Pachycostasaurus
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Domain: Eukaryota • Regnum: Animalia • Phylum: Chordata • Subphylum: Vertebrata • Infraphylum: Gnathostomata • Superclassis: Tetrapoda • Cladus: Amniota • Cladus: Reptilia • Ordo: Plesiosauria • Subordo: Pliosauroidea • Familia: Pliosauridae • Genus: Pachycostasaurus Cruickshank, 1996