The widespread and common butterfly "species" of western North America known as the Mormon Metalmark (Apodemia mormo) is in fact almost surely a complex of several distinct species, but the systematics of this group requires further study (Brock and Kaufman 2003).
- Brock, J.P. and K. Kaufman. 2003. Butterflies of North America. Houghton Mifflin, New York.
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