Larval salivary gland chromosomes of the blackfly, Simulium (Gomphostilbia) sundaicum (Diptera : Simuliidae) from Java, Indonesia

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  • インドネシア国ジャワ島産ブユ, Simulium (Gomphostilbia) sundaicum 幼虫の唾液腺染色体の観察
  • Larval salivary gland chromosomes of th

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Abstract

Polytene chromosome study of the Oriental Simuliidae has been only scantily made. Larval salivary gland chromosomes of the blackfly, Simulium (Gomphostilbia) sundaicum Edwards, 1934,from Java, Indonesia, were observed and their standard maps were constructed. This species had three pairs of polytene chromosomes. The chromosome I and II were metacentric and the chromosome III was submetacentric. Each centromere consisted of a large conspicuous heterochromatic segment in all chromosomes. The large heterochromatin was associated with each other in some cells. The nucleolar organizer was located in section 19 of chromosome I. The Balbiani ring, the double bubble and the Parabalbiani ring were situated in section 49C, 48 and 64C of chromosome II, respectively. Five inversions were found, but none of them was sex-related. C-band staining successfully revealed that band of 84A, centromeric of chromosome III, was heterozygously stained, slightly and heavily in males, while homozygously stained, only heavily in females. Then the slightly stained band could be ascribed to Y-chromosomal, and the heavily stained, to X-chromosomal.

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