M. rubra may refer to: Marmosa rubra, the red mouse opossum, a South American marsupial species Mesogona rubra, a moth species found in the Cascade Mountains north to Skamania County, Washington, United States Microhyla rubra, a narrow-mouthed frog species found in India Miomantis rubra, a praying mantis species Morus rubra, the red mulberry, a plant species native to eastern North America Mycteroperca rubra, the mottled grouper, a fish species Myrica rubra, the yangmei or Chinese strawberry tree, a subtropical tree species Myrmica rubra, the European fire ant or common red ant, an ant species found all over Europe