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2030-01-01
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MORPHOLOGICAL EVIDENCE SUGGESTS HOMOPLOID HYBRIDIZATION AS A POSSIBLE MODE OF SPECIATION IN THE TRIATOMINAE (HEMIPTERA, HETEROPTERA, REDUVIIDAE)
T. b. macromelasoma
T. juazeirensis
Chagas disease vectors
Speciation
homoploid hybridization
Affilliation
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biodiversidade Entomológica. Rio de Janeiro, RJ. Brasil.
The University of Kansas. Natural History Museum and Biodiversity Research Cent. Lawrence, KS, USA.
Institut de Recherches pour le Développement. UMR IRD-CNRS 2724, Montpellier, France.
The University of Kansas. Natural History Museum and Biodiversity Research Cent. Lawrence, KS, USA.
Institut de Recherches pour le Développement. UMR IRD-CNRS 2724, Montpellier, France.
Abstract
All known significant insect vectors of Trypanosoma cruzi are members of the Reduviidae, subfamily
Triatominae. Infections with this parasite are the cause of Chagas disease, the single most costly parasitic
disease in the Western Hemisphere. The Triatominae are almost completely restricted to the Americas,
with >130 species distributed in several foci of species richness and endemism; nevertheless, the
processes involved in the diversification of this group remain poorly understood. The Triatoma
brasiliensis species complex was recently proposed based on geography, morphology, ecology, and
molecular data, and is believed to comprise two species and two subspecies. Here, we report results from
a broad series of studies, in which first-generation offspring of experimental crosses were studied in
terms of wing morphometry and phylogenetic position. Morphometrics, morphological, ecological and
geographic analyses were consistent with the hypothesis of T. brasiliensis macromelasoma as a product of
hybridization between two others (T. brasiliensis brasiliensis and T. juazeirensis). Although evidence is
supportive of the hypothesis of speciation via hybridization as a mode of triatomine diversification, the
case is not as-yet conclusive, and confirmation via molecular markers is necessary.
Keywords
T. b. brasiliensisT. b. macromelasoma
T. juazeirensis
Chagas disease vectors
Speciation
homoploid hybridization
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