A research team led by Dietmar Schwarz has argued that it most likely developed within that time by hybridization of two other species: R. mendax, the blueberry maggot, and R. zephyria, the snowberry maggot.
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Few cases of animal species arising from hybridization are known (see Pomarine Skua or Mariana Mallard), although with DNA analysis more are being found.
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