Amanasaurus

Amanasaurus
Temporal range: Late Triassic (Carnian), ~233.23 Ma
Skeletal reconstruction showing known fossil material
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Dinosauria (?)
Clade: †Ornithischia (?)
Family: †Silesauridae
Genus: †Amanasaurus
Müller & Garcia, 2024
Species:
†A. nesbitti
Binomial name
†Amanasaurus nesbitti
Müller & Garcia, 2024

Amanasaurus (meaning "rain lizard") is a genus of silesaurid dinosauriforms from the Late Triassic Santa Maria Supersequence of Rio Grande do Sul, Brazil. The genus contains a single species, A. nesbitti, known from two partial femora.

Discovery and naming

Amanasaurus is located in Brazil
Amanasaurus
Amanasaurus type locality in Rio Grande do Sul, Brazil
Amanasaurus holotype (a–e) and referred specimen (f–i)

The Amanasaurus holotype specimen, CAPPA/UFSM 0374, was discovered in the Hyperodapedon Assemblage Zone of the Santa Maria Supersequence (Candelária Sequence) of the Paraná Basin, dated to the late Carnian stage of the Late Triassic. It consists of a proximal right femur. CAPPA/UFSM 0375, a distal left femur belonging to a larger individual from the same locality, was also referred to Amanasaurus.[1]

In 2023, Müller & Garcia announced Amanasaurus nesbitti as a new genus and species of silesaurid based on these remains. The generic name, "Amanasaurus", combines the Tupi word "amana", meaning "rain", with the Greek "saurus", meaning "lizard", in reference to the Carnian pluvial episode. The specific name, "nesbitti", honors North American paleontologist Sterling J. Nesbitt.[1]

The original publication describing Amanasaurus nesbitti did not fulfill the requirements of the ICZN. As such, Müller & Garcia published a correction the following year, finalizing the taxon name.[2]

Classification

Müller & Garcia (2023) recovered Amanasaurus as the sister taxon to Ignotosaurus and Silesaurus. Similar to a number of recent studies, these taxa, along with other "traditional" silesaurids, are treated as a paraphyletic grade of ornithischians. The results of their phylogenetic analyses are shown in the cladogram below:[1]

Dinosauria


References

  1. ^ a b c Müller, R. T.; Garcia, M. S. (2023-04-11). "A new silesaurid from Carnian beds of Brazil fills a gap in the radiation of avian line archosaurs". Scientific Reports. 13. 4981. doi:10.1038/s41598-023-32057-x. PMC 10090097.
  2. ^ Müller, Rodrigo T.; Garcia, Maurício S. (2024-08-22). "Author Correction: A new silesaurid from Carnian beds of Brazil fills a gap in the radiation of avian line archosaurs". Scientific Reports. 14 (1). doi:10.1038/s41598-024-70440-4. ISSN 2045-2322. PMC 11341869. PMID 39174824.

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