Figure 7. A hypothetical view of reticulate evolutionary change within a group of species belonging to a single syngameon, after Veron (2000a). At time 0 the group forms three principal species, each of which is distinct and widely dispersed by strong ocean currents. At time 1 the group forms many species that are geographically isolated because of weak ocean currents. At time 2 the group forms four species that are again widely dispersed by strong currents. Over the long geological interval to time 3 the group has been repackaged several times.