Large Ammonite – Perisphinctes sp. – Jurassic, Madagascar A beautifully preserved ammonite of the genus Perisphinctes, still partially embedded in its original septarian matrix. This specimen displays excellent quality, with sharply defined ribbing and a strong three-dimensional relief that emphasizes the elegant coiled structure of these Jurassic cephalopods. The natural contrast between the fossil and its matrix enhances its visual impact, making it not only a scientifically relevant specimen but also an attractive display piece. A fine collector’s item from Madagascar, representing one of the most characteristic ammonites of the Jurassic seas.