Sibling species. Closely related species that are so similar that they are nearly indistinguishable morphologically ...
sibling species Reproductively isolated species that are so similar morphologically that they are difficult or impossible to distinguish using morphological characters.
A field test of differential host-plant usage between two sibling species of Rhagoletis pomonella fruit flies (Diptera: Tephritidae) and its consequences for sympatric models of speciation. Evolution. V43. P1813(7) Dec, 1989.
 See also: Animal, Speciation, Animals, Selection, Diploid
  
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