ABSTRACT:

Mutualistic co-evolution between host plant species of the family Araceae and species-specific pollinator flies of the genus Colocasiomyia (Diptera, Drosophilidae) was observed in wet, tropical to subtropical Southeast Asia. Complicated host-plant routes suggest the adaptive radiations in both Colocasiomyia species and Araceae species. Germination rates of pollen attaching to the pollinator flies were about 70%, while germination rate of collected pollen was often lower, which suggests that the Colocasiomyia flies contribute to the male reproductive success of their host plants.