A species complex is a group of related species, where the exact demarcation between species is often unclear or cryptic. The demarcation difficulty may be due to their recent and as yet incomplete reproductive isolation. Superspecies and cryptic species complexes are examples of species complexes. A ring species is another situation where complex...
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http://en.wikipedia.org/wiki/Species_complex
A group of very closely related species or subspecies. For example, the yellow wagtails create a species complex made up of several closely related subspecies.
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http://www.kuwaitbirds.org/birding/glossary
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