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Styxosaurus
Taxonomy
Styxosaurus was named by Welles (1943) [Sepkoski's age data: K Sn]. Its type is Styxosaurus snowii.
It was assigned to Alzadasaurinae by Welles (1962); to Plesiosauria by Sepkoski (2002); to Elasmosauridae by Welles (1943), Welles (1949), Carroll (1988), Carpenter (1999), O'Keefe (2001), Ketchum and Benson (2010), Otero et al. (2012); to Styxosaurinae by Otero (2016); and to Elasmosaurinae by O'Gorman (2019).
It was assigned to Alzadasaurinae by Welles (1962); to Plesiosauria by Sepkoski (2002); to Elasmosauridae by Welles (1943), Welles (1949), Carroll (1988), Carpenter (1999), O'Keefe (2001), Ketchum and Benson (2010), Otero et al. (2012); to Styxosaurinae by Otero (2016); and to Elasmosaurinae by O'Gorman (2019).
Species