Temporal range: 23–5 Ma Miocene
An additional species from Venezuela, P. venezuelanum, was named by R. Collins in 1935. from fossils found in the Portuguesa state and additional remains from the Acre state in Brazil. However, this species was later reclassified in their own genus, Pseudoprepotherium, as a basal member of another family of ground sloths, the Mylodontidae.
-  A History of Land Mammals in the Western Hemisphere, by William Berryman Scott
- Collins, R.L., 1934. Venezuelan Tertiary Mammals. Johns Hopkins University Studies in Geology (11), 23-244.
- M. A. Cozzuol. 2006. The Acre vertebrate fauna: Age, diversity, and geography. Journal of South American Earth Sciences 21:185-203
- Hirschfeld SE. 1985. Ground sloths from the Friasian La Venta Fauna, with additions to the pre-Friasian Coyaima Fauna of Colombia, South America. University of California Publications, Geological Sciences 128: 1–91.
- Marcelo R. Sánchez-Villagra,Orangel A. Aguilera,Alfredo A. Carlini. The fossil vertebrate record of Venezuela. In Marcelo R. Sánchez-Villagra, Orangel A. Aguilera, and Alfredo A. Carlini, Urumaco and Venezuelan Paleontology The Fossil Record of the Northern Neotropics. 2010 Publisher: Indiana University Press, p. 26