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Reconstructing Sordida subcomplex (Hemiptera, Reduviidae, Triatominae) phylogeny across species distribution range
Gabriela Burgueño-Rodríguez1, Julieta Nattero2,3,4, Néstor Ríos1
1Universidad de la República, Facultad de Ciencias, Sección Genética Evolutiva, Montevideo, Uruguay.
Memorias Do Instituto Oswaldo Cruz
|December 19, 2025
Summary
Genetic analysis reveals at least six species within the Triatoma sordida complex, challenging previous classifications. Molecular methods prove superior to morphology for accurate species identification in Triatominae.
Area of Science:
- Entomology
- Molecular Biology
- Genetics
Background:
- The Sordida subcomplex classification is debated, with Triatoma sordida, T. garciabesi, and T. rosai currently recognized.
- These species exhibit high morphological similarity, overlapping ranges, and hybridization, complicating identification.
Purpose of the Study:
- To investigate the genetic diversity and geographic distribution of the Triatoma sordida subcomplex.
- To resolve taxonomic ambiguities within this group of Triatominae.
Main Methods:
- Analysis of mitochondrial cytochrome b gene fragments.
- Chromosomal studies on natural populations across Argentina, Bolivia, Brazil, and Paraguay.
Main Results:
- Phylogenetic analyses indicated genetic distances suggesting a minimum of six distinct putative species.
- Current species designations within the Sordida subcomplex may be insufficient.
Conclusions:
- Molecular analyses are crucial for accurate species identification in Triatominae.
- Morphological characteristics alone are inadequate for classifying species within the Sordida subcomplex.
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