different between hystricognath vs caviomorph

English

hystricognath (plural hystricognaths)

(zoology) Any member of the infraorder Hystricognathi of rodents, distinguished from other rodents by the bone structure of their skulls.
- 1996, José Roberto Moreira, David W. Macdonald, 7: Capybara use and conservation in South America, V.J. Taylor, N. Dunstone (editors) Exploitation of Mammal Populations, page 89,
  The New World hystricognath rodents (= caviomorphs) today represent one of the most diverse and widespread suborders among the over 800 mammal species of South America (Woods, 1982).
- 2008, Felipe Bandoni de Oliveira, Eder Cassola Molina, Paul A. Garber, Gabriel Marroig, Chapter 3: Paleogeography of the South Atlantic: a Route for Primates and Rodents into the New World?, Alejandro Estrada, Julio Cesar Bicca-Marques, Eckhard W. Heymann, Karen B. Strier (editors), South American Primates, page 63,
  The situation is similar with respect to rodents, given that the earliest undisputed hystricognaths are from the Oligocene of Pakistan and Egypt (ca. 35Ma), with the possibility of a Middle Eocene origin for the group (Bryant and McKenna 1995; Marivaux et al. 2002).

caviomorph (plural caviomorphs)

Any rodent of the infraorder (sometimes parvorder) Caviomorpha, that unites all South American hystricognaths.
- 2012, Larry G. Marshall, The Geat American Interchange—An Invasion-Induced Crisis for South American Mammals, Matthew Nitecki (editor), Biotic Crises in Ecological and Evolutionary Time, page 192,
  In beds of Deseadan age caviomorphs are represented by 6 families (9 genera), in the Santacrucian by 7 families (17 genera), and in the Hayquerian by 8 families (21 genera) (Marshall et al. In press b).

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