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Leyesaurus marayensis

Reptilia - Massospondylidae

Taxonomy
Leyesaurus marayensis was named by Apaldetti et al. (2011). Its type specimen is PVSJ 706, a partial skeleton (skull, cervical and caudal vertebrae, partial girdles and limbs), and it is a 3D body fossil. Its type locality is Balde de Leyes, which is in a Jurassic alluvial fan mudstone/siltstone in Argentina.

Synonymy list
YearName and author
2011Leyesaurus marayensis Apaldetti et al. p. 3–5 fig. 3–12
2015Leyesaurus marayensis Martínez et al. p. 380
2017Leyesaurus marayensis Díaz-Martínez et al. p. 918

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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
subclassEureptilia()
RankNameAuthor
—Romeriida
—Diapsida()
—Archosauromorpha(Huene 1946)
—Crocopoda
—ArchosauriformesGauthier 1986
—Eucrocopoda
—Archosauria()
informalAvemetatarsalia
—Ornithodira
—Dinosauromorpha
—Dinosauriformes
—Dinosauria()
—Saurischia()
—Eusaurischia
—Sauropodomorpha(Huene 1932)
—Massopoda
familyMassospondylidae
genusLeyesaurus
speciesmarayensis

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.

†Leyesaurus marayensis Apaldetti et al. 2011
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Diagnosis
ReferenceDiagnosis
C. Apaldetti et al. 2011A basal sauropodomorph diagnosed by the following autapomorphies and combination of characters (asterisks indicate autapomorphies): sharply acute angle (50u) formed by the ascending process of the maxilla with the alveolar margin*; straight ascending process of the maxilla with a longitudinal ridge on its lateral surface; noticeably bulging labial side of the maxillary teeth; greatly elongated cervical vertebra (length/height ratio of sixth cervical centrum more than 5*); neural arches of the cervical vertebrae with sinuous dorsal margin of the neural spines and short epipophyses—extending two-third of the length of the postzygapophyses—; and proximal articular surface of metatarsal III shelf-like and medially deflected*.
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: terrestrialsubc
Locomotion: actively mobilec
Created: 2017-04-17 15:16:03
Modified: 2017-04-17 15:16:03
Source: subc = subclass, c = class, subp = subphylum
References: Hendy et al. 2009, Carroll 1988

Age range: Early/Lower Jurassic or 201.40000 to 174.70000 Ma

Collections: one only


Time interval Ma Country or state Original ID and collection number
Early/Lower Jurassic201.4 - 174.7Argentina (San Juan) Plateosauridae indet. (type locality: 131450)