Caviomorph Rodent Evolution and Phylogenetics
Summary
Caviomorph rodents represent a remarkable adaptive radiation of hystricognath rodents in South America, having colonised the continent from African ancestors in the Eocene. Once isolated on the newly emergent landmass, these rodents diversified into multiple families, including Cavioidea (guinea pigs and capybaras), Octodontoidea (spiny rats and degus) and Erethizontoidea (New World porcupines). Their evolution was shaped by major geological events: the Andean uplift created novel habitats and ecological opportunities, while repeated connections between the Amazon and Atlantic forests fostered dispersal and vicariance. Modern phylogenetic frameworks integrate mitochondrial and nuclear DNA with fossil evidence to resolve relationships among genera and to date key divergences. These studies reveal a basal split in the late Eocene, a pulse of lineage diversification in the early Miocene, and subsequent radiations associated with climatic shifts in the Miocene and Pliocene. Caviomorph rodents have become model organisms for understanding how continental isolation, mountain building and climate change drive evolutionary innovation, biogeographic patterns and community assembly in terrestrial mammals.
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Caviomorph Rodent Evolution and Phylogenetics publication trend
The graph below shows the total number of articles in caviomorph rodent evolution and phylogenetics across all publications each year (not limited to Nature Index journals).
Technical terms
Caviomorpha: Infraorder of New World hystricognath rodents native to South America.
Hystricognathi: Suborder of rodents characterised by a specialised jaw and muscle configuration.
Mitogenome: Complete mitochondrial DNA sequence used to infer phylogenetic relationships.
Molecular clock: Analytical method for estimating divergence times based on genetic mutation rates.
Vicariance: Speciation mechanism in which geographic barriers lead to population isolation and divergence.
References
- Mitogenomic Phylogeny, Diversification, and Biogeography of South American Spiny Rats. Molecular Biology and Evolution (2016).
- Phylogeny and chronology of the major lineages of New World hystricognath rodents: insights on the biogeography of the Eocene/Oligocene arrival of mammals in South America. BMC Research Notes (2013).
- Major Radiations in the Evolution of Caviid Rodents: Reconciling Fossils, Ghost Lineages, and Relaxed Molecular Clocks. PLOS ONE (2012).
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