Hybrid Collapse Confirms the Specific Status of Triatoma bahiensis Sherlock and Serafim, 1967 (Hemiptera, Triatominae), an Endemic Species in Brazil

Kaio Cesar Chaboli Alevi Departamento de Biologia, Instituto de Biociências, Letras e Ciências Exatas, Universidade Estadual Paulista “Júlio de Mesquita Filho” – IBILCE/UNESP, São José do Rio Preto, São Paulo, Brazil;

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Heloisa Pinotti Departamento de Ciências Biológicas, Faculdade de Ciências Farmacêuticas, Universidade Estadual Paulista “Júlio de Mesquita Filho”, FCFAR/UNESP, Araraquara, São Paulo, Brazil;

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Renato Freitas de Araújo Secretaria Estadual de Saúde da Bahia – SESAB/Divisão de Entomologia, Centro Administrativo da Bahia, Salvador, Bahia, Brazil;

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Maria Tercília Vilela de Azeredo Oliveira Departamento de Biologia, Instituto de Biociências, Letras e Ciências Exatas, Universidade Estadual Paulista “Júlio de Mesquita Filho” – IBILCE/UNESP, São José do Rio Preto, São Paulo, Brazil;

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João Aristeu da Rosa Departamento de Ciências Biológicas, Faculdade de Ciências Farmacêuticas, Universidade Estadual Paulista “Júlio de Mesquita Filho”, FCFAR/UNESP, Araraquara, São Paulo, Brazil;

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Vagner José Mendonça Departamento de Parasitologia e Microbiologia, Centro de Ciências da Saúde, Universidade Federal do Piauí, UFPI, Campus Ministro Petrônio Portella, Teresina, Piauí, Brazil

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Six to seven million people worldwide are estimated to be infected with Trypanosoma cruzi, the etiologic agent of Chagas disease transmitted mainly by triatomines. Triatoma bahiensis was recently collected in the Brazilian state of Bahia and revalidated using different approaches. The main criterion used to define a “good” biological species is reproductive isolation, so we evaluated the cytogenetics of first-generation (F1) hybrids resulting from the experimental cross between T. bahiensis females and Triatoma lenti males to possibly characterize the postzygotic isolation associated with the hybrid breakdown. All cells analyzed presented a karyotype of 2n = 22 and a pair of univalent autosomes. This chromosome behavior represents hybrid collapse and underscores the specific status of T. bahiensis. Thus, we have characterized the presence of the hybrid collapse phenomenon in an experimental cross, and we confirm the specific status of T. bahiensis, thus contributing to the Triatominae taxonomy.

Author Notes

Address correspondence to Vagner José Mendonça, Departamento de Parasitologia e Microbiologia, Centro de Ciências da Saúde, Universidade Federal do Piauí, UFPI, Av. Universitária - lado ímpar, Ininga, 64049550 Teresina, PI, Brazil. E-mail: vagjose@hotmail.com

Financial support: The study was supported by Fundação de Amparo à Pesquisa do Estado de São Paulo (process numbers 2013/19764-0, Brazil) and Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, Brazil).

Authors’ addresses: Kaio Cesar Chaboli Alevi and Maria Tercília Vilela de Azeredo Oliveira, Instituto de Biociências, Letras e Ciências Exatas, Universidade Estadual Paulista “Júlio de Mesquita Filho” – IBILCE/UNESP, Rua Cristóvão Colombo, 2265, 15054-000, São José do Rio Preto, SP, Brazil, E-mails: kaiochaboli@hotmail.com and tercilia@ibilce.unesp.br. Heloisa Pinotti and João Aristeu da Rosa, Faculdade de Ciências Farmacêuticas, Universidade Estadual Paulista “Júlio de Mesquita Filho”, FCFAR/UNESP, Rodovia Araraquara-Jaú km 1, 14801-902, Araraquara, SP, Brazil, E-mails: helopinotti@hotmail.com and joaoaristeu@gmail.com. Renato Freitas Araújo, Secretaria Estadual de Saúde da Bahia – SESAB/Divisão de Entomologia, Av. Luis Viana Filho, 400 - Centro Administrativo da Bahia, 41745-900, Salvador, BA, Brazil, E-mail: birdeagle01@yahoo.com.br. Vagner José Mendonça, Centro de Ciências da Saúde, Universidade Federal do Piauí, UFPI, Av. Universitária - lado ímparIninga, 64049550 - Teresina, PI, Brazil, E-mail: vagjose@hotmail.com.

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