A third species was named by Calvo and Salgado in 1995, "Rebbachisaurus tessonei". It was discovered in the Candeleros Formation in Argentina, near to where the holotype of "Giganotosaurus carolinii" was discovered. This species was later moved to the new genus "Limaysaurus" in 2004. In 2010, Gregory S. Paul estimated "Rebbachisaurus" at and . Holtz gave a bigger length of . In 2020 Molina-Pérez and Larramendi gave a larger estimation of 26 meters (85.3 ft) and 40 tonnes (44 short tons). It possessed a small head, a long, graceful neck and a whiplike tail. "Rebbachisaurus" is distinguished from other sauropods by its unusually tall, ridged back and the spine or sail that lay atop its back, distinguished by the tall ridges of the preserved dorsal vertebrae of the holotype and other specimens. Below is a cladogram following the 2013 analysis by Fanti and colleagues, which confirmed the placement of "Rebbachisaurus" as a basal rebbachisaurid. A 2015 cladistic study by Wilsona and the French palaeontologist Ronan Allain found "Rebbachisaurus" itself to group with the nigersaurines, and the authors suggested that Nigersaurinae was therefore a junior synonym of Rebbachisaurinae (since that name would have priority). The most common vertebrate remains which coexisted alongside "R. garasbae" in the Aoufous belong to the elasmobranch fish "Onchopristis numidus". Another seven elasmobranchs are reported: "Asteracanthus aegyptiacus", "Distobatus nutiae", "Tribodus" sp., "Lissodus" sp., "Haimirichia amonensis", Cretoxyrhinidae indet., and "Marckgrafia lybica". Lungfish fossils are referred to "Ceratodus humei" and "Neoceratodus africanus". Coelacanth remains are referred to "Mawsonia lavocati" and to the genus "Axelrodichthys". Several taxa of Cladistia and two genera of seminiomorphs (an unnamed "Lepidotes"-like species and "Oniichthys falipoui") are recovered in the Kem Kem beds.