Simulium (Simulium) jeffreyi Takaoka & Davies, 1995

Takaoka, Hiroyuki, Ya’Cob, Zubaidah & Sofian-Azirun, Mohd, 2018, Classification, annotated list and keys for the black flies (Diptera: Simuliidae) of Peninsular Malaysia, Zootaxa 4498 (1), pp. 1-65 : 52

55. Simulium (Simulium) jeffreyi Takaoka & Davies, 1995

Simulium (Simulium) jeffreyi Takaoka & Davies, 1995: 124 –130 (Female, male, pupa and larva).

This species was described from females, males, pupae and larvae collected from Kampung Lebok, 18 km east of Kuala Lumpur (Takaoka and Davies, 1995). It is characterized by the pupal gill with 10 filaments arranged as 2+1+2+1+2+2 from dorsal to ventral, of which the lower five filaments are much more slender than the upper five filaments. This species was also recorded from Vietnam ( Pham, 1999).

The male upper-eye facets were in 14 vertical columns and 14 or 15 horizontal rows in the original description but the number of facets varies intraspecifically: 13 vertical columns and 13 horizontal rows in a population at Kedah, and 11 vertical columns and 13 horizontal rows in a population at Cameron Highlands.

The aquatic stages of this species occur in small to medium-sized streams at low elevations (less than 500 m) in various provinces of Peninsular Malaysia ( Ya’cob et al., 2016a).