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A New Early Miocene Octodontoid Rodent (Hystricognathi, Caviomorpha) from Patagonia (Argentina) and a Reassessment of the Early Evolution of Octodontoidea
It is demonstrated that the early evolutionary history of Octodontoidea was characterized by the differentiation of successive lineages that survived until the early or middle Miocene, with no direct relationships with modern Octodontidae and Echimyidae.
When xenarthrans had enamel: insights on the evolution of their hypsodonty and paleontological support for independent evolution in armadillos
Astegotherium supports a recent hypothesis based on molecular data that enamel loss occurred independently not only within xenarthrans but also within dasypodid armadillos, and is therefore likely representative of ancestral cingulates and xenarthans generally.
Unexpected primitive rodents in the Quaternary of Argentina
The new fossils reinforce previous hypotheses about the survival of primitive Brazilian taxa after their extinction in the Pampas and Patagonia of southern South America and show that the diversity of caviomorph rodents during the Quaternary was greater than supposed and that an importantQuaternary extinction, not previously detected, affected several lineages.
A Middle Miocene primitive octodontoid rodent and its bearing on the early evolutionary history of the Octodontoidea
Dental evolution in Xenodontomys and first notice on secondary acquisition of radial enamel in rodents (Rodentia, Caviomorpha, Octodontidae)
It is proposed that morphological trends in the lower molars of the Xenodontomys lineage would include changes arisen as a by-product from hypsodonty, and other adaptive ones.
Adaptive diversity of incisor enamel microstructure in South American burrowing rodents (family Ctenomyidae, Caviomorpha)
Results suggest increased frequency of incisor use for digging in †Eucelophorus, which could be related to a more extreme tooth-digging strategy and/or occupancy of hard soils, and higher external index values as recurring patterns in distant clades of tooth‐digging rodents support an adaptive significance of this enamel trait.
Late Miocene Capybaras from Argentina: Skull Anatomy, Taxonomy, Evolution, and Biochronology
The systematic interpretation of Late Miocene capybaras suggests that the early radiation of this group was not as explosive as previously thought, and was likely constrained by the early acquisition of large size, increasing complexity of the cheek teeth, and probably semi-aquatic habits.
A Late Cretaceous mammal from Brazil and the first radioisotopic age for the Bauru Group
A lower premolar from the Late Cretaceous Adamantina Formation, São Paulo State, Brazil is described, representing the first radioisotopic age for the Bauru Group, a key stratigraphic unit for the study of CRETaceous tetrapods in Gondwana.
Craniodental and forelimb specializations for digging in the South American subterranean rodent Ctenomys (Hystricomorpha, Ctenomyidae)
The distribution of tooth- and scratch-digging specializations in species of the subterranean rodent Ctenomys (tuco-tucos) from diverse environments and representing different clades showed that craniodental and forelimb specializations have not been mutually exclusive in the evolution of the genus.
First Mesozoic mammal from Chile: the southernmost record of a late Cretaceous Gondwanatherian
Fil: Goin, Francisco Javier. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Division Paleontologia Vertebrados; Argentina. Consejo Nacional de Investigaciones Cientificas y…