Genus
Valid Extinct

Ahvaytum

Lovelace et al. 2025

Ahvaytum is an extinct genus of probable basal sauropodomorph saurischian dinosaurs from the Late Triassic Popo Agie Formation of Wyoming, United States. The genus contains a single species, A. bahndooiveche, known from fragmentary hindlimb bones. Ahvaytum represents the oldest known named dinosaur of the ancient Laurasian landmass.

Temporal range
Triassic
Jurassic
Cretaceous
Paleogene
Neogene
252 201 145 66 0 Ma
PBDB occurrences
1
Group
Dinosaures
Terrestrial
Ahvaytum
click to enlarge
Ahvaytum is a saturnaliid sauropodomorph from the Late Triassic of what is now Wyoming. It is the oldest known dinosaur from the northern continent of Laurasia, challenging previous hypotheses of dinosaur origins and dispersal. Typical of basal dinosaurs from the Triassic, Ahvaytum was a small slender biped, reaching about 1 m in body length. © TotalDino · CC BY 4.0 · Wikimedia
Ahvaytum
Ahvaytum
Ahvaytum
PBDB ↗ Wikipedia ↗
Classification
Dinosauria Unranked clade
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Saurischia Unranked clade
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Sauropodomorpha Unranked clade
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Ahvaytum Genus
Fossil sites 1 geolocated sites
Distribution
Top countries
🇺🇸 United States
1
Geological formations
Popo Agie
1
Temporal distribution
Carnian (237–227.3 Ma)
1
Species (1)
Ahvaytum bahndooiveche 237 Ma
Images 5
Bibliography
Original description
D. M. Lovelace, A. M. Kufner, and A. J. Fitch, K. Curry Rogers, M. Schmitz, D. M. Schwartz, A. LeClair-Diaz, L. StClair, J. Mann, R. Teran. 2025. Rethinking dinosaur origins: oldest known equatorial dinosaur-bearing assemblage (mid-late Carnian Popo Agie FM, Wyoming, USA). Zoological Journal of the Linnean Society 203:zlae153 DOI ↗
Bibliography (1)
D. M. Lovelace, A. M. Kufner, and A. J. Fitch, K. Curry Rogers, M. Schmitz, D. M. Schwartz, A. LeClair-Diaz, L. StClair, J. Mann, R. Teran. 2025. Rethinking dinosaur origins: oldest known equatorial dinosaur-bearing assemblage (mid-late Carnian Popo Agie FM, Wyoming, USA). Zoological Journal of the Linnean Society 203:zlae153 DOI ↗