cytotaxonomy

Karyotype of Rhodnius montenegrensis (Hemiptera, Triatominae)

K. C. C. Alevi, Ravazi, A., Mendonça, V. J., Rosa, J. A., and Azeredo-Oliveira, M. T. V., Karyotype of Rhodnius montenegrensis (Hemiptera, Triatominae), vol. 14, pp. 222-226, 2015.

The Triatominae subfamily comprises 6 tribes. The tribe Rhodniini comprises 2 genera and 22 nominal species. Rhodnius montenegrensis (Hemiptera, Triatominae) was recently described as evolutionarily related to R. robustus. Therefore, in order to contribute to karyosystematic study of the tribe Rhodniini, this report describes the number of chromosomes and compares the karyotype of R. montenegrensis to that of all other species in the tribe, in order to determine the karyotypic evolution of the tribe Rhodniini.

Diploid chromosome set of kissing bug Triatoma baratai (Hemiptera, Triatominae)

K. C. C. Alevi, Reis, Y. V., Borgueti, A. O., Mendonça, V. J., Rosa, J. A., and Azeredo-Oliveira, M. T. V., Diploid chromosome set of kissing bug Triatoma baratai (Hemiptera, Triatominae), vol. 14, pp. 1106-1110, 2015.

Triatomines are insects that are taxonomically included in the Hemiptera order and Triatominae subfamily. Based on phenotypic similarity, capacity hybridization, and genetic and ecological aspects, the triatomine species can be grouped into specific complexes and subcomplexes. However, these groupings have not been confirmed. Cytogenetic analyses are important cytotaxonomic tools for improving the taxonomic knowledge of triatomines.

Karyotype of Philodryas nattereri and Philodryas olfersii with a comparative analysis of the Dipsadidae family

M. D. A. Nery, Alves, M. A. O., Aquino, H. D., Nery, E. A., Bezerra, L. B. M., Ribeiro, R. T. M., and Monteiro, H. S. A., Karyotype of Philodryas nattereri and Philodryas olfersii with a comparative analysis of the Dipsadidae family, vol. 14, pp. 6297-6302, 2015.

Cytogenetic studies of Philodryas nattereri and Philodryas olfersii revealed a diploid chromosome number 2n = 36 for both species (3 metacentrics, 4 submetacentrics, and 10 acrocentrics, with a fundamental number of 51 and 52, respectively). The results obtained are novel and similar to those previously described for species belonging to the Dipsadidae family. The conventional karyotype is also novel and divergent from other species of the Dipsadidae family, where a higher proportion of macrochromosomes predominate, revealing two distinct groups in this family.

Chromosomes of Gymnothorax funebris and the karyotypical differentiation within Gymnothorax (Anguilliformes: Muraenidae)

M. A. O. Alves, Monteiro-Junior, J. E., Oliveira, C. A. M., Silveira, R. M., Costa, I. R., and Maggioni, R., Chromosomes of Gymnothorax funebris and the karyotypical differentiation within Gymnothorax (Anguilliformes: Muraenidae), vol. 13, pp. 1127-1132, 2014.

Cytogenetic studies in Gymnothorax funebris revealed a diploid chromosome number 2n = 42 (6 metacentrics, 4 submetacentrics, and 32 acrocentrics, FN = 52). The results obtained are novel and similar to those previously described for species belonging to Muraenidae family. The conventional karyotype is also novel and divergent from other species of the genus Gymnothorax, where a higher proportion of metacentric chromosomes predominate. The data are reported and discussed considering the cytotaxonomy of the genus.

Physical mapping of 18S and 5S genes in pelagic species of the genera Caranx and Carangoides (Carangidae)

U. P. Jacobina, Bertollo, L. A. C., M. Cioffi, B., and Molina, W. F., Physical mapping of 18S and 5S genes in pelagic species of the genera Caranx and Carangoides (Carangidae), vol. 13, pp. 9628-9635, 2014.

In Carangidae, Caranx is taxonomically controversial because of slight morphological differences among species, as well as because of its relationship with the genus Carangoides. Cytogenetic data has contributed to taxonomic and phylogenetic classification for some groups of fish.

Distribution of constitutive heterochromatin in species of triatomines with fragmentation of sex chromosomes X

A. L. Guerra, Alevi, K. C. C., Rosa, J. A., and Azeredo-Oliveira, M. T. V., Distribution of constitutive heterochromatin in species of triatomines with fragmentation of sex chromosomes X, vol. 13, pp. 10279-10284, 2014.

Cytogenetic analyses of triatomines are considered to be important taxonomic tools. Thus, we analyzed the pattern of constitutive heterochromatin in 7 species of triatomine with fragmentation of the sex chromosome X, focusing on the cytotaxonomy of these triatomines. The species analyzed included Triatoma vitticeps, Triatoma melanocephala, Triatoma tibiamaculata, Triatoma protracta, Meccus pallidipennis, Panstrongylus megistus, and Panstrongylus lignarius.

Comparative cytogenetics of spiny rats of the genus Proechimys (Rodentia, Echimyidae) from the Amazon region

E. S. Eler, da Silva, M. N. F., Silva, C. E. F., and Feldberg, E., Comparative cytogenetics of spiny rats of the genus Proechimys (Rodentia, Echimyidae) from the Amazon region, vol. 11, pp. 830-846, 2012.

We made a comparative analysis of the cytogenetics of spiny rat species of the genus Proechimys collected from several sites of the Madeira River basin (Amazonas State, Brazil) and Jari River valley (Pará State, Brazil). Individuals were assigned to three groups based on diploid and fundamental numbers: 2n = 28, FN = 46 (P. cuvieri and P. gr. longicaudatus); 2n = 38, FN = 52 (Proechimys gr. guyannensis), and 2n = 40, FN = 54 (P. gardneri).

Chromosomal diversity and phylogenetic inferences concerning thrips (Insecta, Thysanoptera) in a semi-arid region of Brazil

R. O. Brito, Affonso, P. R. A. M., and Silva, Jr., J. C., Chromosomal diversity and phylogenetic inferences concerning thrips (Insecta, Thysanoptera) in a semi-arid region of Brazil, vol. 9, pp. 2230-2238, 2010.

The order Thysanoptera is composed of cosmopolitan phytophagous and predaceous insects with diverse life histories, behaviors and habits. This order is currently thought to form a trichotomy with Hemiptera and Psocodea; Hemiptera and Thysanoptera are considered to be sister groups. The interrelationships within Thysanoptera remain unclear and cytotaxonomic studies are scarce in thrips. We report, for the first time, chromosomal data on seven species of thrips collected from a semi-arid region in the States of Bahia and Pernambuco (Northeast Brazil).

Karyotypic variability in Iheringichthys labrosus (Teleostei, Pimelodidae) from the Tibagi River basin (Paraná State, Brazil)

L. B. Ribeiro, Matoso, D. A., Almeida, M. C., Vicari, M. R., Moraes-Neto, A., Svidnicki, M. C. C. M., and Artoni, R. F., Karyotypic variability in Iheringichthys labrosus (Teleostei, Pimelodidae) from the Tibagi River basin (Paraná State, Brazil), vol. 7, pp. 718-724, 2008.

Cytogenetic analyses were carried out in a populational sample of Iheringichthys labrosus from the Guaraúna River (Upper Tibagi River; Paraná State, Brazil) in order to provide a karyotypic comparison with another previously studied population from the Lower Tibagi River, characterized by the presence of 32m + 8sm + 6st + 10a (2n = 56, FN = 102) and occurrence of supernumerary chromosomes (80% of individuals). The 17 specimens of I.

Unusual chromosome numbers in Paspalum L. (Poaceae: Paniceae) from Brazil

A. P. S. Peñaloza, Côrtes, A. L., Pozzobon, M. T., Santos, S., Rua, G. H., and Valls, J. F. M., Unusual chromosome numbers in Paspalum L. (Poaceae: Paniceae) from Brazil, vol. 7, pp. 399-406, 2008.

Somatic chromosome numbers were determined for 20 new germplasm accessions of Paspalum, belonging to 17 species collected in Brazil. Chromosome number is reported for the first time for P. reduncum (2n = 18), P. cinerascens (2n = 20), P. cordatum (2n = 20), P. filgueirasii (2n = 24), P. ammodes (2n = 36), P. bicilium (2n = 40), P. heterotrichon (2n = 40), and P. burmanii (2n = 48). New cytotypes were confirmed for two germplasm accessions of P. carinatum (2n = 30) and P.

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