Genus: Vivaron LESSNER, STOCKER, SMITH, TURNER, IRMIS, & NESBITT, 2016
Etymology: Vivaron, named for the mythical 30-foot rattlesnake demon believed to haunt Orphan Mesa at Ghost Ranch (Poling-Kempes, 2005). 

Species: haydeni LESSNER, STOCKER, SMITH, TURNER, IRMIS, & NESBITT, 2016
Etymology: In honor of John Hayden, who discovered the Hayden Quarry from whicht the  type and referred material was collected.

Holotype: GR 263

Locality: Hayden Quarry 2 paleochannel, Ghost Ranch, Rio Arriba County, New Mexico.

Horizon: Petrifed Forest Formation, Chinle Group.

Biostratigraphy:

Age: Middle Norian Stage, Upper Late Triassic Epoch, Late Triassic.

Material: Right maxilla.

Referred mateiral:

GR 186: Left Maxilla.

GR 391: Left premaxilla.

GR 451: Right ectopterygoid.

GR 560, 664: 2 teeth.

GR 638: Right ilium.

GR 639: Right quadrate.

GR 640: Right ectopterygoid.

GR 641: Left jugal.

GR 642: Right ilium.