Ichnogenus: Tridigitichnus CASAMIQUELA, 1996
Etymology: In reference to three digits, combined with the suffix -ichnus, hwich indicates its ichnological nature.

Ichnospecies: inopinatus CASAMIQUELA, 1996
Etymology: In reference to the unexpected charater of both the morphology and the discovery.

Holotype: CICRN 15-IV-78/1/#IV, V

Locality: Monton Ilo Quarry, Rio Negro Province, Patagonia, Arentina.

Horizon: Angostura Colorada Formation.

Biostratigraphy:

Age: Campanian-Maastrichtian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous.

Material: IV pes, V manus prints.

Note: On the same slab of Patagonichnornis venetorium.