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Definition: A branching of population lineages to form separate species in which the diverging lineages are mostly nonoverlapping in geographic distribution but make contact along a narrow borderline. This controversial mode of speciation contrasts with allopatric speciation and sympatric speciation.
Source: Hickman, C.P., et al. 2011. Integrated Principles of Zoology. Fifteenth Edition. McGraw-Hill Higher Education.