Genus
Valid Extinct

Lewisuchus

Romer 1972

Lewisuchus is a genus of archosaur that lived during the Late Triassic. As a silesaurid dinosauriform, it was a member of the group of reptiles most commonly considered to be the closest relatives of dinosaurs. Lewisuchus was about 1 metre (3.3 ft) long. Fossils have been found in the Chañares Formation of Argentina. It exhibited osteoderms along its back.

Temporal range
Triassic
Jurassic
Cretaceous
Paleogene
Neogene
252 201 145 66 0 Ma
PBDB occurrences
4
Group
Dinosaures
Herbivore Ground dwelling, gregarious Terrestrial
Lewisuchus
click to enlarge
Muestras de dinosaurios en tamaño real a cuando existieron. El gran tiranosaurio, que habito hace millones de años la zona de Bagua en Amazonas. El carnotaurus (carnívoro feroz), el velociraptor y el lewisuchus, pequeño antecesor de los dinosaurios. © Andrea Garay Alcantara · CC BY-SA 4.0 · Wikimedia
Lewisuchus
Lewisuchus
Lewisuchus
Lewisuchus
Lewisuchus
Lewisuchus
PBDB ↗ Wikipedia ↗
Classification
Dinosauria Unranked clade
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Ornithischia Unranked clade
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Parapredentata Unranked clade
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Silesauridae Unranked clade
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Lewisuchus Genus
Measurements
Length
1,4 m ⓘ
Lewisuchus admixtus
Mass
2,7 kg ⓘ
Lewisuchus admixtus
Fossil sites 4 geolocated sites
Distribution
Top countries
🇦🇷 Argentina
4
Geological formations
Chañares
4
Temporal distribution
Oxfordian (161.5–154.8 Ma)
1
Carnian (237–227.3 Ma)
1
Ladinian (241.464–237 Ma)
2
Species (2)
Lewisuchus admixtus 241 Ma
Pseudolagosuchus major subjective synonym of Lewisuchus admixtus 241 Ma
Synonyms (1)
Pseudolagosuchus subjective synonym of Lewisuchus
Images 6
Bibliography
Original description
A. S. Romer. 1972. The Chañares (Argentina) Triassic reptile fauna; XIV, Lewisuchus admixtus, gen. et sp. nov., a further thecodont from the Chañares beds. Breviora 390:1-13
Bibliography (4)
M. D. Ezcurra, S. J. Nesbitt, and L. E. Fiorelli, J. B. Desojo. 2020. New specimen sheds light on the anatomy and taxonomy of the early Late Triassic dinosauriforms from the Chañares Formation, NW Argentina. The Anatomical Record 303(5):1393-1438 DOI ↗
R. R. Rogers, A. B. Arcucci, and F. Abdala, P. C. Sereno, C. A. Forster, C. L. May. 2001. Paleoenvironment and taphonomy of the Chanares Formation tetrapod assemblage (Middle Triassic), northwestern Argentina: spectacular preservation in volcanogenic concretions. Palaios 16:461-481 DOI ↗
A. B. Arcucci. 1987. Un nuevo Lagosuchidae (Thecodontia-Pseudosuchia) de la fauna de Los Chañares (Edad Reptil Chañarense, Triasico Medio), La Rioja, Argentina [A new Lagosuchidae (Thecodontia-Pseudosuchia) from Los Chañares fauna (Chanarian Reptile Age, Middle Triassic), La Rioja Province, Argentina]. Ameghiniana 24(1-2):89-94
A. S. Romer. 1972. The Chañares (Argentina) Triassic reptile fauna; XIV, Lewisuchus admixtus, gen. et sp. nov., a further thecodont from the Chañares beds. Breviora 390:1-13