Alvarez, M. J., del Río, C. J. & Martínez, S. (2020 [nomenclatural availability: 2019]). Revision of the subfamily Pitarinae Stewart, 1930 (
Eucallista Dall, 1902;
Austrocallista Erdmann & Morra, 1985;
Proteopitar gen. nov.) from Cenozoic southern South America: systematic and phylogenetic analyses.
Journal of Systematic Palaeontology. 18(5): 433-460.