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Collignociceras is a strongly ribbed and tuberculate, evolute ammonite from the Upper Cretaceous of the western U.S.
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Ammonites néocrétacées du Menabe (Madagascar). IV. Les Phylloceratidae. V. Les Gaudryceratidae. VI. Les Tetragonitidae 0 out of 5 stars based on 0 ratings.