The black flies (Diptera: Simuliidae) of Vietnam Author Takaoka, Hiroyuki Author Sofian-Azirun, Mohd Author Ya’Cob, Zubaidah Author Chen, Chee Dhang Author Lau, Koon Weng Author Low, Van Lun Author Pham, Xuan Da Author Adler, Peter H. text Zootaxa 2017 4261 1 1 165 journal article 33106 10.5281/zenodo.571608 06d40acc-4fc2-4de6-9aab-96f3776ef44c 1175-5326 571608 C097C43E-D522-46C4-9D64-76D3CD4BAD86 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 ).