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4 results on '"Vilela, Carlos R."'

1. An investigation of Y chromosome incorporations in 400 species of Drosophila and related genera.

Author

Dupim, Eduardo G., Goldstein, Gabriel, Vanderlinde, Thyago, Vaz, Suzana C., Krsticevic, Flávia, Bastos, Aline, Pinhão, Thadeo, Torres, Marcos, David, Jean R., Vilela, Carlos R., and Carvalho, Antonio Bernardo

Subjects
Y chromosome, SEX chromosomes, DROSOPHILA, GENES, GENETIC sex determination
Abstract

Y chromosomes are widely believed to evolve from a normal autosome through a process of massive gene loss (with preservation of some male genes), shaped by sex-antagonistic selection and complemented by occasional gains of male-related genes. The net result of these processes is a male-specialized chromosome. This might be expected to be an irreversible process, but it was found in 2005 that the Drosophila pseudoobscura Y chromosome was incorporated into an autosome. Y chromosome incorporations have important consequences: a formerly male-restricted chromosome reverts to autosomal inheritance, and the species may shift from an XY/XX to X0/XX sex-chromosome system. In order to assess the frequency and causes of this phenomenon we searched for Y chromosome incorporations in 400 species from Drosophila and related genera. We found one additional large scale event of Y chromosome incorporation, affecting the whole montium subgroup (40 species in our sample); overall 13% of the sampled species (52/400) have Y incorporations. While previous data indicated that after the Y incorporation the ancestral Y disappeared as a free chromosome, the much larger data set analyzed here indicates that a copy of the Y survived as a free chromosome both in montium and pseudoobscura species, and that the current Y of the pseudoobscura lineage results from a fusion between this free Y and the neoY. The 400 species sample also showed that the previously suggested causal connection between X-autosome fusions and Y incorporations is, at best, weak: the new case of Y incorporation (montium) does not have X-autosome fusion, whereas nine independent cases of X-autosome fusions were not followed by Y incorporations. Y incorporation is an underappreciated mechanism affecting Y chromosome evolution; our results show that at least in Drosophila it plays a relevant role and highlight the need of similar studies in other groups. [ABSTRACT FROM AUTHOR]

Published
2018
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2. A new Neotropical species of spot-thoraxed Drosophila (Diptera, Drosophilidae)

Author

Ratcov, Vilma and Vilela, Carlos R.

Subjects
peruensis group, taxonomy, terminália masculina, caponei group, Mata Atlântica, male terminalia, taxonomia, Atlantic forest, grupo peruensis, grupo caponei
Abstract

Drosophila pauliceia sp. nov., a spot-thoraxed species closely related to Drosophila boraceia Vilela & Val, 2004, is described from flies collected in an urban remnant of the montane Atlantic Forest located at the Cidade Universitária "Armando de Salles Oliveira", São Paulo city, state of São Paulo, Brazil. The two forest-dwelling species can be externally distinguished mainly by having a different pattern of thoracic spots. A new group of spotted flies (peruensis group) is proposed to include them, in addition to Drosophila peruensis Wheeler, 1959, from Urubamba River, Peru, and Drosophila atalaia Vilela & Sene, 1982, from Brazil and Argentina. To facilitate comparisons, illustrations of the male and female terminalia of the new species and of some unpublished views of those of D. atalaia are included. Additionally, a new group of unspotted species (named caponei group) is proposed to include Drosophila caponei Pavan & Cunha, 1947 and D. neochracea Wheeler, 1959, both previously considered to be related to D. atalaia. Drosophila pauliceia sp. nov., espécie com tórax pintado e muito semelhante à Drosophila boraceia Vilela & Val, 2004, é descrita a partir de exemplares procedentes de um fragmento urbano da Mata Atlântica de planalto, localizado na reserva da Cidade Universitária "Armando de Salles Oliveira", cidade de São Paulo, estado de São Paulo, Brasil. As duas espécies podem ser separadas principalmente com base no padrão das pintas do tórax e, juntamente com Drosophila peruensis Wheeler, 1959 e Drosophila atalaia Vilela & Sene, 1982, são incluídas em um novo grupo proposto no presente artigo sob o nome peruensis. Além das ilustrações detalhadas das terminálias masculina e feminina da nova espécie, desenhos inéditos dessas estruturas foram preparados também para Drosophila atalaia. Adicionalmente é proposto o grupo caponei que inclui D. caponei Pavan & Cunha, 1947 e D. neochracea Wheeler, 1959, duas espécies com tórax não pintado embora previamente consideradas próximas à D. atalaia.

Published
2007

3. Two new Neotropical species of Drosophilinae (Diptera: Drosophilidae) from Uruguay.

Author

Goñi, Beatriz and Vilela, Carlos R.

Subjects
*DIPTERA, *ANIMAL species, *GEOGRAPHICAL distribution of insects, *PHOTOMICROGRAPHY
Abstract

Two new species of Drosophilidae from Uruguay are described and illustrated: Drosophila montevidensis sp. nov. (Holotype male in MZSP: Facultad de Agronomía, Universidad de la República, Montevideo city, Department of Montevideo), and Scaptomyza pipinna sp. nov. (Holotype male in MZSP: Sarandí del Consejo, near north shore of Laguna de Castillos, Department of Rocha). The former species belongs to the D. tripunctata group and is sibling to Drosophila nappae Vilela, Valente & Basso-da-Silva, 2004, differing mainly in characters of the aedeagus. The latter is closely related to Scaptomyza striaticeps Wheeler & Takada, 1966, from which it can be distinguished by color and terminalia characters. The new Drosophila species was successfully cultured in a modified banana-agar medium which is provided. Photomicrographs of mitotic and meiotic chromosomes of D. montevidensis sp. nov. are also included. [ABSTRACT FROM AUTHOR]

Published
2016
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4. Two new Neotropical species of Drosophilinae (Diptera: Drosophilidae) from Uruguay

Author

Beatriz Goñi, Carlos Ribeiro Vilela, Goñi Beatriz, Universidad de la República (Uruguay). Facultad de Ciencias. Instituto de Biología, and Vilela Carlos R., Universidade de São Paulo (Brasil)

Subjects
Drosophila tripunctata group, biology, Holotype, Terminalia, Argentina, karyotypes, biology.organism_classification, Aedeagus, taxonomy, Drosophilidae, Botany, lcsh:Zoology, Mesoscaptomyza, Animal Science and Zoology, Taxonomy (biology), lcsh:QL1-991, Karyotypes, Drosophila nappae, Drosophilinae, Taxonomy
Abstract

Two new species of Drosophilidae from Uruguay are described and illustrated: Drosophila montevidensis sp. nov. (Holotype male in MZSP: Facultad de Agronomia, Universidad de la Republica, Montevideo city, Department of Montevideo), and Scaptomyza pipinna sp. nov. (Holotype male in MZSP: Sarandi del Consejo, near north shore of Laguna de Castillos, Department of Rocha). The former species belongs to the D. tripunctata group and is sibling to Drosophila nappae Vilela, Valente & Basso-da-Silva, 2004, differing mainly in characters of the aedeagus. The latter is closely related to Scaptomyza striaticeps Wheeler & Takada, 1966, from which it can be distinguished by color and terminalia characters. The new Drosophila species was successfully cultured in a modified banana-agar medium which is provided. Photomicrographs of mitotic and meiotic chromosomes of D. montevidensis sp. nov. are also included.

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