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Mammalia - Notoungulata - Notostylopidae
It was reranked as the unranked clade Notostylopidae by Bradham et al. (2015).
It was assigned to Tillodontia by Ameghino (1897); to Notioprogonia by Simpson (1935), Simpson (1948), Vucetich (1980) and Carroll (1988); and to Notoungulata by Bradham et al. (2015) and Deraco and GarcÍa-López (2016).
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.