Species: pigmaeus CASAMIQUELA, 1974
Etymology: Greek, pygmaios, "dwarf."
Holotype: CTEZ-PZ 1711
Locality: Arroyo Picun Leufu, Neuquen Province, Northern Patagonia, Argentina.
Horizon: Vaca Muerta Formation (originally believed to have been from the Middle Jurassic Lotena Formation)
Age: Tithonian Stage, Upper Malm Epoch, Late Jurassic.
Material: Sacrum, pelvis, femora and phalange.
Note: Originally thought to belong to the family Compsognathidae.