Simulium ( Simulium ) chamlongi Takaoka & Suzuki, 1984

Simulium ( Simulium) chamlongi Takaoka & Suzuki, 1984 View in CoL

Simulium ( Simulium) chamlongi Takaoka & Suzuki, 1984: 27 View in CoL –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).