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Danaus erippus
''Danaus erippus'', the southern monarch, is a milkweed butterfly (subfamily Danainae) in the family Nymphalidae. It is one of the best known butterflies in South America. Its genome is nearly identical to ''D. plexippus'', but the two are incompatible, and therefore considered separate species.〔Hay-Roe, M.M., Lamas, G. & Nation, J.L. (2007). Pre- and postzygotic isolation and Haldane rule effects in reciprocal crosses of ''Danaus erippus'' and ''Danaus plexippus'' (Lepidoptera: Danainae), supported by differentiation of cuticular hydrocarbons, establish their status as separate species. ''Biological Journal of the Linnean Society'' 91:445–453.〕
==Description==
''Danaus erippus'' is included with other Nymphalidae, the largest family of butterflies with about 6000 species distributed throughout most of the world. It has a reduced pair of forelegs, is brightly coloured, and is included with popular species such as the emperors, admirals, tortoiseshells, and fritillaries.
Its wingspan reaches about , with an easily recognizable orange and black pattern. Until 2007, this butterfly was treated as a subspecies of ''Danaus plexippus''. These species are very similar, but ''D. erippus'' usually has an orange trailing edge of the forewings, while in ''D. plexippus'' it is black. The lineages of the two species are thought to have separated about 2 million years ago. The colour of the wings in males of the southern monarch is paler than in the females.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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