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Larval polytene chromosomes of three Japanese blackfly species (Diptera : Simuliidae)

Posted by on November 3, 2011

Larval polytene chromosomes of three Japanese blackfly species (Diptera : Simuliidae)

Medical entomology and zoology 47(1), 47-54, 1996 The Japan Society of Medical Entomology and Zoology

Hadi,Upik Kesumawati, Hiroyuki Takaoka & Chiharu Aoki

Standard maps of larval salivary gland polytene chromosomes of three Japanese blackfly species : i.e., Simulium bidentatum (Shiraki, 1935), S. aokii (Takahasi, 1941) and S. arakawae Matsumura, 1915,were presented. All the three species had three paired chromosomes (2n=6) and showed other main characteristics in common, such as a Balbiani ring, a double bubble, a parabalbiani ring and a nucleolar organizer on the same arm of the same chromosome. However, their precise locations were different among the species. All species had prominent centromeres, the banding patterns of which were different among them. In S. bidentatum and S. aokii polymorphic inversions were found in low frequencies, and B-chromosomes were also detected. Any sex chromosomes or sex-linked segments could not be detected.

Full paper in PDF: Larval polytene chromosomes of three Japanese blackfly species (Diptera Simuliidae)

 

Title in Japanese: 日本産ブユ 3 種の幼虫唾液腺染色体

Simulium bidentatum (キアシツメトゲブユ) S. aokii (アオキツメトゲブユ)およびS. arakawae (ヒメアシマダラブユ)の幼虫の唾液腺染色体を観察し, 標準染色体図を作成した。3種とも染色体の基本数はn=3で, Balbiani ring, double bubble, Parabalbiani ringや仁形成部などの主な特徴は3種のブユで同一染色体の同じ腕に見られたが, 正確な位置は種ごとに違いが認められた。中心体は3種とも顕著であったが, ヘテロクロマチンの成す縞模様は種別に異なっていた。逆位はキアシツメトゲブユとアオキツメトゲブユに低率で見いだされた。B染色体もこの2種に見出ださ れた。性を決定する染色体の同定は出来なかった。

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