†Sphenosaurus Meyer 1847 (diapsid)
Parent taxon: Sauropterygia according to R. Owen 1861
Sister taxa: Cercidopleura, Dicranopleura, Doliovertebra, Eosauropterygia, Lariosauridae, Nothosauria, Nothosauriformes, Pistosauria, Placodontiformes
Subtaxa: none
Ecology: