Reptilia - Plesiosauria - Polycotylidae
Full reference: L. B. Albright, D. D. Gillette, and A. L. Titus. 2007. Plesiosaurs from the Upper Cretaceous (Cenomanian-Turonian) Tropic Shale of southern Utah, part 2: Polycotylidae. Journal of Vertebrate Paleontology 27(1):41-58
Parent taxon: Polycotylidae according to R. O. Clark et al. 2024
See also Albright et al. 2007
Sister taxa: Ceraunosaurus, Cimoliasaurus leucoscopelus, Edgarosaurus, Manemergus, Mauriciosaurus, Pahasapasaurus, Palmulainae, Palmulasaurinae, Plesiopleurodon, Polycotyilnae, Sulcusuchus, Thililua, Polycotylus brevispondylus, Polycotylus ichthyospondylus tanais
Subtaxa: Dolichorhynchia Eopolycotylus Georgiasaurus Polycotylus Scalamagnus Serpentisuchops Trinacromerum
Ecology: aquatic carnivore
Distribution:
• Cretaceous of Canada (6: Manitoba, Northwest Territories, Saskatchewan collections), Poland (2), the Russian Federation (3), United States (40: Alabama, Kansas, South Dakota, Texas, Utah, Wyoming)
• Jurassic of France (1)
Total: 52 collections each including a single occurrence