Rinconsauria

 ( Lithostrotia ) 

The membership of Rinconsauria has varied considerably between different phylogenetic analyses. As originally proposed by Calvo and colleagues, the clade included only two genera, Rinconsaurus and Muyelensaurus, which were defined to be members of the clade. Not all phylogenetic analyses have recovered Muyelensaurus and Rinconsaurus as closely related among titanosaurs. In 2011, Santucci and Campos recovered Rinconsaurus as closely related to Aeolosaurus while Muyelensaurus was recovered as a more basal titanosaur, outside the clade uniting Aeolosaurini and Saltasauridae. One analysis by Mannion and colleagues in 2019 recovered Rinconsaurus as a non-lithostrotian titanosaur and Muyelensaurus as a lithostrotian closely related to Antarctosaurus and Mendozasaurus. A phylogenetic analysis by Gallina and Otero in 2015 found Muyelensaurus to be more closely related to a clade consisting of Futalognkosaurus, Mendozasaurus, Bonitasaura, Laplatasaurus, and Uberabatitan than to Rinconsaurus.

Rinconsauria may be closely related to Aeolosaurini, and in fact several analyses have found Aeolosaurini to fall within Rinconsauria, while others have found the two clades to be separate.

• Adamantisaurus: Recovered as a member of Rinconsauria by Navarro and colleagues in 2022, but previously considered a member of Titanosauria incertae sedis
• Aeolosaurus: Recovered as a member of Rinconsauria by Navarro and colleagues in 2022, and Gorscak and colleagues in 2023, but outside Rinconsauria in several analyses
• Argyrosaurus: Recovered as a member of Rinconsauria by Gorscak and colleagues in 2023.
• Arrudatitan: Recovered as a member of Rinconsauria by Navarro and colleagues in 2022, but outside Rinconsauria by Díez Díaz and colleagues in 2025.
• Baurutitan was recovered as a member of Rinconsauria in one analysis by Díez Díaz and colleagues in 2025, but outside Rinconsauria by Gorscak and colleagues in 2023, and in another analysis by Díez Díaz and colleagues in 2025.
• Bonitasaura: Recovered as a member of Rinconsauria by Gorscak and colleagues in 2023, while several analyses have found it to be outside Rinconsauria.
• Brasilotitan: recovered as member of Rinconsauria by Navarro and colleagues in 2022, but outside Rinconsauria by Filippi and colleagues in 2023.
• Bravasaurus: Recovered as a member of Rinconsauria by Navarro and colleagues in 2022.
• Chadititan: Recovered as a member of Rinconsauria in its original description by Agnolín and colleagues in 2025.
• Gondwanatitan: Recovered as a member of Rinconsauria by Navarro and colleagues in 2022, Gorscak and colleagues in 2023, but outside Rinconsauria by Calvo and colleagues in 2007 and Agnolín and colleagues in 2025.
• Maxakalisaurus: Recovered as a member of Rinconsauria by Navarro and colleagues in 2022, but outside Rinconsauria by Gorscak and colleagues in 2023.
• Narambuenatitan: Recovered as a member of Rinconsauria by Pérez Moreno and colleagues in 2022, but outside Rinconsauria by Filippi and colleagues in 2023.
• Ninjatitan: Recovered as a member of Rinconsauria by Pérez Moreno and colleagues in 2022, but outside Rinconsauria by Filippi and colleagues in 2023.
• Normanniasaurus was recovered as a member of Rinconsauria in one analysis by Díez Díaz and colleagues in 2025, and outside Rinconsauria, albeit closely related to it, in another analysis by Díez Díaz and colleagues in 2025, and by Gorscak and colleagues in 2023.
• Overosaurus: Recovered as a member of Rinconsauria by Gorscak and colleagues in 2023, and Agnolín and colleagues in 2025, but outside Rinconsauria by Filippi in colleagues in 2023 and Mocho and colleagues in 2024.
• Panamericansaurus: Recovered as a member of Rinconsauria by Gorscak and colleagues in 2023.
• Pitekunsaurus: Recovered as a member of Rinconsauria by Pérez Moreno and colleagues in 2022 and Agnolín and colleagues in 2025, but outside Rinconsauria in several analyses.
• Punatitan: Recovered as a member of Rinconsauria by Hechenleitner and colleagues in 2020, and Navarro and colleagues in 2022, but outside Rinconsauria by Agnolín and colleagues in 2025.
• Rukwatitan: Recovered as a member of Rinconsauria by Díez Díaz and colleagues in 2025, but outside Rinconsauria by Gorscak and colleagues in 2023.
• Shingopana: Recovered as a member of Rinconsauria by Gorscak and colleagues in 2023. but outside Rinconsauria by Díez Díaz and colleagues in 2025.
• Trigonosaurus: Recovered as a member of Rinconsauria by Navarro and colleagues in 2022 and Gorscak and colleagues in 2023, but outside Rinconsauria by Díez Díaz and colleagues in 2025.
• Uberabatitan: Recovered as member of Rinconsauria by Navarro and colleagues in 2022, but outside Rinconsauria by Filippi and colleagues in 2023 and Díez Díaz and colleagues in 2025.