Species: madtsoioides ALBINO, 1987
Etymology:

Holotype: MACN-RN 32

Locality: Ea. Los Alamitos, Rio Negro Province, Patagonia, Argentina.

Horizon: Los Alamitos Formation.

Biostratigraphy:

Age: Allenian Tetrapoda Assemblage, Late Campanian-Early Maastrichtian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material: Mid-trunk vertebra.

Referred material:

MACN-Pv 226: Fragmentary trunk vertebra.

 

= cf. Rionegrophis madtsoioides NOVAS, AGNOLIN, ROZADILLA, ARANIAGA-ROLANDO, BRISSON-EGLI, MOTTA, CERRONI, EZCURRA, MARTINELLI, D'ANGELO, ALVAREZ-HERRERA, GENTIL, BOGAN, CHIMENTO, GARCIA-MARSA, LO COCO, MIQUEL, BRITO, VERA, PEREZ LOINAZE, FERNANDEZ & SALGADO, 2019

Locality: Titanosaur tibia site (locality 2), about 30 km to the SW of the town of El Calafate, Austral Basin, Santa Cruz Province, Argentina.

Horizon: Chorrillo Formation.

Biostratigraphy:

Age: Late Campanian-Early Maastrichtian Stage, Upper Senonian Sub-epoch, Upper Gulf Epoch, Late Cretaceous.

Material:

MPM 21523: Partial vertebra.

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