Cytogenetics in Three Species of Polybetes Simon 1897 From Argentina (Araneae, Sparassidae) I. Karyotype and Chromosome Banding Pattern

Gil, Sergio Gustavo Rodríguez; Merani, María Susana; Scioscia, Cristina Luisa; Mola, Liliana M.

doi:10.1636/s05-69.1

Cited by 13 publications

(16 citation statements)

References 14 publications

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“…In entelegyne spiders, CH is recorded in some species of the families Salticidae (Gorlova et al, 1997), Tetragnathidae (Araújo et al, 2005), Sparassidae (Rowell, 1985;Rodríguez-Gil et al, 2007), Agelenidae (Král, 2007), and Lycosidae (this work, Table 2). Entelegyne spiders have centromeric CH and sometimes a tiny telomeric block on several chromosomes.…”

Section: Discussionmentioning

confidence: 53%

“…Only centromeric CH, without detectable distal blocks, is known for lycosids (see Table 2 for references). This pattern in the distribution of CH is believed to be the ancestral type for spiders (Rodríguez-Gil et al, 2007). Genera Arctosa, Tricca, and Xerolycosa have only centromeric CH.…”

Section: Discussionmentioning

confidence: 87%

“…The sex chromosomes in the species investigated had the same distribution and amount of heterochromatin as the autosomes. According to the data presented, sex chromosomes of wolf spiders consist mostly of euchromatin and are heterochromatinized facultatively at male meiosis as in other spiders (Datta & Chatterjee, 1989;Král, 2007;Rodríguez-Gil et al, 2007). Predominance of CH in sex chromosomes has been reported only in a few spiders, namely three species of lycosids.…”

Section: Discussionmentioning

confidence: 92%

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Karyotypes of central European spiders of the genera Arctosa, Tricca, and Xerolycosa (Araneae: Lycosidae)

Dolejš¹,

Kořínková²,

Musilová³

et al. 2011

Eur. J. Entomol.

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Abstract. The aim of this study was to characterize karyotypes of central European spiders of the genera Arctosa, Tricca, and Xerolycosa (Lycosidae) with respect to the diploid chromosome number, chromosome morphology, and sex chromosomes. Karyotype data are reported for eleven species, six of them for the first time. For selected species the pattern in the distributions of the constitutive heterochromatin and the nucleolar organizer regions (NORs) was determined. The silver staining technique for detecting NORs of lycosid spiders was standardized. The male karyotype consisted of 2n = 28 (Arctosa and Tricca) or 2n = 22 (Xerolycosa) acrocentric chromosomes. The sex chromosome system was X1X20 in all species. The sex chromosomes of T. lutetiana and X. nemoralis showed unusual behaviour during late diplotene, namely temporary extension due to decondensation. C-banding technique revealed a small amount of constitutive heterochromatin at the centromeric region of the chromosomes. Two pairs of autosomes bore terminal NORs. Differences in karyotypes among Arctosa species indicate that the evolution of the karyotype in this genus involved autosome translocations and size changes in the sex chromosomes. Based on published results and those recorded in this study it is suggested that the ancestral male karyotype of the superfamily Lycosoidea consisted of 28 acrocentric chromosomes.

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Section: Discussionmentioning

confidence: 53%

Section: Discussionmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 92%

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Karyotypes of central European spiders of the genera Arctosa, Tricca, and Xerolycosa (Araneae: Lycosidae)

Dolejš¹,

Kořínková²,

Musilová³

et al. 2011

Eur. J. Entomol.

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“…The number and location of NORs were only established, for example, in approximately 30 species of Araneae (Král et al, 2006;Král, 2007;Oliveira et al, 2007;Rodríguez-Gil et al, 2007;Araujo et al, 2008;Stávale et al, 2010Stávale et al, , 2011Dolejš et al, 2011;Král et al, 2011), 17 species of Scorpiones (Schneider et al, 2009a,b;Schneider and Cella, 2010), 3 species of Opiliones (Gorlov and Tsurusaki, 2000;Oliveira et al, 2006;Schneider et al, 2008;Mattos et al, 2013), and two species of Palpigradi (Král et al, 2008). In almost all these species, the NORs were only identified through the use of silver impregnation; however, in an overview of the NOR distribution in Coleoptera, Schneider et al (2007) showed that the results were usually coincident when the chromosomes were examined with both silver impregnation and FISH technique.…”

Section: Discussionmentioning

confidence: 99%

Chromosomal characteristics of a Brazilian whip spider (Amblypygi) and evolutionary relationships with other arachnid orders

Paula-Neto

Araujo²,

Carvalho³

et al. 2013

Genet. Mol. Res.

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ABSTRACT. We analyzed mitotic and meiotic cells of a Brazilian amblypygid, Heterophrynus longicornis, using conventional and molecular cytogenetic techniques (Giemsa staining, C-banding, Ag-NOR, and FISH with rDNA probe). This is the first study that focuses solely on amblypygid chromosomes; it was undertaken to add data on cytogenetic knowledge of this group and contribute to the understanding of chromosome evolution in the Arachnida. We found 2n = 66 for male and female individuals, monocentric chromosomes, and absence of morphologically differentiated sex chromosomes. C-banding showed heterochromatin in the pericentromeric region of most chromosomes. Mitotic and meiotic nuclei submitted to Chromosomal characteristics of a Brazilian whip spider silver impregnation and FISH revealed, respectively, Ag-NORs and ribosomal genes in the terminal region of two chromosome pairs. Most chromosome features that we observed in H. longicornis are shared with species of other arachnid orders; however, the absence of morphologically differentiated sex chromosomes in amblypygid contrasts with the remarkable variety of sex chromosome systems recorded for the Araneae. Consequently, we conclude that analysis of species of the Tetrapulmonata clade is useful for understanding the trends of sex chromosome evolution in this arachnid group.

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“…Within Entelegynae the analysis of this specific chromosome region was performed only in certain species, e.g., one species of Lycosidae, Nephillidae, Oxyopidae, and three species of Sparassidae, which revealed NORs on the terminal region of one, two, or up to three autosomal pairs (Wise, 1983;Barrion et al, 1989;Araujo et al, 2005;Rodríguez-Gil et al, 2007). Although Hamataliwa sp and O. salticus differed with regard to the number of carrier pairs of NOR, these two species always presented argentophilic material on autosomal chromosomes.…”

Section: Discussionmentioning

confidence: 99%

Chromosomal characteristics and karyotype evolution of Oxyopidae spiders (Araneae, Entelegynae)

Stávale¹,

Schneider²,

Brescovit³

et al. 2011

Genet. Mol. Res.

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ABSTRACT. We made a cytogenetic analysis of four species of Oxyopidae and compared it with the karyotype data of all species of this family. In Hamataliwa sp, the mitotic cells showed 2n♂ = 26+X 1 X 2 and telocentric chromosomes. The 2n♂ = 28, which has been described for only one oxyopid spider, is the highest diploid number reported for this family. Peucetia species exhibited distinct karyotype characteristics, i.e., 2n♂ = 20+X 1 X 2 in P. flava and 2n♂ = 20+X in P. rubrolineata, revealing interspecific chromosome variability within this genus. However, both Peucetia species exhibited telocentric chromosomes. The most unexpected karyotype was encountered in Oxyopes salticus, which presented 2n♂ = 10+X in most individuals and a predominance of biarmed chromosomes. Additionally, one male of the sample of O. salticus was heterozygous for a centric fusion that originated the first chromosomal pair and exhibited one supernumerary chromosome in some cells. Testicular nuclei of Hamataliwa sp and O. salticus revealed NORs on autosomal pairs, after silver impregnation. The majority of Oxyopidae spiders have their karyotype differentiated by both reduction in diploid Karyotype evolution of Oxyopidae spiders number chromosome number and change of the sex chromosome system to X type; however, certain species retain the ancestral chromosome constitution 2n = 26+X1X2. The most remarkable karyotype differentiation occurred in O. salticus studied here, which showed the lowest diploid number ever observed in Oxyopidae and the second lowest registered for Entelegynae spiders.

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Cytogenetics in Three Species of Polybetes Simon 1897 From Argentina (Araneae, Sparassidae) I. Karyotype and Chromosome Banding Pattern

Cited by 13 publications

References 14 publications

Karyotypes of central European spiders of the genera Arctosa, Tricca, and Xerolycosa (Araneae: Lycosidae)

Karyotypes of central European spiders of the genera Arctosa, Tricca, and Xerolycosa (Araneae: Lycosidae)

Chromosomal characteristics of a Brazilian whip spider (Amblypygi) and evolutionary relationships with other arachnid orders

Chromosomal characteristics and karyotype evolution of Oxyopidae spiders (Araneae, Entelegynae)

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