Ichnogenus: Deferraiischnium CALVO, 1991
Etymology: In honor of Prof. Oscar De Ferrariss, director of Museo de Ciencias Naturales de la Universididad Nacional del Comahue, promoter of paleontology in that region and Greek, ischium, "

Ichnospecies: mapuchensis CALVO, 1991
Etymology: mapucheniss, a region in Patagoina, province of Neuquen, Argentina.

Holotype: In situ.

Locality: Nueva peninsula, 15 km from Picun Leufo, Patagonia, province of Neuquen, Argentina.

Horizon: Lower Candeleros member, Rio Limay Formation.

Biostratigraphy:

Age: Aptian Stage, Middle Gallic Subepoch, Upper Gallic Subepoch-Cenomanian Stage?, Uppermiddle Gallic Subepoch, Lower Gulf Epoch, Early Cretaceous.

Material: 9 3 toed footprint.

Plastotype: MUCPv-62: 3 3-toed footprints.

Hypodigm:

MUCPv-63: Footprint.

MUCPv-66: Footprint.