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Vivaxosaurus
Taxonomy
Vivaxosaurus was named by Kalandadze and Kurkin (2000). Its type is Vivaxosaurus permirus.
It was synonymized subjectively with Fortunodon by Kurkin (2012).
It was assigned to Dicynodontidae by Kalandadze and Kurkin (2000) and Ivakhnenko (2003); to Dicynodontinae by Ivakhnenko (2008); and to Dicynodontoidea by Kammerer and Angielczyk (2009) and Kammerer et al. (2011).
It was synonymized subjectively with Fortunodon by Kurkin (2012).
It was assigned to Dicynodontidae by Kalandadze and Kurkin (2000) and Ivakhnenko (2003); to Dicynodontinae by Ivakhnenko (2008); and to Dicynodontoidea by Kammerer and Angielczyk (2009) and Kammerer et al. (2011).
Synonymy list
| Year | Name and author |
|---|---|
| 2000 | Vivaxosaurus Kalandadze and Kurkin |
| 2003 | Vivaxosaurus Ivakhnenko |
| 2008 | Vivaxosaurus Ivakhnenko |
| 2009 | Vivaxosaurus Kammerer and Angielczyk |
| 2011 | Vivaxosaurus Kammerer et al. p. 138 |
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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.
G. †Vivaxosaurus Kalandadze and Kurkin 2000
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†Vivaxosaurus trautscholdi Amalitzky 1922
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Invalid names: Gordonia annae Amalitzky 1922 [synonym], Gordonia rossica Amalitzky 1922 [synonym], Oudenodon venyukovi Amalitzky 1922 [synonym], Vivaxosaurus permirus Kalandadze and Kurkin 2000 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| N. N. Kalandadze and A. A. Kurkin 2000 | 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. |