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Rinconsauria
Rinconsauria is an extinct clade of titanosaurian sauropods known from the late Cretaceous period of Argentina. All members of this clade are fairly small compared to the largest titanosaurs, at less than around 11 metres (36 ft) long. The membership of Rinconsauria is highly unstable; some phylogenetic analyses find the clade to be restricted to the two genera that define the clade, Rinconsaurus and Muyelensaurus, but over twenty other titanosaur genera have been included in the clade by various analyses.
Rinconsauria was coined by Calvo et al. (2007) to include their new titanosaur Muyelensaurus and the previously described Rinconsaurus. Santucci and Arruda-Campos (2011) recovered Rinconsauria as part of Aeolosaurini, as did Franca et al. (2016) and Silva et al. (2019). However, cladistic analyses by Gonzalez-Riga et al. (2019) and Mannion et al. (2019) found Aeolosaurus to be in a phylogenetically disparate position than Rinconsauria, with Rinconsauria as sister to Lognkosauria in the clade Colossosauria.
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.
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Rinconsauria
Rinconsauria is an extinct clade of titanosaurian sauropods known from the late Cretaceous period of Argentina. All members of this clade are fairly small compared to the largest titanosaurs, at less than around 11 metres (36 ft) long. The membership of Rinconsauria is highly unstable; some phylogenetic analyses find the clade to be restricted to the two genera that define the clade, Rinconsaurus and Muyelensaurus, but over twenty other titanosaur genera have been included in the clade by various analyses.
Rinconsauria was coined by Calvo et al. (2007) to include their new titanosaur Muyelensaurus and the previously described Rinconsaurus. Santucci and Arruda-Campos (2011) recovered Rinconsauria as part of Aeolosaurini, as did Franca et al. (2016) and Silva et al. (2019). However, cladistic analyses by Gonzalez-Riga et al. (2019) and Mannion et al. (2019) found Aeolosaurus to be in a phylogenetically disparate position than Rinconsauria, with Rinconsauria as sister to Lognkosauria in the clade Colossosauria.
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.