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

2017; American Society of Tropical Medicine and Hygiene; Volume: 98; Issue: 2 Linguagem: Inglês

10.4269/ajtmh.17-0270

1476-1645

Kaio Cesar Chaboli Alevi, Heloisa Pinotti, Renato Freitas de Araújo, Maria Tercília Vilela de Azeredo‐Oliveira, João Aristeu da Rosa, Vagner José Mendonça,

Nematode management and characterization studies

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 T riatoma lenti males to possibly characterize the postzygotic isolation associated with the hybrid breakdown. All cells analyzed presented a karyotype of 2 n = 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.