2 articles
Island radiations and speciation in Pacific tree snails
Pacific island tree snails, in the Hawaiian Achatinellinae and Society and Samoan Partulidae, form species-rich radiations confined to single valleys, classical examples of speciation without geographic distance.
Sympatric speciation
Sympatric speciation is the evolution of reproductive isolation between populations occupying the same range without a physical barrier, long dismissed but now accepted as real.