†unranked clade Xenopsaria Benson and Druckenmiller 2014 (plesiosaur)
Full reference: R. B. J. Benson and P. S. Druckenmiller. 2014. Faunal turnover of marine tetrapods during the Jurassic–Cretaceous transition. Biological Reviews 89(1):1-23
Parent taxon: Cryptoclidia according to R. B. J. Benson and P. S. Druckenmiller 2014
See also Serratos et al. 2017
Sister taxa: Cryptoclididae, Tricleidia
Subtaxa: Elasmosauridae Leptocleidia
Ecology: aquatic carnivore