Stenoscelida
Genus of proterochampsid archosauriforms From Wikipedia, the free encyclopedia
Stenoscelida (meaning "narrow hind leg") is a genus of proterochampsid archosauriforms from the Late Triassic Santa Maria Supersequence (Paraná Basin) of Rio Grande do Sul, Brazil. The genus contains a single species, S. aurantiacus, known from a right hind limb.[1]
| Stenoscelida Temporal range: Late Triassic | |
|---|---|
| |
| Speculative life restoration | |
| Scientific classification | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Clade: | Archosauromorpha |
| Clade: | Archosauriformes |
| Clade: | †Proterochampsia |
| Genus: | †Stenoscelida Müller, Garcia & Fonseca, 2022 |
| Species: | †S. aurantiacus |
| Binomial name | |
| †Stenoscelida aurantiacus Müller, Garcia & Fonseca, 2022 | |
Discovery and naming
Stenoscelida type locality in Rio Grande do Sul, Brazil
The holotype specimen, CAPPA/UFSM 0293, was found at the Exaeretodon sub-Assemblage Zone (Hyperodapedon Assemblage Zone) of the Santa Maria Supersequence (lower Candelaria Sequence) in the Paraná Basin. This locality is dated to the late Carnian/early Norian ages of the upper Triassic period, around 228 million years old. It consists of a complete, articulated right hind limb.[1]
In 2022, Stenoscelida aurantiacus was described as a new genus and species of proterochampsid archosauriforms by Rodrigo T. Müller, Mauricio S. Garcia, and André O. Fonseca based on these remains. The generic name, "Stenoscelida ", is derived from the Greek words "στενός", meaning "narrow", and "σκέλος" meaning "hind leg", in reference to the morphology of the holotype remains. The specific name, "aurantiacus", means "orange" in Latin, in reference to the color of the sediments of the type locality.[1]
Description
Based on the known fossil remains, Stenoscelida would have been smaller than the related Pseudochampsa and Proterochampsa from Argentina.[1]
Classification
Summarize
Perspective
In their phylogenetic analyses, Müller, Garcia & Fonseca (2022) recovered Stenoscelida as a member of the Proterochampsidae clade within Proterochampsia, in a polytomy with Tropidosuchus, Cerritosaurus, Gualosuchus, and Proterochampsa spp.[1] In an updated analysis, Müller (2025) recovered greater resolution within Proterochampsia. He recovered Stenosclida immediately outside of the Proterochampsidae, as the sister taxon to this clade. These results are displayed in the cladogram below:[2]
| ||||||||||||||||||||||||||||||||||||||||
References
Wikiwand - on
Seamless Wikipedia browsing. On steroids.