Cytogenetics in three species of Polybetes Simon 1897 from Argentina (Araneae, sparassidae) I. Karyotype and chromosome banding pattern

Species of Polybetes are known exclusively from South America. Currently there are 13 described species, 9 occurring in Argentina. Cytogenetic studies in spiders are scarce; the cytogenetics of only about 1% of nearly 39,500 described species are known. Within the Sparassidae, 38 species out of 1,00...

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Autores principales: Rodríguez-Gil, S.G., Merani, M.S., Scioscia, C.L., Mola, L.M.
Formato: JOUR
Materias:
Chromosome number
Heterochromatin
Nucleolus-organizing regions
Telocentric chromosomes
Araneae
Heteropoda venatoria
Olios
Sparassidae
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_01618202_v35_n2_p227_RodriguezGil
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_01618202_v35_n2_p227_RodriguezGil2023-10-03T15:01:23Z Cytogenetics in three species of Polybetes Simon 1897 from Argentina (Araneae, sparassidae) I. Karyotype and chromosome banding pattern Rodríguez-Gil, S.G. Merani, M.S. Scioscia, C.L. Mola, L.M. Chromosome number Heterochromatin Nucleolus-organizing regions Telocentric chromosomes Araneae Heteropoda venatoria Olios Sparassidae Species of Polybetes are known exclusively from South America. Currently there are 13 described species, 9 occurring in Argentina. Cytogenetic studies in spiders are scarce; the cytogenetics of only about 1% of nearly 39,500 described species are known. Within the Sparassidae, 38 species out of 1,009 (< 4%) have been cytogenetically analyzed; the most frequent chromosome number is 2n = 43/46 (male/female), n = 20 + X1X2X 3, present in almost half of the species studied. Female diploid chromosome number is only known for four species: Heteropoda venatoria (Linnaeus 1767) (2n = 44); Pediana regina (L. Koch 1875), Isopeda sp. and Olios sp. (2n = 46). Within the genus Polybetes, only P. pythagoricus (Holmberg 1875) had been previuosly cytogenetically analyzed. In the present work, the karyotype, heterochromatin content and distribution, and silver stained nucleolus-organizer regions of P. pythagoricus, P. rapidus (Keyserling 1880) and P. punctulatus Mello-Leitão 1944 are described and compared. In P. pythagoricus the identification of the chromosome pairs by means of G-banding is also performed. Females of the three species show a chromosome complement of 44 telocentric chromosomes, with a similar karyotype. Males of P. pythagoricus show 42 telocentric chromosomes, the two sex chromosomes being the largest and of different size. In the three species, two pairs of telomeric NORs and small pericentromeric positive C-bands in all chromosomes were detected. This C-banding pattern seems to be characteristic of spiders. Comparative analysis of chromosome complements in Sparassidae indicates that 2n = 42/44 (X 1X20/X1X1X2X 2) (male/female) may represent the ancestral karyotype for Polybetes. Fil:Rodríguez-Gil, S.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Scioscia, C.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Mola, L.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_01618202_v35_n2_p227_RodriguezGil
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Chromosome number
Heterochromatin
Nucleolus-organizing regions
Telocentric chromosomes
Araneae
Heteropoda venatoria
Olios
Sparassidae
spellingShingle Chromosome number
Heterochromatin
Nucleolus-organizing regions
Telocentric chromosomes
Araneae
Heteropoda venatoria
Olios
Sparassidae
Rodríguez-Gil, S.G.
Merani, M.S.
Scioscia, C.L.
Mola, L.M.
Cytogenetics in three species of Polybetes Simon 1897 from Argentina (Araneae, sparassidae) I. Karyotype and chromosome banding pattern
topic_facet Chromosome number
Heterochromatin
Nucleolus-organizing regions
Telocentric chromosomes
Araneae
Heteropoda venatoria
Olios
Sparassidae
description Species of Polybetes are known exclusively from South America. Currently there are 13 described species, 9 occurring in Argentina. Cytogenetic studies in spiders are scarce; the cytogenetics of only about 1% of nearly 39,500 described species are known. Within the Sparassidae, 38 species out of 1,009 (< 4%) have been cytogenetically analyzed; the most frequent chromosome number is 2n = 43/46 (male/female), n = 20 + X1X2X 3, present in almost half of the species studied. Female diploid chromosome number is only known for four species: Heteropoda venatoria (Linnaeus 1767) (2n = 44); Pediana regina (L. Koch 1875), Isopeda sp. and Olios sp. (2n = 46). Within the genus Polybetes, only P. pythagoricus (Holmberg 1875) had been previuosly cytogenetically analyzed. In the present work, the karyotype, heterochromatin content and distribution, and silver stained nucleolus-organizer regions of P. pythagoricus, P. rapidus (Keyserling 1880) and P. punctulatus Mello-Leitão 1944 are described and compared. In P. pythagoricus the identification of the chromosome pairs by means of G-banding is also performed. Females of the three species show a chromosome complement of 44 telocentric chromosomes, with a similar karyotype. Males of P. pythagoricus show 42 telocentric chromosomes, the two sex chromosomes being the largest and of different size. In the three species, two pairs of telomeric NORs and small pericentromeric positive C-bands in all chromosomes were detected. This C-banding pattern seems to be characteristic of spiders. Comparative analysis of chromosome complements in Sparassidae indicates that 2n = 42/44 (X 1X20/X1X1X2X 2) (male/female) may represent the ancestral karyotype for Polybetes.
format JOUR
author Rodríguez-Gil, S.G.
Merani, M.S.
Scioscia, C.L.
Mola, L.M.
author_facet Rodríguez-Gil, S.G.
Merani, M.S.
Scioscia, C.L.
Mola, L.M.
author_sort Rodríguez-Gil, S.G.
title Cytogenetics in three species of Polybetes Simon 1897 from Argentina (Araneae, sparassidae) I. Karyotype and chromosome banding pattern
title_short Cytogenetics in three species of Polybetes Simon 1897 from Argentina (Araneae, sparassidae) I. Karyotype and chromosome banding pattern
title_full Cytogenetics in three species of Polybetes Simon 1897 from Argentina (Araneae, sparassidae) I. Karyotype and chromosome banding pattern
title_fullStr Cytogenetics in three species of Polybetes Simon 1897 from Argentina (Araneae, sparassidae) I. Karyotype and chromosome banding pattern
title_full_unstemmed Cytogenetics in three species of Polybetes Simon 1897 from Argentina (Araneae, sparassidae) I. Karyotype and chromosome banding pattern
title_sort cytogenetics in three species of polybetes simon 1897 from argentina (araneae, sparassidae) i. karyotype and chromosome banding pattern
url http://hdl.handle.net/20.500.12110/paper_01618202_v35_n2_p227_RodriguezGil
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