†family Microcleididae Benson et al. 2012 (plesiosaur)
Full reference: R. B. J. Benson, M. Evans, and P. S. Druckenmiller. 2012. High diversity, low disparity and small body size in plesiosaurs (Reptilia, Sauropterygia) from the Triassic–Jurassic boundary. PLoS ONE 7(3):e31838
Parent taxon: Plesiosauroidea according to R. B. J. Benson and P. S. Druckenmiller 2013
Sister taxa: Cryptoclidia, Euplesiosauria, Opallionectes, Plesiopterys, Plesiosauridae, Plesiosaurus, Sthenarosaurus, Westphaliasaurus
Subtaxa: Microcleidus, Seeleyosaurus
Ecology: aquatic carnivore