Simulium (Gomphostilbia) siamense Takaoka & Suzuki, 1984

Simulium (Gomphostilbia) siamense Takaoka & Suzuki, 1984: 14 –18 (Female, male, pupa and larva).

Distribution. Thailand and Vietnam.

Remarks. This species was described from Thailand by Takaoka and Suzuki (1984), and later recorded from Vietnam by Crosskey and Howard (1997). No detailed information of this record was given, leaving the locality in Vietnam unknown. There is a possibility that the taxa regarded as S. (G.) siamense and S. (G.) duolongum are the same species because the pupal gills of both species are morphologically indistinguishable from each other (Takaoka and Suzuki 1984; Takaoka and Davies 1995).