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Grammoceras sp.

genus Grammoceras Hyatt, 1867

• Extinct species: Toarcian, Early Jurassic - Aalenian, Middle Jurassic (175.6 - 171.6 Ma)
• Habitat: Marine

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

• Distribution
• Jurassic: Toyama