Pampadromaeus

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Pampadromaeus
Temporal range:
Ma
↓
Skeletal reconstruction showing known remains
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Clade: Saurischia
Clade: †Sauropodomorpha
Family: †Saturnaliidae
Genus: †Pampadromaeus
Cabreira et al. 2011
Species:
†P. barberenai
Binomial name
†Pampadromaeus barberenai
Cabreira et al. 2011

Pampadromaeus is an

southern Brazil.[1]

Discovery

Pampadromaeus is known only from the

faunal stage of the early Late Triassic, about 230–228 million years ago.[1] A U-Pb (uranium decay) dating found that the Santa Maria Formation dated around 233.23 million years ago, putting it 1.5 million years older than the Ischigualasto Formation, and making the two formations approximately equal as the earliest dinosaur localities.[2]

Description

Life restoration

Pampadromaeus was a small bipedal animal. It shows a mosaic of basal and derived traits. It differs from other sauropodomorphs by a combination of characters. Some of these are shared with members of the Theropoda: the premaxilla is pointed downwards forming a subnarial gap with the maxilla and the anterior-most teeth are unserrated; in the location where with theropods the fenestra promaxillaris is positioned, a small depression is present. Basal traits consist of a large skull, a short thighbone, the possession of just two sacral vertebrae and the presence of fifteen teeth in the pterygoid.[1]

There were four teeth in the premaxilla and about twenty in both the maxilla and the lower jaw for a total of eighty-eight. The teeth were large, elongated, lanceolate, slightly recurved, sharply pointed and coarsely serrated. The lower leg was much longer than the thighbone, indicating a cursorial lifestyle.[1]

In 2022, Aureliano and colleagues performed a mirco-computed tomography scan on the postcranial skeletons of some of the earliest saurischian dinosaurs that lived during the late

sauropodomorphs) are not homologous, but are traits that independently evolved at least 3 times.[3]

Etymology

Pampadromaeus was first named by Sergio F. Cabreira, Cesar L. Schultz, Jonathas S. Bittencourt, Marina B. Soares, Daniel C. Fortier, Lúcio R. Silva and Max C. Langer in

paleontologist Mário Costa Barberena.[1]

Phylogeny

Pampadromaeus was found to be a

cladistic analyses. The describers emphasized however, that this position was not strongly supported, showing the difficulties of determining the affinities of such early forms with the basal Dinosauromorpha, Saurischia, Sauropodomorpha and Theropoda.[1]

References
  1. ^ a b c d e f Cabreira et al., 2011
  2. ^ Langer et al., 2018
  3. PMID 36494410
    .

Bibliography
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