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Kwanasaurus

Reptilia

Taxonomy

Species
K. williamparkeri (type species)

Synonymy list
YearName and author
2019Kwanasaurus Martz and Small p. 17

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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
RankNameAuthor
Sauropsida
classReptilia
subclassEureptilia()
Romeriida
Diapsida()
Archosauromorpha(Huene 1946)
Crocopoda
ArchosauriformesGauthier 1986
Eucrocopoda
Archosauria()
informalAvemetatarsalia
Ornithodira
Dinosauromorpha
Dinosauriformes
Silesauridae
Sulcimentisauria
genusKwanasaurus

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.

G. †Kwanasaurus Martz and Small 2019
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Kwanasaurus williamparkeri Martz and Small 2019
Diagnosis
ReferenceDiagnosis
J. W. Martz and B. J. Small 2019Kwanasaurus is distinguished from all other silesaurid taxa by the following autapomorphies: Main body and posterior process of maxilla extremely short and robust; ascending process of the maxilla extends at least half the anteroposterior length of the element; prominent posterolateral flange and complex jugal and lacrimal articulations on posterior end of posterior process of the maxilla; massive subtriangular, ventromedially oriented flange on medial surface of the maxilla; 12 maxillary teeth;
14 dentary teeth; ilium with elongate and blade-like preacetabular process that extends beyond the pubic peduncle; concave ventral acetabular margin of ilium; medial condyle at distal end of femur very thin compared to lateral condyle and crista tibiofibularis; depression on distal end of the femur anterior to the crista tibiofibularis.

Aside from autapomorphies, Kwanasaurus possesses the following combination of character states in relation to various silesaurid taxa: Kwanasaurus shares with Lewisuchus/Pseudolagosuchus a tooth row that extends to the posterior end of the maxilla and a fourth trochanter on the femur; Kwanasaurus differs from Lewisuchus/Pseudolagsuchus in having a steeply rising ascending process on the maxilla and in possessing broad and coarsely denticulate folidont teeth. Kwanasaurus shares with Asilisaurus a Meckelian groove that does not extend through the symphysis; Kwanasaurus differs from Asilisaurus in possessing a dentary with a ventrally positioned Meckelian groove, broad and coarsely denticulate folidont teeth, and a strongly “saddle-shaped” ilium. Kwanasaurus shares with the large Manda beds silesaurid an un-notched anterior trochanter. Kwanasaurus shares with Silesaurus a steeply rising ascending process of
the maxilla, a dentary with a ventrally positioned Meckelian groove, distinct torsion between the proximal and distal ends of the humerus, a strongly “saddle-shaped” ilium, and a fourth trochanter; Kwanasaurus differs from Silesaurus in having a tooth row
that extends to the posterior end of the maxilla, having a dentary with a pronounced lateral ridge, having a dentary with a Meckelian groove that does not extend through the symphysis, and in possessing broad and coarsely denticulate folidont teeth; Kwanasaurus shares with some individuals of Silesaurus an un-noched anterior trochanter and the absence of a trochanteric shelf. Kwanasaurus shares with Sacisaurus a dentary with a ventrally positioned Meckelian groove, broad and coarsely denticulate folidont teeth, and a fourth trochanter on the femur; Kwanasaurus differs from Sacisaurus in having a tooth row that extends to the posterior end of the maxilla, having a pronounced lateral ridge on the dentary, having an anterolateral groove on the dentary that extends to the anterior tip of the element, having a dentary with a Meckelian groove that does not extend through the symphysis, and in lacking a notch on the anterior trochanter of the femur. Kwanasaurus shares with Eucoelophysis a pronounced lateral ridge on the dentary,
a dentary with a ventrally positioned Meckelian groove, a Meckelian groove that does not extend through the symphysis, broad and coarsely denticulate folidont teeth, a strongly “saddle-shaped” ilium, and the absence of a trochanteric shelf; Kwanasaurus differs from Eucoelophysis in having a more robust dentary and a fourth trochanter. Kwanasaurus shares with Diodorus a pronounced lateral ridge on the dentary, a dentary with a ventrally positioned Meckelian groove, a Meckelian groove that does not extend through the dentary symphysis, broad and coarsely denticulate folidont teeth, the absence of a trochanteric shelf, and a fourth trochanter; Kwanasaurus differs from Diodorus in only possessing canting on the anteriormost dentary teeth, possessing distinct torsion between the proximal and distal ends of the humerus, and in lacking a notch on the anterior trochanter of the femur. Kwanansaurus differs from Ignotosaurus in possessing a strongly “saddle-shaped” ilium. Kwanasaurus shares with Lutungutali a fourth trochanter on the femur; Kwanasaurus differs from Lutungutali in possessing a strongly “saddle-shaped” ilium with an elongate and flattened preacetabular process. Kwanasaurus shares with Technosaurus a dentary with a ventrally positioned Meckelian groove, and broad and coarsely denticulate folidont teeth; Kwanasaurus differs from Technosaurus in possessing a distinct lateral ridge on the dentary. Kwanasaurus shares with Soumyasaurus a dentary with a ventrally positioned Meckelian groove; Kwanasaurus differs from Soumyasaurus in posessing a much more robust dentary, a pronounced lateral ridge on the dentary, and broad and coarsely denticulate folidont teeth.
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: base of the Norian to the top of the Rhaetian or 228.00000 to 201.30000 Ma

Collections (6 total)


Time interval Ma Country or state Original ID and collection number
Norian - Rhaetian228.0 - 201.3USA (Colorado) K. williamparkeri (92089 206266 206267 206268 206269 206270)