Hydrochoerinae Gray, 1825

Vucetich, María Guiomar, Deschamps, Cecilia M., Vieytes, Emma Carolina & Montalvo, Claudia I., 2014, Late Miocene capybaras from Argentina: Skull anatomy, taxonomy, evolution, and biochronology, Acta Palaeontologica Polonica 59 (3), pp. 517-535 : 523

Subfamily Hydrochoerinae Gray, 1825

Emended diagnosis.—Hydrochoerids with cheek teeth with deep re-entrant folds, with two new re-entrant folds on m1–3, one lingual (tertiary internal flexid), and one labial (secondary external flexus); labial re-entrant folds on P4–M2 dissimilar in length, with the primary external flexus being long and the secondary external flexus being very short; M3 with many thin laminae; paraoccipital apophyses robust, very long, and laterally compressed.

Remarks.—This taxon corresponds to Hydrochoeridae of previous authors (e.g., Mones 1991). Only those hydrochoerids sharing the characters above are here considered to be capybaras.