Simulium decuplum 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 : 53

Simulium decuplum Takaoka and Davies 1995

Simulium decuplum was described from the female, pupa, and mature larva from West Malaysia ( Takaoka and Davies 1995). The 10 gill filaments are slender, short, and arranged in groups of 4 + 4 + 2 from dorsal to ventral. The larva has a deep postgenal cleft almost reaching the posterior border of the hypostoma and abdominal cuticle bearing dark setae with 10–14 branches ( Fig. 2 B).

The chromosomes of this species were first described by Kuvangkadilok et al. (2003). In the present study, 13 of 40 larvae were analyzed for major landmarks. The centromere regions are not expanded. The IIS arm has the ring of Balbiani near the bulge and closer to the centromere than to the end of the chromosome ( Fig. 1 B).

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.