MACNBR   00242
MUSEO ARGENTINO DE CIENCIAS NATURALES "BERNARDINO RIVADAVIA"
Unidad Ejecutora - UE
artículos
Título:
Cytogenetic studies in three Lycosidae species from Argentina (Arachnida: Araneae)
Autor/es:
CHEMISQUY MARÍA AMELIA; RODRÍGUEZ-GIL SERGIO GUSTAVO; SCIOSCIA CRISTINA LUISA; MOLA LILIANA MARÍA
Revista:
GENETICS AND MOLECULAR BIOLOGY
Referencias:
Año: 2008 vol. 31 p. 857 - 867
ISSN:
1415-4757
Resumen:
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+X1X2 to 13+X1X2. Species formerly
classified as Lycosawere the most studied ones. Our aim in this work was to perform a comparative analysis of the
meiosis in " Lycosa" erythrognathaLucas, " Lycosa" pampeanaHolmberg 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+X1X2, 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" erythrognatharevealed 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 CMA3- showed that " Lycosa" erythrognathahad
little GC-rich heterochromatin in the pericentromeric region of all chromosomes. In addition, the actual occurrence of
the genus Lycosain the Southern Hemisphere is discussed.1X2 to 13+X1X2. Species formerly
classified as Lycosawere the most studied ones. Our aim in this work was to perform a comparative analysis of the
meiosis in " Lycosa" erythrognathaLucas, " Lycosa" pampeanaHolmberg 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+X1X2, 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" erythrognatharevealed 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 CMA3- showed that " Lycosa" erythrognathahad
little GC-rich heterochromatin in the pericentromeric region of all chromosomes. In addition, the actual occurrence of
the genus Lycosain the Southern Hemisphere is discussed.1X2, 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" erythrognatharevealed 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 CMA3- showed that " Lycosa" erythrognathahad
little GC-rich heterochromatin in the pericentromeric region of all chromosomes. In addition, the actual occurrence of
the genus Lycosain the Southern Hemisphere is discussed.3- showed that " Lycosa" erythrognathahad
little GC-rich heterochromatin in the pericentromeric region of all chromosomes. In addition, the actual occurrence of
the genus Lycosain the Southern Hemisphere is discussed.