Karyotypic Study of Male Predaceos Spear-headed Katydid (Palaeoagraecia brunnea) and Male Bluish-green Rice Grasshopper (Hieroglyphus banian) in Northern Thailand

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อิสสระ ปะทะวัง

Abstract

This study analyzed the karyotype and idiogram of male predaceos spear-headed katydid,  Palaeoagraecia brunnea (Ingrisch, 1998), and male bluish-green rice grasshopper, Hieroglyphus banian (Fabricius, 1798), in Northern Thailand. Grasshoppers were collected from Lamphun and Chiang Mai Provinces. The mitotic chromosomes were directly prepared from gut tissue and male testis tissue by colchicine-hypotonic-fixation techniques. Then stained by conventional staining using 20% (v/v) Giemsa working solution. Chromosomes were observed under compound light microscope (1,000 times). The results showed that the diploid chromosome number of the male Palaeoagraecia brunnea was 2n = 13 including 12 autosomes and 1 X chromosome. The karyotype formula of the male Palaeoagraecia brunnea was deduced as: 2n (13) = Lm12 + X (Lm) chromosome. The diploid chromosome number of the male Hieroglyphus banian was 2n = 23 including 22 autosomes and 1 X chromosome. The karyotype formula of the male Hieroglyphus banian was deduced as: 2n (23) = Lt8 + Mt6 + St8 + X (Lt) chromosome.

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References

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