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首页> 外文期刊>Caryologia: Giornale de Citologia, Citosistematica e Citogenetica >Chromosomal similarity between two species of Apteronotus albifrons complex (Apteronotidae-Gymnotiformes) implications in cytotaxonomy and karyotypic evolution
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Chromosomal similarity between two species of Apteronotus albifrons complex (Apteronotidae-Gymnotiformes) implications in cytotaxonomy and karyotypic evolution

机译：两种ApteronoTus albifrons复合物（Apteronotidae-geamNotiformes）之间的染色体相似性（Apteronotidae-gymnotiformes）在细胞间和核型进化中的影响

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摘要

Apteronotidae is one of the oldest families from the order Gymnotiformes, and is composed of 94 species that can be found from Panama to northern Argentina. Some groups such as Apteronotus present taxonomic problems, mainly related to interspecific morphological similarity. In the present study, two species belonging to Apteronotus albifrons complex from different hydrographic basins were cytogenetically analyzed in order to define chromosomal structure and propose evolutionary trends for the group. Apteronotus albifrons presented 2n = 24 (14m + 2sm + 8a) FN = 40 and Apteronotus caudimaculosus 2n = 24 (12m + 2sm + 10a) FN = 38; this difference in karyotypic formulae can be explained by pericentric inversion involving metacentric and acrocentric chromosomes. The karyotypic similarity between these two species indicates a chromosomal diversification, characterized by changes in karyotype formulae, which were considered an excellent cytotaxonomic marker to discriminate A. caudimaculosus of other populations of Apteronotus albifrons complex.
机译：Apteronotidae是来自Gymnotiformes的最古老的家庭之一，由94种可以从巴拿马到阿根廷北部的物种组成。某些群体如apteronootus目前的分类问题，主要是与三种形态相似性相关的。在本研究中，属于来自不同水文盆地的ApteronoTus albifrons复合物的两种物种被细胞遗传学分析，以便定义染色体结构并提出该组的进化趋势。呈现2N = 24（14m + 2sm + 8a）Fn = 40和apteronootus的Albifrons 2n = 24（12m + 2sm + 10a）fn = 38;核型公式的这种差异可以通过涉及偏心和上注染色体的泌乳反演来解释。这两种物种之间的核型相似性表明了染色体多样化，其特征在于核型公式的变化，其被认为是一种优异的细胞甘油霉病，以区分A.Albifrons复合物的其他群体的尾蚴。

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