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Mammalia - Rodentia
It was reranked as the unranked clade Hystricomorpha by Gadow (1898); it was reranked as the superfamily Hystricomorpha by Hay (1902); it was reranked as the suborder Hystricomorpha by Sostillo et al. (2014).
It was assigned to Rodentia by Gadow (1898); to Simplicidentata by Hay (1902); to Hystricognathi by Carroll (1988) and Nowak (1999); and to Rodentia by Ameghino (1894), Ameghino (1897), Paula Couto (1956) and Sostillo et al. (2014).
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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.