†unranked clade Merriamosauria Motani 1999 (ichthyosaur)
Full reference: R. Motani. 1999. Phylogeny of the Ichthyopterygia. Journal of Vertebrate Paleontology 19(3):473-496
Parent taxon: Longipinnati according to M. W. Maisch 2010
Sister taxa: Cymbospondylidae, Toretocnemidae
Subtaxa: Californosauridae, Euichthyosauria, Guanlingsauridae, Merriamosauridae, Parvipelvia, Shastasauria, Shastasauridae, Shonisauridae, Thalattoarchon
Ecology: nektonic carnivore