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. 2013;108 Suppl 1(Suppl 1):92-9.
doi: 10.1590/0074-0276130434.

Rhodnius barretti, a new species of Triatominae (Hemiptera: Reduviidae) from western Amazonia

Fernando Abad-Franch  1 , Márcio G Pavan  2 , Nicolás Jaramillo-O  3 , Francisco S Palomeque  4 , Carolina Dale  5 , Duverney Chaverra  3 , Fernando A Monteiro  2
Affiliations

Rhodnius barretti, a new species of Triatominae (Hemiptera: Reduviidae) from western Amazonia

Fernando Abad-Franch et al. Mem Inst Oswaldo Cruz. 2013.

Abstract

Rhodnius barretti, a new triatomine species, is described based on adult specimens collected in rainforest environments within the Napo ecoregion of western Amazonia (Colombia and Ecuador). R. barretti resembles Rhodnius robustus s.l., but mitochondrial cytochrome b gene sequences reveal that it is a strongly divergent member of the "robustus lineage", i.e., basal to the clade encompassing Rhodnius nasutus, Rhodnius neglectus, Rhodnius prolixus and five members of the R. robustus species complex. Morphometric analyses also reveal consistent divergence from R. robustus s.l., including head and, as previously shown, wing shape and the length ratios of some anatomical structures. R. barretti occurs, often at high densities, in Attalea butyracea and Oenocarpus bataua palms. It is strikingly aggressive and adults may invade houses flying from peridomestic palms. R. barretti must therefore be regarded as a potential Trypanosoma cruzi vector in the Napo ecoregion, where Chagas disease is endemic.

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Figures

Fig. 1
Fig. 1. : dorsal (top) and lateral (bottom) views of a Rhodnius barretti head, showing linear measurements (1-8) (Table) and landmarks (target spots) used in morphometric analyses. Bar = 1 mm.
Fig. 2
Fig. 2. : geometric morphometrics results: factorial map built with the first two canonical vectors (CV) showing 100% head shape discrimination between R. barretti sp. nov. (Colombia and Ecuador) and R. robustus s.l. (Bolivia, Brazil, Colombia, Ecuador and French Guiana). R. barretti are deposited at the Group of Biology and Infectious Disease Control (BCEI) (Universidad de Antioquia, Medellín, Colombia) and Oswaldo Cruz Institute (IOC) (Rio de Janeiro, Brazil) collections. Ecuadorian specimens are marked as open circles.
Fig. 3
Fig. 3. : Rhodnius barretti (left) and sympatric Rhodnius robustus s.l. (right) from north-eastern Ecuador: general aspect of adult specimens in dorsal view. The inset shows the head and pronotum of an atypical, paler form of R. barretti.
Fig. 4
Fig. 4. : bayesian consensus tree of 13 663 bp cyt b Rhodnius sequences and a heatmap illustrating genetic distance values. Posterior probabilities > 0.95 are shown for key nodes. Squares in the heatmap illustrate pairwise genetic distance values between sequences, with darker colours representing larger distances (see scale bar). Collection sites and GenBank accessions are: Rhodnius prolixus - Portuguesa, Venezuela, EF011723; Rhodnius robustus I - Trujillo, Venezuela, AF421340; R. robustus II - Napo, Ecuador, AF421341; R. robustus III - Pará (PA), Brazil, AF421342; R. robustus IV - PA, Brazil, AF421342; R. robustus V - Novo Airão, Amazonas (AM), Brazil, JX273158; Rhodnius nasutus - Ceará, Brazil, JX273155; Rhodnius neglectus - Tocantins, Brazil, JX273156; Rhodnius pictipes - AM, Brazil; Rhodnius barretti - Lago Agrio, Sucumbíos, Ecuador (1), JX273159; R. barretti - Lago Agrio, Sucumbíos, Ecuador (2), JX273160; R. barretti - Puerto Asís, Putumayo, Colombia (1 and 2), JX273161 and JX273162.
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References

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