Description of the female of Simulium (Wallacellum) tuyense Takaoka (Diptera: Simuliidae) from the Philippines.

Simulium (Wallacellum) tuyense Takaoka, one of the 14 Philippine species in the subgenus Wallacellum Takaoka, is a rare species in having the pupal antennal sheath with a row of stout spines on the apex of each protuberance corresponding to flagellomeres 2-9. The female of this species is described for the first time based on specimens from Mindoro, the Philippines. It is characterized by an elongate sensory vesicle, triangular ovipositor valve, genital fork with two projections, and paraproct not produced anteriorly. This species is morphologically indistinguishable in the female, as in the male and pupa, from S. (W.) yonakuniense Takaoka from Yonakuni Island, Japan and Lanyu Island, Taiwan. Taxonomic notes on the female of this species relevant to those of related species are provided. Collection data to validate earlier distribution records of S. (W.) tuyense and S. (W.) suyoense Takaoka from Mindanao are presented.