 The latter species is therefore often considered invalid; a recent study considers it indeed valid, but distinct enough not to belong into "Paraptenodytes".The fossils were found in the Santa Cruz and Chubut Provinces of Patagonia, Argentina, in the Gaiman, Monte León and Santa Cruz Formations of Early to Middle Miocene age.Later occurrences are apparently from Late Miocene or possibly even Early Pliocene deposits.