The collected remains included cervical, dorsal, sacral, and caudal vertebrae, portions of pectoral and pelvic girdles, and several hind limb bones.

Within the collection were several duplicate bones, such as the ilia, pubes, femora and tibiae, that exhibited similar morphological features of typical abelisauroid traits.

It was interpreted by Novas et al. that the entire theropod collection from this quarry may be referred to the single species Rahiolisaurus.

[4] In 2014, the subfamily Majungasaurinae was erected by palaeontologist Thierry Tortosa to separate the newly discovered European Arcovenator, Majungasaurus, Indosaurus, Rahiolisaurus, and Rajasaurus from South American abelisaurids based on physical characteristics such as elongated antorbital fenestrae in front of the eye sockets, and a sagittal crest that widens into a triangular surface towards the front of the head.

[7] Kryptops Genusaurus Arcovenator Rajasaurus Indosaurus Majungasaurus Xenotarsosaurus Dahalokely Rahiolisaurus Ilokelesia Ekrixinatosaurus Skorpiovenator Llukalkan Pycnonemosaurus Quilmesaurus Viavenator Carnotaurus Aucasaurus Abelisaurus

Rahiolisaurus has been found in the Lameta Formation, a rock unit radiometrically dated to the Maastrichtian age of the latest Cretaceous representing an arid or semi-arid landscape with a river flowing through it–probably providing shrub cover near the water–which formed between episodes of volcanism in the Deccan Traps.

[12] Several dinosaurs have been described from the Lameta Formation, such as the noasaurid Laevisuchus; abelisaurids Indosaurus, Indosuchus, Lametasaurus, and Rajasaurus; and the titanosaurian sauropods Jainosaurus, Titanosaurus, and Isisaurus.