Arvicolid rodents of the early Pleistocene Java local fauna from north-central South Dakota

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Abstract
Eight arvicolid species are present in the Java local fauna, Walworth County, South Dakota. They include Pliophenacomys, cf. P. osborni, cf. Hibbardomys marthae, Hibbardomys zakrzewskii, sp. nov., Mimomys dakotaensis, sp. nov., Ondatra annectens, Synaptomys (Mictomys) kansasensis, Guildayomys, cf. G. hibbardi, and Microtus (Phaiomys) pliocaenicus. This aggregation is unique and is part of one of the earliest local faunas on the continent with Microtus. A comparison of the Java insectivores, lagomorphs, and rodents with those from the late Blancan White Rock and middle Irvingtonian Cudahy local faunas of Kansas suggests that the Java fauna is of early Pleistocene age.