Genus: Ecteninion MARTINEZ, MAY & FORSTER, 1996
Etymology: Greek, ekteino, “stretched out” and Greek, inion, “back of head.”

Species: lunensis MARTINEZ, MAY & FORSTER, 1996
Etymology: Refers to the Valle de la Luna in Ischigualasto Provincial Park, Argentina.

Holotype: PVSJ 422

Locality: North side of the Cancha de Bochas area in the Ischigualasto Provincial Park, San Juan Province, Argentina.

Horizon: Lower half of the Ischigualasto Formation.

Biostratigraphy:

Age: Late Carnian Stage, Late Triassic Epoch, Late Triassic.

Material: Skull and lower jaws, lacking both zygomatic arches.