Albright, Gillette & Titus 2007. Plesiosaurs from the Upper Cretaceous (Cenomanian-Turonian) Tropic Shale of southern Utah, Part 2: Polycotylidae; replacement names for the preoccupied genus Palmula and the subfamily Palmulainae. Journal of Vertebrate Paleontology, 27(4), December 12 2007: 1051