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Revista da Sociedade Brasileira de Medicina Tropical

Print version ISSN 0037-8682On-line version ISSN 1678-9849

Rev. Soc. Bras. Med. Trop. vol.52  Uberaba  2019  Epub Mar 18, 2019 

Short Communication

First report of Panstrongylus lignarius (Walker, 1873) (Hemiptera: Reduviidae: Triatominae) in the State of Acre, Brazil

Mariane Albuquerque Lima Ribeiro1  2 

Gabriela Vieira de Souza Castro1  2 

Janis Lunier de Souza3 

Acigelda da Silva Cardoso3 

Fernanda Portela Madeira1  2 

Luis Marcelo Aranha Camargo2  4  5  6  7 

Dionatas Ulises de Oliveira Meneguetti2  8  9  10

1Centro de Ciências da Saúde e do Desporto, Universidade Federal do Acre, Rio Branco, AC, Brasil.

2Programa de Pós-Graduação Stricto Sensu em Ciência da Saúde na Amazônia Ocidental, Universidade Federal do Acre, Rio Branco, AC, Brasil.

3Departamento de Entomologia, Secretaria Municipal de Saúde, Rio Branco, AC, Brasil.

4Instituto de Ciências Biomédicas-5, Universidade de São Paulo, Monte Negro, RO, Brasil.

5Departamento de Medicina, Faculdade São Lucas, Porto Velho, RO, Brasil.

6Centro de Pesquisas em Medicina Tropical, Porto Velho, RO, Brasil.

7Instituto Nacional de Ciência e Tecnologia EpiAmo, Porto Velho, RO, Brasil.

8Programa de Pós-Graduação Stricto Sensu em Ciência, Inovação e Tecnologia para a Amazônia, Universidade Federal do Acre, Rio Branco, AC, Brasil.

9Colégio de Aplicação, Universidade Federal do Acre, Rio Branco, AC, Brasil.

10Programa de Pós-Graduação em Biodiversidade e Biotecnologia, Rio Branco, AC, Brasil.



This communication reports the first occurrence of Panstrongylus lignarius in the State of Acre, Brazil.


A specimen of P. lignarius was collected from a residence in a rural area of the municipality of Rio Branco, Acre, Western Amazon.


This new report of P. lignarius extends the distribution of this species to eight Brazilian states, and also increases the number of species of Triatominae described from the state of Acre from nine to ten.


The occurrence of P. lignarius deserves attention, since this species has the potential for domiciliation and transmitting Trypanosoma cruzi.

Keywords: Triatominae; Panstrongylus; Western Amazon

The subfamily Triatominae currently comprises 153 species (151 recent and 2 fossil species)1,2, with Panstrongylus being the third most abundant triatomine genus, with 15 species described so far3. The insects in this genus have wide distributions in Central and South America, where they have several different habitats and behaviors, including some specimens having reportedly been found in human dwellings4.

The occurrence of the species Panstrongylus lignarius (Walker, 1873) has only been recorded in South America in the following countries: Ecuador, Peru, Guyana, French Guiana, Suriname, Venezuela, and Brazil5. In Brazil, P. lignarius has already been described from the states of Amazonas, Maranhão, Pará, Tocantins5,6, Mato Grosso4, Amapá7, and Rondônia8, all of which belong to the Legal Amazon region. This distribution is expanded by the present study, which describes the first report of the occurrence of P. lignarius in the state of Acre, Brazil.

In October 2017, four triatomines were collected in a dwelling in a rural area of ​​the municipality of Rio Branco, Acre, Brazil (Latitude 10°01'29''S, Longitude 67°30'44''W), three of which were Rhodnius robustus Larrousse, 1927, and one of which was P. lignarius.

The triatomines were collected by the residents of the dwelling themselves in a room of the residence, which presents mixed structural characteristics in that it is constructed from wood (Figure 1A) and masonry “still without plaster” (Figure 1B). In the room, the walls are timbered and have cracks (Figure 1C), representing suitable refuges for these insects. Around the house, stacked bricks (Figure 1D) and tiles (Figure 1E) were observed, in addition to an abandoned shack (Figure 1F). The residence is located near a pasture and a small fragment of secondary forest (Figure 1G) located approximately 150 m away from the house. Attalea sp. palms also occur in its vicinity (Figure 1H). A new survey was carried out in the residence, but no other triatomines were found.

FIGURE 1: (A) Residence where the triatomine specimens were captured. (B) External part of the masonry of the residence, without plaster. (C) Interior of the room with timber-framed walls with cracks. (D) Bricks stowed outside the residence. (E) Stacked tiles. (F) Abandoned shack. (G) Pasture environment and small fragment of secondary forest near the residence. (H) Attalea sp. palm tree near the residence. 

The triatomines were sent to the Laboratory of Tropical Medicine (LABMEDT) at the Federal University of Acre (UFAC), where the identification of the species was carried out based on external morphological characteristics, as described by Galvão5 and Lent & Wygodzinsky9. When the specimen of P. lignarius arrived at LABMEDT, it was already dead and dried out, and so it was not feasible to test it for the presence of trypanosomatids. Therefore, this is the first and only individual of this species found until the present moment in the state of Acre.

P. lignarius (Figure 2) shows generally light brown to yellowish dorsal and dark brown or black ventral coloration8,9, and has a partially black scutellum with a longitudinal mid-yellow stripe, a posterior scutellum process with a slight basal hump, and a pronotum with sublateral and tibial tubercles with small sub-basal yellow spots4.

FIGURE 2: Panstrongylus lignarius. (A) Dorsal view. (B) Ventral view. 

In Peru, the country neighboring the state of Acre, a morphotype of P. herreri Wygodzinsky, 1948 (a likely synonym of P. lignarius, as suggested by Marcilla et al.10) is found, which is the species with the highest registered domiciliary there and is thus considered the species of the second most epidemiological importance for T. cruzi transmission4,8.

This new report of P. lignarius extends the geographic distribution of this species to eight Brazilian states (Figure 3), while also increasing the number of triatomine species described from the state of Acre from nine11 to ten, comprising the following: five species of the genus Rhodnius (R. robustus, R. pictipes Stal 1872, R. montenegrensis Rosa et al. 2012, R. stali Lent, Jurberg & Galvão, 1993, and R. neglectus Lent, 195412,13), one of the genus Eratyrus (E. mucronatus Stal, 185914), one of the genus Triatoma (T. sordida Stål, 185915), and now three of the genus Panstrongylus (P. geniculatus Latreille, 18116, P. megistus Burmeister, 183511, and P. lignarius).

FIGURE 3: Geographic distribution of the species P. lignarius in South America, and location of the new report of this species in this study. 

Ethical considerations

The specimens were collected with permission from the Brazilian Institute of Environment and Renewable Natural Resources [Instituto Brasileiro do Meio Ambiente e dos Recursos Naturais Renováveis (IBAMA)], under permanent license No. 52260-1.


Fundação de Amparo à Pesquisa do Estado do Acre (FAPAC). Pró-Reitoria de Pesquisa e Pós-Graduação da Universidade Federal do Acre (UFAC). Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPQ).


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Financial Support: Programa Pesquisa Para o SUS: Gestão Compartilhada em Saúde (PPSUS) 001/2015 e 002/2016 - Fundação de Amparo à Pesquisa do Estado do Acre (FAPAC). Chamada Universal MCTI/CNPQ Nº 01/2016.

Received: July 24, 2018; Accepted: August 31, 2018

Corresponding author: Dr. Dionatas Ulises de Oliveira Meneguetti.

Conflict of Interest: The authors declare that there is no conflict of interest.

Creative Commons License This is an open-access article distributed under the terms of the Creative Commons Attribution License