Genus: Amargastegos ULANSKY, 2014a, b (nomen dubium)
Etymology: In reference to La Amarga Creek, Neuquen Province, Argentina and Greek, stego, "covered."

Species: brevicollus ULANSKY, 2014 a, b (nomen dubium)
Etymology: Latin, brevis, "short" and Latin, collum, "neck."

Holotype: MACN-N 43:

= Stegosaurus sp BONAPARTE, 1996

Locality: 2.5 km southeast of the La Amarga Creek, on Road No. 40, Catana Lil Department, Neuquen Province, Argentina.

Horizon: Antigual Member, La Amarga Formation.

Biostratigraphy:

Age: Amargan Tetrapod Assemblage, Barremian Stage, Lower Gallic Subepoch, Lower Early Cretaceous Epoch-Aptian Stage, Middle Gallic Subepoch, Upper Early Cretaceous Epoch, Early Cretaceous.

Material: 7th cervical vertebra.

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