Chromosome numbers of Coleoptera from Argentina

Vidal, O.R

doi:10.1007/bf00122910

Cited by 41 publications

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“…immaculata, Cha. sexpunctata, D. cruciata) that had already been cytogenetically studied and are being analyzed in this work, exhibit karyotype characteristics similar to those previously described (Vidal, 1984;Virkki et al, 1992;De Julio et al, 2010). The exception is A. inedita which has 2n = 38 + Xy p , differing from the 2n = 40 + Xy p recorded by De Julio et al (2010) for a population from Rio Claro, state of São Paulo, Brazil.…”

Section: Discussionsupporting

confidence: 78%

“…The tribe Goniocheniini, with fi ve genera and 30 taxonomically recognized species, has not yet been tested to confi rm its supposed monophyly (Chaboo, 2007). The available results for two species of this tribe, Chlamydocassis metallica (Vidal, 1984) and Chl. cribripennis, revealed similarities in the diploid number 2n = 32 and Xy p sex chromosome system.…”

Section: Discussionmentioning

confidence: 99%

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Comparative cytogenetic analysis in 13 tortoise beetles (Coleoptera: Chrysomelidae: Cassidinae) from Brazil

Lopes¹,

Fernandes²,

Schneider³

2016

Eur. J. Entomol.

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ISSN (online): 1802-8829http://www.eje.cz fi nding was corroborated by a phylogenetic study using molecular data (Gómez-Zurita et al., 2008).Cytogenetically, only 117 Cassidinae species belonging to 13 tribes have been investigated to date (for revision see De Julio et al., 2010). The tortoise beetles are considered as a group with conserved karyotype, in which approximately 52% of the analyzed species showed 2n = 16 + Xy p , with metacentric and/or submetacentric chromosomes (De Julio et al., 2010). However, cytogenetic records also demonstrated that the diploid numbers can range from 2n = 16 to 2n = 51, as well the sex chromosome systems, which can be either simple -Xy p , X0, Xy, Xy c , Xy r , neoXY, or multiple -Xyy p , X p neoXneoY p , X p neoXneoy p , neoX p neoyy p , neoX p1 neoX p2 neoXneoy p , neoX p1 neoX p2 neoXneoy, X p1 X p2 -neoXneoy (for review see De Julio et al., 2010). These variations in the diploid number and sex chromosome systems are more or less frequent according to the tribe considered. In Cassidini and Mesomphaliini, 44% and 100% Abstract. In the present work, we have characterized the chromosomes of 13 Cassidinae beetles, belonging to four tribes, the broad aim being to increase the cytogenetic data and establish the mechanisms involved in chromosome evolution of this subfamily, which appear to be conserved karyotypically, i.e. 2n = 16 + Xy p . The analysis of mitotic and meiotic cells revealed a high diversity of diploid numbers (2n = 18, 2n = 22, 2n = 26, 2n = 32, 2n = 36, 2n = 40, 2n = 42), and the presence of sex chromosome system of the Xy p type in most species, with the exception of two representatives that exhibited Xy r and XY systems. C-banding showed constitutive heterochromatin predominantly localized in the pericentromeric region of the chromosomes, but differences regarding the number of chromosomes with positive C-bands, intensity of the blocks, and presence of additional bands in autosomes and/or sex chromosomes were observed among the species investigated. Our data revealed that the karyotype 2n = 16 + Xy p does not occur in all 13 tribes of the Cassidinae characterized cytogenetically, seeming to be only a shared feature among the species of the Cassidini. Variations in the C-band pattern, mainly in closely related species, suggest that the interspecifi c karyotype diversifi cation occurred as a result of changes in the quantity and distribution of constitutive heterochromatin. The occurrence of the Xy p sex chromosome system in the tribe Mesomphaliini, which showed the highest diversity of simple and multiple systems among the coleopteran as a whole, reinforces the view that derived systems originated by chromosome rearrangements involving the Xy p ancestral system.

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Section: Discussionsupporting

confidence: 78%

Section: Discussionmentioning

confidence: 99%

Comparative cytogenetic analysis in 13 tortoise beetles (Coleoptera: Chrysomelidae: Cassidinae) from Brazil

Lopes¹,

Fernandes²,

Schneider³

2016

Eur. J. Entomol.

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“…nigricolis and Che. varians (Stevens, 1906;De Vaio & Postiglioni, 1974;Vidal, 1984;Postiglioni et al, 1990Postiglioni et al, , 1991Virkki et al, 1992;Lopes et al, 2016). On the other hand, Cyr.…”

Section: Discussionunclassified

Chromosome mapping of 28S ribosomal genes in 11 species of Cassidinae (Coleoptera: Chrysomelidae)

Lopes¹,

Fernandes²,

Schneider³

2017

Eur. J. Entomol.

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“…An idea of the extent of such variation is given by the karyotypic variability described in the Disonycha species D. spilotracheta (2n = 29 (13II+X 1 y+X 2 ), Virkki, 1988b), D. bicarinata (2n = 64 (30II+X 1 Y+X 2 X 3 ) Virkki, 1988b), D. nigrita (2n = 34 (16II+X+x) Virkki, 1964 and 2n = 33 (15II+X 1 y+x 2 ) Virkki, 1988b) as well as Phenrica austriaca which has been variously described as having a karyotype of 2n = 49 (22II+Xy+3y) by Virkki (1970) and 2n = 49 (22II+X 1 y+X 2 +X 3 +X 4 ) by Virkki (1988b). In this group, the chromosomal morphology is predominantly metacentric and the sex determination system is variable, with frequent occurrence of multiple systems, involving mainly the X chromosome (Smith and Virkki, 1978;Vidal, 1984;Virkki, 1988b).…”

Section: Introductionmentioning

confidence: 99%

Karyotype characterization, constitutive heterochromatin and nucleolus organizer regions of Paranaita opima (Coleoptera, Chrysomelidae, Alticinae)

2006

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Species of the subtribe Oedionychina not only have a highly uniform diploid number of 2n = 22 (20+X+y) but have the karyotypic peculiarity of possessing extremely large sex chromosomes. We analyzed Paranaita opima embryos and gonadal cells to determine their diploid number, chromosomal morphology, type of sex determination system, constitutive heterochromatin pattern and which chromosomes bear nucleolus organizer regions (NORs). The diploid number of P. opima was 2n = 22 (20+XY/XX) with all chromosomes being metacentric. Chromosome pair 6 showed an interstitial secondary constriction on the short arm. The C-banding technique revealed centromeric constitutive heterochromatin in all chromosomes, which, in pair 6, extended up to the secondary constriction of the short arm, additional C-bands also being present on the Y chromosome. Silver nitrate nucleolar organizer region (Ag-NOR) staining showed NORs on the secondary constriction of pair 6. Fluorochrome analysis with chromomycin A 3 (CMA 3 ), 4'-6-diamidino-2-phenylindole (DAPI) and the distamycin A (DA) counterstain showed that the short arm of chromosome pair 6 exhibited a GC-rich block extending from the proximal to the median region, including part of the secondary constriction. The same techniques also showed AT-rich blocks at the centromeric region of all chromosomes and at the terminal region of the short arm of pair 6. The basic karyotype characteristics and C band pattern of P. opima are similar to those described for other species in the subtribe Oedionychina. The pattern of autosomal NORs observed in P. opima corresponds to that registered in the majority of the Chrysomelidae species.

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Chromosome numbers of Coleoptera from Argentina

Cited by 41 publications

References 0 publications

Comparative cytogenetic analysis in 13 tortoise beetles (Coleoptera: Chrysomelidae: Cassidinae) from Brazil

Comparative cytogenetic analysis in 13 tortoise beetles (Coleoptera: Chrysomelidae: Cassidinae) from Brazil

Chromosome mapping of 28S ribosomal genes in 11 species of Cassidinae (Coleoptera: Chrysomelidae)

Karyotype characterization, constitutive heterochromatin and nucleolus organizer regions of Paranaita opima (Coleoptera, Chrysomelidae, Alticinae)

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