Baranomys longidens is an extinct species of rodent from the Baranomys genus, from the Baranomyinae subfamily of the Cricetidae family. It lived in Pliocene epoch and was an ancestor to modern Arvicolinae.Wilson Don E., Reeder DeeAnn M. (editors): Arvicolinae. In: Mammal Species of the World. A Taxonomic and Geographic Reference, vol. 3. Johns Hopkins University Press, 2005. The fossils of the animals have been found in Europe, including near Gundersheim, Germany, and in Poland.Global Biodiversity Information FacilityOldrich Fejfar, Heinrich Wolf-Dieter: Microtoid cricetids and the early history of arvicolids (Mammalia, Rodentia). In: Palaeontologia Electronica. Society of Vertebrate Paleontology, 2011. It was first described by Kazimierz Kowalski in 1960.Baranomys in Index of Scientific Names as Global Namse Index.

Discovery The fossils of the animals have been found in Europe, including near Gundersheim, Germany, and in Poland. The species was first described by Kazimierz Kowalski in 1960. He based his research on fossils in a breccia rock, which were found in the Węże Nature Reserve, near the village of Węże in Łódź Voivodeship, Poland. It was first classified as microtodon longidens, and later reclassified as baranomys longidens.Andrzej Sulimski: PLIOCENE LAGOMORPHA AND RODENTIA FROM WĘŻE I (POLAND): Study on the Tertiary bone breccia fauna from Węże near Dzialoszyn in Poland. In: ACTA PALAEONTOLOGICA POLONICA. IX, 1964. Polish Academy of Sciences.Kazimierz Kowalski: Cricetidae and Microtidae from the Pliocene of Weże (Poland). In: Acta zoologica cracoviensia. 5 (11), p. 447–506, 1960.

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