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Eucnemesaurus fortis

Reptilia -

Taxonomy
Eucnemesaurus fortis was named by Van Hoepen (1920). Its type specimen is TrM 119, a partial skeleton, and it is not a trace fossil. Its type locality is farm Zonderhout (291), Slabberts (zone A/5), which is in a Norian/Rhaetian terrestrial mudstone in the Elliot Formation of South Africa. It is the type species of Eucnemesaurus.

It was considered a nomen dubium by Galton and Upchurch (2004).

Synonyms
Synonymy list
YearName and author
1920Eucnemesaurus fortis Van Hoepen p. 93 figs. 1, 3-7, Pl. 11-13
1924Eucnemesaurus fortis Haughton
1940Eucnemesaurus fortis Huene p. 262
1941Eucnemesaurus fortis Huene p. 141
1954Eucnemesaurus fortis Haughton and Brink p. 37
1970Eucnemesaurus fortis Ellenberger p. 346
1970Eucnemesaurus fortis Steel p. 57
1985Aliwalia rex Galton
1988Aliwalia rex Paul p. 250
1990Aliwalia rex Sues p. 147
1998Aliwalia rex Galton and Van Heerden pp. 172-174
2004Aliwalia rex Langer p. 27
2005Eucnemesaurus fortis Yates pp. 274-275
2007Eucnemesaurus fortis Yates p. 96
2009Eucnemesaurus fortis Barrett p. 1032
2010Eucnemesaurus fortis Langer et al. p. 70
2015Eucnemesaurus fortis McPhee et al. p. 4
2016Eucnemesaurus fortis Peyre de Fabrègues and Allain p. 18

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
OlfactoresJefferies 1991
subphylumVertebrata
Gnathostomata()
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
Sauropsida
classReptilia
subclassEureptilia()
Romeriida
RankNameAuthor
Diapsida()
Eosuchia()
Neodiapsida
SauriaGauthier 1984
Archosauromorpha(Huene 1946)
Crocopoda
ArchosauriformesGauthier 1986
Eucrocopoda
Archosauria()
informalAvemetatarsalia
Ornithodira
Dinosauromorpha
Dinosauriformes
Dinosauria()
Saurischia()
Eusaurischia
Sauropodomorpha(Huene 1932)
Massopoda
Riojasauridae
genusEucnemesaurus
speciesfortis

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.

Diagnosis
ReferenceDiagnosis
B. W. McPhee et al. 2015E. entaxonis differs from E. fortis in the following features: (1) E. fortis presents a femur that is subcircular in cross-section rather than elliptical, and (2) the holotype of E. fortis (TM 119) displays a distal tibia in which the mediolaterally extensive posterior surface extends as far laterally as the anterior ascending process (for articulation with the astragalus). It is possible that the distal embayment present on the fourth trochanter in E. fortis is absent in E. entaxonis, but poor preservation in the latter taxon precludes confirmation of this. Furthermore, a dorsal neural arch of E. fortis possesses a unique accessory lamina within the centrodiapophyseal fossa—a feature that cannot be confirmed in the preserved material of E. entaxonis. This feature therefore remains a valid diagnostic character of E. fortis for the time being.