Genus: Elemgasem BAIANO, POL, BELLARDINI, WINDHOLZ, CERDA, GARRIDO & CORIA, 2022
Etymology: In reference to the Tehuelche god Elemgasem, the 'owner' of the animals and father of the southern vischa (i.e. Lagostomus viscaia: a South American rodent), inhabitant of the mountains and of the sky, founder of the northern Tehuelche people, owner of the salt of the stone, connoisseur of the 'difficult path', that is, of the passage of the beyond through the labyrinth, and with the power to pertify everyone, even himself.

Species: nubilus BAIANO, POL, BELLARDINI, WINDHOLZ, CERDA, GARRIDO & CORIA, 2022
Etymology: Latin, nubilus, "foggy days" and referes to the climatic conditions during the palaeontological expedition when this specimen was discovered. Fog is uncommon in the semiarid climate of Patagonia but it was very persistent on some of the days during which this fieldwork was carried out.

Holotype: MCF-PVPH-380

Locality: Sierra del Portezuelo locality, north area of National Route 22, c. 20 km west of Cutral Co City, Neuquen Province, Patagonia, Argentina.

Horizon: Portezuelo Formation.

Biostratigraphy:

Age: Turonina Stage, Late Gallic Subepoch, Early Gulf Epoch, Late Middle Cretaceous.

Material: Partial left epopophysis of a mid-cervical vertebra, 2 isolated middle caudal vertebrae, 3 fused middle caudal vertebrae, 2 fused posterior caudal vertebrae, 5 isolated posterior caudal vertebrae, the distal end of the right femur, a fragment of the cnemial crest of the left tibia, proximal ends of the right and left fibula, the left astragalus-calcaneum, distal fragments of the left and right metatarsals II, the proximal and distal ends of the right metatarsal III, the proximal and distal ends of the right metatarsal IV, a distal fragment of the left metatarsal IV, both pedal phalanges III-s, almost complete left phalanx IV-2 and a fragment of the right IV-2, partially preserved right and left phalanx IV-3, and the proximal portion of the left pedal ungual phalanges of the digit II and III.