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Polyptychoceras sp.

genus Polyptychoceras Yabe, 1927

• Extinct species: Late Cretaceous, Coniacian - Maastrichtian (89.3 - 70.6 Ma)
• Habitat: Marine

• Classification
• kingdom Animalia, phylum Mollusca, class Cephalopoda, subclass Ammonoidea, order Ammonitida, family Diplomoceratidae

• Distribution
• Cretaceous: Hokkaido, Fukushima, Tokyo

• Subtaxa
• P. haradanum
• P. (Polyptychoceras), subgenus
• P. subquadratum