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†Plesiosauria (Order) - plesiosaurs ..†Aptychodon (Genus) ..†Brimosaurus (Genus) ..†Discosaurus (Genus) ..†Nichollsia (Genus) ..†Opallionectes (Genus) ..†Piptomerus (Genus) ..†Piratosaurus (Genus) ..†Plesiosauroidea (Suborder) ..†Pliosauroidea (Suborder) ..[†Pliosauroidea] (Superfamily) ..[†Stereosaurus] (Genus) ..†Sthenarosaurus (Genus) ..[†Turneria] (Genus) ..[†Plesiosauroidea] (Superfamily)

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Last updated: 28 Aug 2026