005-34-2}}