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Chirotherium ischigualastianum

Reptilia - Chirotheriidae

Taxonomy
Rigalites ischigualastianus was named by Huene (1931). It is considered to be a form taxon. Its type specimen is PVL 2610 (plastotype), a footprint, and it is a trace fossil. Its type locality is Mina de Los Rastros tracksite, which is in a Ladinian fluvial-deltaic sandstone/limestone in the Los Rastros Formation of Argentina. It is the type species of Rigalites.

It was corrected as Rigalites ischigualastensis by Thulborn (1990) and Melchor and de Valais (2006); it was recombined as Chirotherium ischigualastianum by Klein and Lucas (2021).

Synonymy list
YearName and author
1931Rigalites ischigualastianus Huene p. 112
1939Rigalites ischigualastensis Fossa-Mancini p. 40
1948Rigalites ischigualastianus Frenguelli p. 188
1958Rigalites ischigualastianus Kuhn p. 23
1963Rigalites ischigualastianus Kuhn p. 91
1971Rigalites ischigualastianus Haubold p. 63
1981Rigalites ischigualastianus Leonardi p. 930
1990Rigalites ischigualastensis Thulborn p. 203
1994Rigalites ischigualastianus Leonardi p. 20
2006Rigalites ischigualastensis Melchor and de Valais p. 368
2021Chirotherium ischigualastianum Klein and Lucas p. 29–30

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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()
RankNameAuthor
—Amniota
—Sauropsida
classReptilia
subclassEureptilia()
—Romeriida
—Diapsida()
—Archosauromorpha(Huene 1946)
—Crocopoda
—ArchosauriformesGauthier 1986
—Eucrocopoda
—Archosauria()
—Pseudosuchia(Zittel 1890)
familyChirotheriidaeAbel 1935
genusChirotheriumKaup 1835
speciesischigualastianum()

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.

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Diagnosis
ReferenceDiagnosis
H. Klein and S. G. Lucas 2021Narrow trackway of a quadruped with relatively long stride length (Stride:pes length = 6 :1 up to 8:1), with a pace angulation of more than 160° and in which the manus can be proximally overstepped by the pes. Pes imprints parallel or slightly directed outward relative to the midline, manus imprints more strongly directed outward with digit V often directed backward. Pes tetradactyl to pentadactyl and functionally tridactyl with digit III being longest, digit I being reduced, thin and posteriorly shifted relative to II–IV, and digit V preserved as a circular to oval pad lacking a phalangeal portion. Digits I–IV with robust, elongate, triangular and pointed claws. Manus smaller and pentadactyl, occasionally lacking impressions of digits I and V, with pointed claws on digits I–IV.
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: terrestrialsubc
Locomotion: actively mobilec
Diet: carnivoresubo
Created: 2009-01-03 20:38:45
Modified: 2009-01-03 22:38:45
Source: subo = suborder, subc = subclass, c = class, subp = subphylum
References: Benton 1983, Carroll 1988, Hendy et al. 2009

Age range: Ladinian or 242.00000 to 237.00000 Ma

Collections: one only


Time interval Ma Country or state Original ID and collection number
Ladinian242.0 - 237.0Argentina (San Juan) Rigalites ischigualastensis (type locality: 74751)