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Lagerpetidae
Taxonomy
Lagerpetonidae was named by Arcucci (1986). Its type is Lagerpeton. It was considered monophyletic by Nesbitt (2011).
It was corrected as Lagerpetidae by Nesbitt (2011) and Martz and Small (2019); it was reranked as the unranked clade Lagerpetidae by Müller et al. (2023).
It was assigned to Pseudosuchia by Arcucci (1986); to Lagosuchia by Paul (1988) and Olshevsky (1991); to Dinosauromorpha by Nesbitt et al. (2009), Nesbitt (2011) and Martz and Small (2019); and to Pterosauromorpha by Müller et al. (2023).
It was corrected as Lagerpetidae by Nesbitt (2011) and Martz and Small (2019); it was reranked as the unranked clade Lagerpetidae by Müller et al. (2023).
It was assigned to Pseudosuchia by Arcucci (1986); to Lagosuchia by Paul (1988) and Olshevsky (1991); to Dinosauromorpha by Nesbitt et al. (2009), Nesbitt (2011) and Martz and Small (2019); and to Pterosauromorpha by Müller et al. (2023).
Subtaxa
Dromomeron, Faxinalipterus, Ixalerpeton, Kongonaphon, Lagerpeton (type genus), Scleromochlus, Venetoraptor
Synonymy list
| Year | Name and author |
|---|---|
| 1986 | Lagerpetonidae Arcucci |
| 1988 | Lagerpetonidae Paul p. 243 |
| 1991 | Lagerpetonidae Olshevsky p. 103 |
| 2009 | Lagerpetidae Nesbitt et al. p. 499 |
| 2011 | Lagerpetidae Nesbitt p. 208 fig. 52 |
| 2019 | Lagerpetidae Martz and Small p. 7 |
| 2023 | Lagerpetidae Müller et al. |
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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.
Unr. †Lagerpetidae Arcucci 1986
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G. †Dromomeron Irmis et al. 2007
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†Dromomeron gigas Martínez et al. 2016
†Dromomeron gregorii Nesbitt et al. 2009
†Dromomeron romeri Irmis et al. 2007
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. B. Arcucci 1986 | Reptiles 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. 2009 | Differentiated 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 2011 | All 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. |