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Cytogenetic analysis of two locariid species (Teleostei Siluriformes) from Iguatemi River (Parana River drainage) in Brazil

机译:巴西伊瓜特米河(帕拉纳河排水)的两种蝗虫物种(TeleosteiSiluriformes)的细胞遗传学分析

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摘要

Fishes of the Loricariidae family, known as “cascudos”, constitute an endemic group in Neotropical freshwaters. In this study, were cytogenetically examined two species of Loricariidae (Pterygoplichthys anisitsi Eigenmann & Kennedy, 1903 and Farlowella amazonum (Günther, 1864) belonging to Hypostominae and Loricariinae subfamilies respectively) from Iguatemi River. Our study provide the first description regarding C-band and fluorochromic analysis in Farlowella amazonum. In Farlowella amazonum, diploid number was 58 chromosomes, with single Ag-NOR and heterochromatic blocks in centromeric regions of some chromosomes and large subtelomeric blocks were evidenced on the long arm of the pair 27, being this region CMA3+/DAPI-. The Pterygoplichthys anisitsi showed diploid number equal 52 chromosomes, with single Ag-NOR and heterochromatic blocks in centromeric and telomeric regions of some chromosomes and conspicuous large telomeric blocks on the long arm of the pair 10, being this region CMA3+/DAPI-. The results show that karyotype formula is nonconservative in Pterygoplichthys anisitsi and Farlowella amazonum.
机译:Loricariidae科的鱼类被称为“ cascudos”,是新热带淡水中的一种特有种群。在这项研究中,用细胞遗传学方法检查了伊瓜特米河的两个鸢尾科(Pterygoplichthys anisitsi Eigenmann&Kennedy,1903年和Farlowella amazonum(Günther,1864年),分别属于Hypostominae和Loricariinae亚科。我们的研究首次对 Farlowella amazonum < / em> 。在 Farlowella amazonum 中,二倍体数目为58条染色体,在某些染色体的着丝粒区域中具有单个Ag-NOR和异色块,在该对27的长臂上证实了大的亚端粒块,即该区域CMA3 + / DAPI - 翼翅目 anisitsi 显示为二倍体数目等于52条染色体,在某些染色体的着丝粒和端粒区域中有单个Ag-NOR和异色块,而在10对的长臂上有明显的大端粒块,即CMA3 + / DAPI < sup>-。结果表明, 翼手龙 anisitsi Farlowella 亚马逊

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