Venetoraptor

Venetoraptor Temporal range: Late Triassic
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Archosauria
Clade:	Avemetatarsalia
Clade:	Ornithodira
Clade:	†Pterosauromorpha
Family:	†Lagerpetidae
Genus:	†Venetoraptor Müller et al., 2023
Species:	†V. gassenae
Binomial name
†Venetoraptor gassenae Müller et al., 2023

Venetoraptor (meaning "Vale Vêneto plunderer") is an extinct genus of lagerpetid archosaurs from the Late Triassic Santa Maria Formation (Paraná Basin) of Rio Grande do Sul, Brazil. The genus contains a single species, V. gassenae, known from a partial skeleton.

Discovery and naming

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Venetoraptor type locality in Rio Grande do Sul, Brazil

The Venetoraptor holotype specimen, CAPPA/UFSM 0356, was discovered in the Santa Maria Formation (Hyperodapedon Assemblage Zone) in the Paraná Basin of São João do Polêsine in Rio Grande do Sul, Brazil. The partially-articulated specimen consists of an incomplete skull, cervical, dorsal, and caudal vertebrae, a partial pelvic girdle, and elements of the arms and legs.

In 2023, Müller et al. described Venetoraptor gassenae as a new genus and species of lagerpetid archosaur based on these fossil remains. The generic name, "Venetoraptor", combines a reference to the tourist locality "Vale Vêneto" with the Latin word "raptor", meaning "plunderer". The specific name, "gassenae", honors Valserina M. B. Gassen, a founder of the paleontology center at the Federal University of Santa Maria.

Description

Size of Venetoraptor compared to a human

Venetoraptor is estimated at 96.1 centimetres (37.8 in) long, and 33.4 centimetres (13.1 in) tall at the hip. The premaxilla is toothless with a sharp, pointed end comparable to the beaks of phorusrhacids and falconiforms. The surface of the premaxilla bears striations, which may indicate the presence of a rhamphotheca or similar keratinous covering in life. The tip of the dentary is similarly textured, and may have also been covered in keratin. It is unknown if Venetoraptor had teeth in the rest of its mouth. The length of the metacarpals increases in length from digits I to IV, like the dinosauriform Saltopus and many pterosaurs. In the more closely related Scleromochlus and Dromomeron romeri, metacarpal III is the longest. The hands of Venetoraptor bear long, scythe-like claws. Like other lagerpetids as well as early pterosaurs, its vertebrae are proportionately short.

Paleobiology

The recurved beak and grasping hands with large claws of Venetoraptor may indicate a scansorial lifestyle, allowing it to climb and consume food more easily. Birds with raptor-like beaks are more adapted for tearing flesh and the consumption of hard fruit. However, whether the diet of Venetoraptor followed similar trends is unknown. Details of the arms and legs support the loss of obligatory quadrupedalism in Venetoraptor and its relatives, so a bipedal lifestyle is more likely.

Classification

Müller et al. (2023) recovered Venetoraptor as a member of the pterosauromorph clade Lagerpetidae, as the sister taxon to 'Dromomeron' gregorii. Ixalerpeton, which has also been found in the Santa Maria Formation, was recovered as the sister taxon to the clade containing D. romeri and D. gigas. The results of their phylogenetic analyses are shown in the cladogram below:

Archosauria	Pseudosuchia Pan-Aves Aphanosauria Ornithodira Lagosuchus Silesauridae Dinosauria Pterosauromorpha Lagerpetidae Faxinalipterus Scleromochlus Lagerpeton Venetoraptor 'Dromomeron' gregorii Ixalerpeton Dromomeron romeri Dromomeron gigas Pterosauria

Paleoenvironment

Venetoraptor was discovered in layers of the Hyperodapedon Assemblage Zone within the Santa Maria Formation, which dates to the Carnian age of the Late Triassic period, about 233.23 million years old. Several other animals have been recovered from this locality, including the temnospondyl Compsocerops, several synapsids, pseudosuchians, avemetatarsalians (including various dinosaurs), and other reptiles.