Data/hora: 03/06/2024 08:48:31

Provedor de dados: | Genetics and Molecular Biology
País: | Brazil
Título: | Cytogenetic studies of three Lycosidae species   from Argentina (Arachnida, Araneae)
Autores: | Chemisquy,María A.; Gil,Sergio G. Rodríguez; Scioscia,Cristina L.; Mola,Liliana M.
Data: | 2008-12-01
Ano: | 2008
Palavras-chave: | Meiosis; C-banding; Fluorochrome staining; Karyotype; Spiders; "Lycosa"  and Schizocosa.
Resumo: | Cytogenetic studies of the family Lycosidae (Arachnida: Araneae) are scarce. Less than 4% of the described species have been analyzed and the male haploid chromosome numbers ranged from 8+X 1  X  2  to 13+X 1  X  2 . Species formerly classified as  Lycosa  were the most studied ones. Our aim in this work was to perform a comparative analysis of the meiosis in " Lycosa "  erythrognatha  Lucas, " Lycosa "  pampeana  Holmberg and  Schizocosa malitiosa  (Tullgren). We also compared male and female karyotypes and characterized the heterochromatin of " L. "  erythrognatha . The males of the three species had 2n = 22, n = 10+X 1 X 2 , all the chromosomes were telocentric and there was generally a single chiasma per bivalent. In " Lycosa "  pampeana , which is described cytogenetically for the first time herein, the bivalents and sex chromosomes showed a clustered arrangement at prometaphase I. The comparison of the male/female karyotypes (2n = 22/24) of " Lycosa "  erythrognatha  revealed that the sex chromosomes were the largest of the complement and that the autosomes decreased gradually in size. The analysis of the amount, composition and distribution of heterochromatin with C-banding and staining with DAPI- and CMA 3  - showed that " Lycosa "  erythrognatha  had little GC-rich heterochromatin in the pericentromeric region of all chromosomes. In addition, the actual occurrence of the genus  Lycosa  in the Southern Hemisphere is discussed.
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000500010
Editor: | Sociedade Brasileira de Genética
Relação: | 10.1590/S1415-47572008005000022
Formato: | text/html
Fonte: | Genetics and Molecular Biology  v.31 n.4 2008
Fonte: | info:eu-repo/semantics/openAccess