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Volgatitan simbirskiensis

Osteichthyes

Taxonomy
Volgatitan simbirskiensis was named by Averianov and Efimov (2018). Its type specimen is UPM 976/1−7, a set of vertebrae (7 caudal vertebrae), and it is a 3D body fossil. Its type locality is Slantsevy Rudnik, Ulyanovsk, which is in a Hauterivian marine claystone in the Russian Federation.

Synonymy list
YearName and author
2018Volgatitan simbirskiensis Averianov and Efimov p. 146
2021Volgatitan simbirskiensis Gallina et al. p. 35

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
classOsteichthyes
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
—Sauropsida
classReptilia
subclassEureptilia()
—Romeriida
—Diapsida()
—Archosauromorpha(Huene 1946)
—Crocopoda
RankNameAuthor
—ArchosauriformesGauthier 1986
—Eucrocopoda
—Archosauria()
informalAvemetatarsalia
—Ornithodira
—Dinosauromorpha
—Dinosauriformes
—Dinosauria()
—Saurischia()
—Sauropodomorpha(Huene 1932)
—Massopoda
—Sauropodiformes
—Sauropoda()
—Gravisauria
—Eusauropoda
—Neosauropoda
—Macronaria
—Titanosauriformes
—Somphospondyli
—Titanosauria
—Lithostrotia
genusVolgatitan
speciessimbirskiensis

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.

†Volgatitan simbirskiensis Averianov and Efimov 2018
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Diagnosis
ReferenceDiagnosis
A. Averianov and V. Efimov 2018Referred to Titanosauriformes based on the neural arch of anterior and middle caudal vertebrae positioned at the anterior half of the centrum. Referred to Titanosauria based on the procoelous anterior and middle caudal vertebrae with strongly convex condyle, somphospondylous (camellate) bone texture of caudal vertebrae, and hyposphenal ridge absent. Referred to the Lithostrotia based on a distinct rim ringing the condyle in middle caudal vertebrae. Among lithostrotians (sensu González Riga et al., 2108) it differs from Malawisaurus, Tengrisaurus, Rapetosaurus, Aeolosaurus and Saltasauridae by a ventral ridge instead of a ventral groove in anterior and middle caudal vertebrae, from Malawisaurus and Saltasauridae ― by the lack of ventrolateral ridges in anterior and middle caudal vertebrae, from Epachthosaurus and more derived lithostrotians ― by the lack of tubercle on the dorsal surface of the transverse process in the first caudal vertebra. It differs from all sauropods except Astrophocaudia and Epachthosaurus by hyposphene-hypantrum articulations in anterior caudal vertebrae.