Simulium dentistylum Takaoka and Davies 1995

Phasuk, J., Chanpaisaeng, J., Adler, P. H. & Courtney, G. W., 2005, Chromosomal and morphological taxonomy of larvae of Simulium (Gomphostilbia) (Diptera: Simuliidae) in Thailand, Zootaxa 1052, pp. 49-60 : 54

Simulium dentistylum Takaoka and Davies 1995

This species was described based on males, pupae, and mature larvae from West Malaysia ( Takaoka and Davies 1995). The eight short, slender gill filaments are arranged in groups of 2 + 1 + 3 + 2 from dorsal to ventral. The larva is characterized by a deep postgenal cleft ( Fig. 4 D); a marked constriction between abdominal segments IV and V; and both flat, scalelike setae and dark, unbranched or bifurcated setae on the cuticle of abdominal segment V ( Fig. 2 C).

Two of three larvae were analyzed for major landmarks. None of the centromere regions are expanded. The bulge is near the ring of Balbiani in the middle of the IIS arm ( Fig. 1 C).

Figures

FIGURE 1. Idiograms of chromosome arm IIS for 12 Simulium species in subgenus Gomphostilbia from Khao Yai National Park, showing relative locations of Ce, centromere; RB, ring of Balbiani; Bu, bulge; Sh, shoestring. A, Simulium angulistylum. B, S. decuplum. C, S. dentistylum. D, S. gombakense. E, S. siamense. F, S. sp. A. G, S. asakoae. H, S. sheilae. I, S. sp. nr. sheilae. J, S. novemarticulatum. K, S. sp. B. L, S. sp. C.

FIGURE 2. Photographs of setae on abdominal cuticle of Simulium species in subgenus Gomphostilbia. A, Simulium angulistylum. B, S. decuplum. C, S. dentistylum. D, S. siamense. E, S. sp. A. F, S. asakoae. G, S. sheilae. H, S. sp. nr. sheilae. I, S. novemarticulatum. J, S. sp. B.

FIGURE 4. Photographs of postgenal clefts of Simulium species in subgenus Gomphostilbia. A, Simulium asakoae. B, S. gombakense. C, S. sheilae. D, S. dentistylum. E, S. sp. nr. sheilae. F, S. sp. A.