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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|N. N. Kalandadze and A. A. Kurkin 2000 (Vivaxosaurus)||Medium-sized dicynodont, skull 40 cm long. Upper jaw lacking teeth, except for two large canine alveoli. Canines oriented anteroventrally. Preparietal short, round, strongly deepened, and reaching level of postorbital arch. Parietal region short and narrower than interorbital region. Parietals deepened to form well-pronounced parietal groove. Postorbitals forming dorsolateral part of temporal fossa and not overlapping parietals dorsally. Postfrontals with processes reaching parietals at level of posterior margin of parietals foramen. Palatines lacking contact with premaxilla, being separated by narrow flanges of maxillae. Ectopterygoid absent as individual element. Palatal surface of premaxilla positioned at angle of 140-150° to basicranial plane of skull. Posteriorly, quadratic rami of pterygoids widely divergent. Occiput moderately broad; occipital plane deepened and inclined slightly posteriorly. Basioccipital lacking intertuberal ridge. Occipital flange of squamosal with curvature in central part.|