Abstract
Cricetid rodents have a very high reproductive capacity and usually a short life span, measured in months rather than years. Many of them are also non-gregarious, searching for new resources outside the confines of their present habitat. These features provide cricetid rodents with valuable attributes as agents of historical biology. We describe a new species of cricetid rodent, Paciculus walshi, an Oligocene cricetid rodent in North America; we characterise its enamel microstructure and dental features and review its relationship with other cricetid rodents globally, to place it within the framework of Oligocene historical biology.
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