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Lagerpetonidae

Reptilia - Lagerpetonidae

Taxonomy
Lagerpetonidae was named by Arcucci (1986). It was considered monophyletic by Nesbitt (2011).

It was corrected as Lagerpetidae by Nesbitt (2011).

It was assigned to Pseudosuchia by Arcucci (1986); to Lagosuchia by Paul (1988) and Olshevsky (1991); and to Dinosauromorpha by Nesbitt et al. (2009) and Nesbitt (2011).

Synonymy list
YearName and author
1986Lagerpetonidae Arcucci
1988Lagerpetonidae Paul p. 243
1991Lagerpetonidae Olshevsky p. 103
2009Lagerpetidae Nesbitt et al. p. 499
2011Lagerpetidae Nesbitt p. 208 fig. 52

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
Sauropsida
RankNameAuthor
classReptilia
subclassEureptilia()
Romeriida
Diapsida()
Eosuchia()
Neodiapsida
SauriaGauthier 1984
Archosauromorpha(Huene 1946)
Crocopoda
ArchosauriformesGauthier 1986
Eucrocopoda
Archosauria()
informalAvemetatarsalia
Ornithodira
Dinosauromorpha
familyLagerpetonidae
familyLagerpetonidae

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
A. B. Arcucci 1986Reptiles of small size (one hind limb 25 cm in length), with very marked locomotor
specializations. Last presacral vertebrae with anteriorly-oriented neural spines. Sacrum with two vertebrae, with the last presacral in the process of sacralization. Closed acetabulum, vertical ilium with well-defined preacetabular projection; pubis short and wide; ischium longer than pubis and with an extensive ventral lamina. Hollow femur shorter than tibia, as in Lagosuchus. Tibia transversely extended in its distal region, with the ventral process on the anterior border, differing from other thecodonts. Advanced mesotarsal tarsus, similar to Lagosuchus and Trialestes, but with a more developed ascending process of the astragalus and barely distinguishable calcaneal tubercle. Two distal tarsals that could be fused. Elongate metatarsals. Metatarsal IV longer than the others. Metatarsal I short and V very reduced and lacking phalanges. (Translated by M. Carrano.)
S. J. Nesbitt et al. 2009Differentiated from all other archosaurs by the following unambiguous synapomorphies: 1) presence of a hook-shaped femoral head, 2) a lateral emargination ventral to the femoral head, 3) an enlarged posteromedial tuber of the proximal end of the femur, 4) an enlarged crista tibiofibularis of the distal end of the femur, 5) an anteromedial corner of the distal end of the femur that forms an angle near or less than 90°, and 6) an astragalus with a posteriorly situated ascending process.
S. J. Nesbitt 2011All taxa more closely related to Lagerpeton chanarensis Romer, 1971a, than to Alligator mississippiensis Daudin, 1801, Eudimorphodon ranzii Zambelli, 1973, Marasuchus lilloensis Sereno and Arcucci, 1994b, Silesaurus opolensis Dzik, 2003, Triceratops horridus Marsh, 1889, Saltasaurus loricatus Bonaparte and Powell, 1980, and Passer domesticus Linnaeus, 1758.