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Difficulties in applying the morphological species concept

Description
In some cases, members of the same species can appear quite different. (a) Two morphs of a single species, the Variable Darner (Aeshna interrupta), which is found across Canada. (b) Two different species of damselfly found in Canada, Hagen's bluet (Enellagma hageni, left) and the Marsh bluet (Enellagma ebrium, right), which look similar.
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