Amanasaurus

Amanasaurus (meaning "rain lizard") is a genus of silesaurid dinosauriform 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.[1]

Amanasaurus
Temporal range: Late Triassic (Carnian), ~
Skeletal reconstruction showing known fossil material
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauriformes
Clade: Dracohors
Family: Silesauridae
Genus: Amanasaurus
Müller & Garcia, 2023
Species:
A. nesbitti
Binomial name
Amanasaurus nesbitti
Müller & Garcia, 2023

Discovery and naming

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 described 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]

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

Saurischia

Ornithischia
Saltopus
Lewisuchus

Soumyasaurus

Asilisaurus

Sulcimentisauria

Gamatavus

Diodorus

Lutungutali

Technosaurus

Kwanasaurus

Sacisaurus

Parapredentata
Silesauridae

Amanasaurus

Ignotosaurus

Silesaurus

Eucoelophysis

Pisanosaurus

Laquintasaura

Prionodontia


References

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