Publication: Larval polytene chromosomes of black flies (Simulium) from Thailand: I. Comparison among five species in the subgenus Gomphostilbia Enderlein
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Issued Date
2003-05-01
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ISSN
00166707
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2-s2.0-0242416528
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Mahidol University
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SCOPUS
Bibliographic Citation
Genetica. Vol.118, No.1 (2003), 69-81
Suggested Citation
Chaliow Kuvangkadilok, Chainarong Boonkemtong, Suwannee Phayuhasena, Visut Baimai Larval polytene chromosomes of black flies (Simulium) from Thailand: I. Comparison among five species in the subgenus Gomphostilbia Enderlein. Genetica. Vol.118, No.1 (2003), 69-81. doi:10.1023/A:1022909018987 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/20636
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Title
Larval polytene chromosomes of black flies (Simulium) from Thailand: I. Comparison among five species in the subgenus Gomphostilbia Enderlein
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Abstract
Larval polytene chromosome maps of Simulium (G.) asakoae and S. (G.) sp. g in the ceylonicum-group and S. (G.) angulistylum, S. (G.) decuplum and S. (G.) siamense in the batoense-group of the subgenus Gomphostilbia from Thailand are presented. These species have three pairs of chromosomes (2n = 6). Light stained centromeric bands were observed in the chromosomes of S. (G.) asakoae, S. (G.) sp. g, S. (G.) decuplum and S. (G.) siamense, whereas heavy dark centromeric bands were present in S. (G.) angulistylum. The best distinguishing character of Simulium species in the subgenus Gomphostilbia is the position of the nucleolar organizer in the short arm of chromosome I. The Ring of Balbiani and the double bubble are located in chromosome arm IIS in all species except for S. (G.) angulistylum, which showed these cytological markers in chromosome arm IIIS. A low chromosomal polymorphism was recorded in all species except for S. (G.) sp. g, which exhibited a standard polytene chromosome. Inversion polymorphisms found in this study conformed to Hardy-Weinberg equilibrium and were not associated with sex. These species have different specific markers and banding patterns although homologous banding sequences were found in chromosome arm IIS in S. (G.) asakoae, S. (G.) sp. g, S. (G.) decuplum and S. (G.) siamense and chromosome arm IIIS in S. (G.) angulistylum. Our results showed no evidence of a sibling species complex within any taxon.