The karyotypes of the thorny catfishes Wertheimeria maculata Steindachner, 1877 and Hassar wilderi Kindle, 1895 (Siluriformes: Doradidae) and their relevance in doradids chromosomal evolution

被引：0

作者：

Eduardo S. Eler

Jorge A. Dergam

Paulo C. Vênere

Lílian C. Paiva

Gabriela A. Miranda

Alessandro A. Oliveira

机构：

[1] Genética,Departamento de Biologia Animal

[2] Conservação e Biologia Evolutiva – Instituto Nacional de Pesquisas da Amazônia,Departamento de Ciências Biológicas e da Saúde

[3] Universidade Federal de Viçosa,undefined

[4] Instituto de Ciências e Letras do Médio Araguaia,undefined

[5] Universidade Federal de Mato Grosso,undefined

来源：

Genetica | 2007年 / 130卷

关键词：

Brazilian coastal basins; Conservation genetics; Cytotaxonomy; South American biodiversity;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

We studied the karyotypes of two doradids, the rare and endangered Wertheimeria maculata and a derived Amazonian species, Hassar wilderi. Cytogenetic characterization was assessed using conventional staining (Giemsa), C-banding, and NOR banding. Both species had 2n = 58 chromosomes but differed in their chromosome formulae, 24 m + 14sm + 8st + 12a for W. maculata and 32 m + 16sm + 10st for H. wilderi. In W. maculata heterochromatin was mainly telomeric, and three chromosomes had a fully heterochromatic arm; in H. wilderi heterochromatin was also predominantly telomeric and evident in many more chromosomes. Hassar wilderi also presented one pair of homologues with a fully heterochromatic arm. In both species, nucleolar organizer regions were restricted to one pair of subtelocentric chromosomes. Assuming a basal position for W. maculata, we hypothesized that underlying conserved diploid and NOR-bearing chromosome numbers, chromosomal evolution in doradids has involved pericentric inversions and an increase of heterochromatic blocks.

引用