Simulium (Simulium) nodosum Puri, 1933

Simulium (Simulium) nodosum: Puri, 1933: 813 – 817 (Female, male and pupa); Lewis, 1974: 34 – 37 (Female, male, pupa and mature larva); Takaoka & Suzuki, 1984: 33 –34 (Pupa and mature larva).

Specimens examined. Four pupae and three pupal exuviae collected from a stream (width 1.5–2.0 m, depth 7–15 cm, water temperature 23˚C, exposed to the sun, altitude 18 m, 16˚15’58.207” N/107˚42’19.847” E), moderately flowing in a grass field, Thua Thien Hue Province, central Vietnam, 22-II-2014, by H. Takaoka, M. Sofian-Azirun, Z. Ya’cob, C.D. Chen & K.W. Lau; two females, one male, five mature larvae collected from a slow-flowing stream (width 3–6 m, water temperature 20.0˚C, exposed to the sun, altitude 1,439 m, 12˚08’32.409” N/ 108˚38’58.318” E), 55 km from Dalat, Da Chais, Lac Duong District, Lam Dong Province, southern Vietnam, 25- IV-2014, by H. Takaoka, M. Sofian-Azirun, Z. Ya’cob, C.D. Chen & K.W. Lau.

Distribution. India, China, Thailand, and Vietnam.

Remarks. This is an exceptional species among species of the S. nobile species-group in that it has a simple female claw and three inflated tubular pupal gill filaments (Puri 1933).