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Riojasauridae

Reptilia

Taxonomy
Riojasauridae was named by Yates (2007). Its type is Riojasaurus. It was considered monophyletic by Yates (2007).

It was assigned to Plateosauria by Yates (2010); and to Massopoda by Yates (2007), Novas et al. (2011) and McPhee et al. (2015).

Synonymy list
YearName and author
2007Riojasauridae Yates p. 96
2010Riojasauridae Yates p. 750
2011Riojasauridae Novas et al. p. 341 fig. 4
2015Riojasauridae McPhee et al. p. 19 fig. 12

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
—Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
—Sauropsida
classReptilia
RankNameAuthor
subclassEureptilia()
—Romeriida
—Diapsida()
—Archosauromorpha(Huene 1946)
—Crocopoda
—ArchosauriformesGauthier 1986
—Eucrocopoda
—Archosauria()
informalAvemetatarsalia
—Ornithodira
—Dinosauromorpha
—Dinosauriformes
—Dinosauria()
—Saurischia()
—Eusaurischia
—Sauropodomorpha(Huene 1932)
—Massopoda
—Riojasauridae
—Riojasauridae

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.

Unr. †Riojasauridae Yates 2007
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G. †Eucnemesaurus Van Hoepen 1920
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†Eucnemesaurus entaxonis McPhee et al. 2015
†Eucnemesaurus fortis Van Hoepen 1920
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Invalid names: Aliwalia rex Galton 1985 [synonym]
Invalid names: Aliwalia Galton 1985 [synonym]
G. †Riojasaurus Bonaparte 1969
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†Riojasaurus incertus Bonaparte 1969
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Invalid names: Strenusaurus procerus Bonaparte 1969 [synonym]
Invalid names: Strenusaurus Bonaparte 1969 [synonym]
Diagnosis
ReferenceDiagnosis
A. M. Yates 2007Large, robust sauropodomorphs with the following synapomorphies: a tall, crest-like lesser trochanter that is higher than wide in cross-section; a large tubercle on the posterior side of the proximal femur (this is a reversal to a non-dinosaurian character-state); and a rounded, convex profile of the fourth trochanter (versus a subrectangular profile). The presence of a shallow embayment on the distal margin of the fourth trochanter (giving the trochanter a semi-pendant shape) might also diagnose this clade but the presence of this character in Massospondylidae renders its distribution ambiguous.
Measurements
No measurements are available
Composition: phosphaticsubp
Maximum body mass: 3000 kgg
Minimum body mass: 1000 kgg
Environment: terrestrialsubc
Locomotion: actively mobilec
Created: 2017-04-17 15:16:03
Modified: 2017-04-17 15:16:03
Source: g = genus, subc = subclass, c = class, subp = subphylum
References: Hendy et al. 2009, Carroll 1988, Peczkis 1995

Age range: Norian or 228.00000 to 208.50000 Ma

Collections (6 total)


Time interval Ma Country or state Original ID and collection number
Norian228.0 - 208.5Argentina (La Rioja) Riojasaurus incertus (52032 58569)
Norian - Rhaetian228.0 - 201.3South Africa (Eastern Cape) Aliwalia rex (36610) Eucnemesaurus entaxonis (172834)
Norian - Rhaetian228.0 - 201.3South Africa (Free State) Eucnemesaurus fortis (36733 107176)