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Plesiosauria fam., gen. et sp. indet., Plesiosaur(s)

order Plesiosauria de Blainville, 1835

• Extinct species: Late Triassic - Late Cretaceous (203.6 - 66.0 Ma)

• Classification
• kingdom Animalia, phylum Chordata, class Reptilia

• Distribution
• Jurassic: Nagano
• Cretaceous: Iwate, Fukushima

• Subtaxa
• Futabasaurus suzukii
• Polycotylus, genus