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Larval salivary gland chromosomes of the blackfly, Simulium (Simulium) eximium (Diptera : Simuliidae) from Java and Sumatra, Indonesia

Posted by on November 3, 2011

Larval salivary gland chromosomes of the blackfly, Simulium (Simulium) eximium (Diptera: Simuliidae) from Java and Sumatra, Indonesia

Medical Entomology and Zoology 47(2), 139-144, 1996, The Japan Society of Medical Entomology and Zoology.

Hadi,Upik Kesumawati, Hiroyuki Takaoka, Kashiko Kondo & Hirohisa Hirai

Larval polytene chromosome banding patterns of Simulium (Simulium) eximium de Meijere, 1913 collected from West Java and Sumatra in Indonesia were observed and a standard map was presented. This species had three chromosome pairs which were numbered I-III in decreasing order of size. Each centromere of all chromosomes was distinguished by an expanded region with heterochromatin. A haplotype involving two distinctive heterochromatic bands in the centromere (21A) and section 20B of the chromosome I was heterozygous in most of the males from the population of Puncak (West Java) and appeared to be sex-linked. The differences in chromosomal polymorphism, coupled with those in sex-related banding, suggest that two sibling species exist in the S. (S.) eximium morphospecies, one in Puncak (West Java) and the other in Danau Ranau (South Sumatra).

 

Full Paper in PDF: Larval salivary gland chromosomes of the blackfly, Simulium (Simulium) eximium (Diptera Simuliidae) from Java and Sumatra, Indonesia

 

Title in Japanese: インドネシア国ジャワおよびスマトラ島産ブユ, Simulium (Simulium) eximium における幼虫の唾腺染色体および姉妹種分化

インドネシア国ジャワ島プンチャクおよびスマトラ島ダナウラナウに生息するSimulium (Simulium) eximiumを細胞遺伝学的に解析した。幼虫の唾腺染色体の標準マップを作製し, 染色体変異の分析を行った。本種の唾液腺染色体は, 相同染色体が対合した3本(2n=6)から成り, ヘテロクロマチンに富む明瞭な動原体部を有していた。ジャワ島プンチャク集団の雄だけに, 第一染色体の動原体(21A)および近接バンド20Bに増幅したC-バンドのヘテロ接合が観察された。この2つの部位およびその近傍では染色体は非対合で あった。このことから, これら2つの明らかな染色体変異を含むハプロタイプは, 雄性決定因子と密接に連鎖しているものと推測される。Y染色体領域分化の有無と集団固有の逆位多型から, ジャワ島プンチャク集団およびスマトラ島ダナウラナウ集団は, 地理的にも隔離されており姉妹種の可能性が示唆された。

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