Hydrochoerus hydrochaeris et Hydrochoerus isthmius ad subfamiliamHydrochoerinarum cum duabus generis Kerodontis speciebus pertinent. Quae omnes, cum earum cognatis exstinctis, olim in Hydrochoeridas, suam familiam, digerebantur.[5] Ex autem anno 2002, studia phylogeneticamolecularia coniunctionem artam Hydrochoeri et Kerodontis agnoscunt,[6] locum amborum generum in subfamilia Caviidarum suadentia.
Classificationespaleontologicae olim nomen Hydrochoeridarum pro omnibus ex his animalibus adhibebant, cum nomen Hydrochoerinam generi exstanti et eius artissimis cognatis fossilibus, sicut Neochoero, retinerent,[7][8] sed classificationem Hydrochoerinarum intra Caviidas recentius asciverunt.[9]Taxinomia hydrochoerinarum fossilium in dubio etiam est. Annis recentibus, earum diversitas magnopere imminuitur,[10][11] praecipue quia nunc agnoscitur quod forma dentiummolarium hydrochoerinarum per vitam unius animalis magnopere variare.[12] Materia olim ad quattuor genera et septem species secundum variationes formae molaris nunc repraesentare putatur singula animalis Cardiatherii paranensis, unius speciei, per varias vitae aetates.[13]
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Barreto, Guillermo R, et Emilio A. Herrera. 1998. "Foraging patterns of capybaras in a seasonally flooded savanna of Venezuela." Journal of Tropical Ecology 14 (1): 87–98. JSTOR 2559868. doi:10.1017/S0266467498000078.
Burton, M., et R. Burton. 2002The International Wildlife Encyclopedia. Marshall Cavendish. ISBN 0-7614-7269-X.
Deschamps, Cecilia M., Itatí Olivares, Emma Carolina Vieytes, et María Guiomar Vucetich. 2007. "Ontogeny and diversity of the oldest capybaras (Rodentia: Hydrochoeridae; late Miocene of Argentina)." Journal of Vertebrate Paleontology 27, no. 3 (12 Septembris): 683–92. doi:10.1671/0272-4634(2007)27[683:oadoto]2.0.co;2. JSTOR 30126368.
Lord, Rexford D. 1994. "A descriptive account of capybara behaviour." Studies on Neotropical Fauna and Environment 29 (1): 11–22. doi:10.1080/01650529409360912.
Lord, Rexford D. 2009. Capybaras: a natural history of the world's largest rodent. Baltimorae: Johns Hopkins University Press. ISBN 9780801891632, ISBN 0801891639.
Mones, Alvaro, et Juhani Ojasti. 1986. "Hydrochoerus hydrochaeris." Mammalian Species (264): 1–7. doi:10.2307/3503784. JSTOR 3503784.
Moreira, José Roberto, et al., eds. 2013. Capybara: biology, use and conservation of an exceptional neotropical species. Novi Eboraci: Springer. ISBN 9781461439998, ISBN 146143999X.
Quintana, R. D., S. Monge, et A. I. Malvárez. 1998. "Feeding patterns of capybara Hydrochaeris hydrochaeris (Rodentia, Hydrochaeridae) and cattle in the non-insular area of the Lower Delta of the Paraná River, Argentina." Mammalia 62 (1). doi:10.1515/mamm.1998.62.1.37.
Rowe, Diane L., et Rodney L. Honeycutt. 2002. "Phylogenetic Relationships, Ecological Correlates, and Molecular Evolution Within the Cavioidea (Mammalia, Rodentia)." Molecular Biology and Evolution 19, no. 3 (Martius): 263–77.
Vucetich, María G., Cecilia M. Deschamps, Itatí Olivares, et María T. Dozo. 2005. "Capybaras, size, shape, and time: A model kit." Acta Palaeontologica Polonica 50 (2): 259–72.
Josephoartigasia monesi, species exstincta, maximum rodens notum