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Speciation, the formation of new and distinct species in the course of evolution. Speciation involves the splitting of a single evolutionary lineage into two or more genetically independent lineages.
In parametric speciation, the regions where the two populations live overlap; there is no absolute geographic barrier, unlike in allopatric or peripatric speciation. The populations could become reproductively isolated from each other through behavior; they could preferentially select other members from their own population as mates and avoid outbreeding.