patric species. In fact, in groups 1 and 2 genera, allopatric species are more divergent than sympatric species (Fig. 8.3). This pattern is largely due to the existence of a large fraction of ancient allopatric neighbors, species that have diverged from sister taxa long ago and are separated by no insurmountable major geographic barrier, such as a land mass, even in early-stage genera. Dividing the species into allopatric and sympatric comparisons shows that divergence between sympatric species increases stage by stage but that divergence between allopatric species does not (Fig. 8.3).
Further comparisons show that most sympatric species are found in genera in which the sperm recognition protein bindin is evolving quickly
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8 Evolutionary Animation: How Do Molecular Phylogenies Compare to Mayr’s Reconstruction of Speciation Patterns in the Sea?--STEPHEN R. PALUMBI AND H. A. LESSIOS ."
Systematics and the Origin of Species: On Ernst Mayr's 100th Anniversary . Washington, DC: The National Academies Press,
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