Microdipodops oregonus
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Formerly included in Microdipodops megacephalus, genetic analysis by Hafner et al. (2025) revealed that the No common name found for Microdipodops oregonus is a distinct species. Hafner et al. (2025) referred to the Oregon kangaroo mouse as Microdipodops oregonus. However, Zijlstra (2026) noted that Microdipodops californicus has nomenclatural priority and is therefore the valid name under the principle of priority.
References
Hafner, JC, Upham NS, Gowen-Huang F, Light JE. 2025. Cryptic species and taxonomic revision of kangaroo mice, the rodent genus Microdipodops. Journal of Mammalogy 106(6): 1342-1371.
Zijlstra JS. 2026. Species before subspecies: the names of mammal species first named as subspecies. Journal of Mammalogy 107(4):915–918. https://doi.org/10.1093/jmammal/gyag049