M. oregonensis may refer to:
- Marmara oregonensis, a moth species
- Metagonimoides oregonensis, a trematode species found in North America
- Methanolobus oregonensis, an Archaea species in the genus Methanolobus
- Moropus oregonensis, an extinct mammal species in the genus Moropus
This disambiguation page lists articles associated with the same abbreviated species scientific name.
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