Universidade Federal do Paraná, Programa de Pós-Graduação em Genética, Centro Politécnico, Jardim das Américas, 81531-990 Curitiba - PR, Brazil.
Micron. 2010 Apr;41(3):193-7. doi: 10.1016/j.micron.2009.11.004. Epub 2009 Nov 24.
The family Ariidae comprises approximately 130 catfish species on both warm-temperate and tropical continental shelves around the world. The systematics of the group is problematic, with several misidentification problems. In order to better understand the evolutionary relationships in the family, the present study used a cytogenetic approach to characterize two populations of Genidens genidens and two populations of Aspistor luniscutis from the southern coast of Brazil using conventional techniques and fluorescent in situ hybridization with 18S rDNA probes. The two species had the same diploid number (2n = 56), high fundamental numbers and similar banding patterns, thereby corroborating the karyotypic homogeneity proposed for the group. Single nucleolus organizer regions (NORs) were found in the genus Genidens and multiple NORs were found in Aspistor, which are considered an important cytotaxonomic marker for this genus. Karyotypic evolution trends were hypothesized, providing a better understanding of the karyotype diversity and chromosome evolution processes.
棘鳍鲶科包括大约 130 种分布于世界暖温带和热带大陆架的鲶形目鱼类。该科的系统分类存在问题，存在一些误鉴定的情况。为了更好地了解该科的进化关系，本研究使用细胞遗传学方法，利用常规技术和 18S rDNA 探针的荧光原位杂交，对来自巴西南部的两个 Genidens genidens 种群和两个 Aspistor luniscutis 种群进行了特征描述。这两个物种具有相同的二倍体数（2n = 56）、高基数和相似的带型模式，从而证实了该组提出的核型同质性。在 Genidens 属中发现了单个核仁组织区（NORs），而在 Aspistor 中发现了多个 NORs，这被认为是该属的一个重要细胞分类学标记。假设了核型进化趋势，从而更好地理解了染色体多样性和染色体进化过程。
