Simulium (Simulium) chamlongi Takaoka & Suzuki 1984

Simulium (Simulium) chamlongi Takaoka & Suzuki, 1984

Simulium (Simulium) chamlongi Takaoka & Suzuki, 1984: 27 –30 (Female, male, pupa and larva).

Specimens examined. Six females, three males and five mature larvae collected from a small stream (width 1–2 m, water temperature 16.0˚C, exposed to the sun, altitude 1,492 m) (12˚07’59.430” N/108˚35’42.001” E) slowly flowing in open land, 45 km from Dalat, Da Chais, Lac Duong, Lam Dong Province, southern Vietnam, 24-IV- 2014, by H. Takaoka, M. Sofian-Azirun, Z. Ya’cob, C.D. Chen & K.W. Lau.

Distribution. Thailand, China, Myanmar and Vietnam.

Remarks. This species was described from Thailand (Takaoka and Suzuki 1984), and later recorded from Vietnam (Crosskey and Howard 1997). The pupa of this species is characterized by the frons lacking tubercles. The male upper-eye facets were described to be in about 19 vertical columns in the original description (Takaoka and Suzuki 1984) but the number of the male upper-eye facets was in 21–23 vertical columns and 22 or 23 horizontal rows when recently collected male specimens of S. (S.) chamlongi from the type locality (Doi Inthanon National Park, Thailand) were examined. The males of S. (S.) chamlongi collected from Vietnam have a similar number of male upper-eye facets (21 or 22 vertical columns and 22 horizontal rows).