Spiracles of 5th instar nymphs in six species of Triatominae (Hemiptera, Reduviidae) using Scanning Electron Microscopy

Rosa, João Aristeu da; Barata, José Maria Soares; Barelli, Nilso

doi:10.1590/s0074-02761992000200020

Cited by 10 publications

(11 citation statements)

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“…Pode-se visualizar no IX segmento tubérculos setíferos proeminentes com cerdas de ápice rombo e serrilhado apenas em T. williami, característica esta não observada em T. vandae. A morfologia dos últimos segmentos abdominais das ninfas dos triatomíneos já tem sido evidenciada por vários autores (Espínola 1966, Rosa et al 1992a que definiram o futuro sexo através de sua morfologia. Carcavallo et al (1994bCarcavallo et al ( , c, 1995 evidenciaram semelhanças e diferenças com valor sistemático da região óculo-ocelar das espécies conhecidas do gênero Rhodnius Stål,1859, de 11 espécies do gênero Panstrogylus Berg, 1879 e do gênero Psammolestes Bergroth, 1911.…”

Section: Triatoma Williami Ovosunclassified

Morfologia comparada dos ovos e ninfas de Triatoma vandae Carcavallo, Jurberg, Rocha, Galvão, Noireau & Lent, 2002 e Triatoma williami Galvão, Souza & Lima, 1965 (Hemiptera, Reduviidae, Triatominae)

Silva

Jurberg

Barbosa

et al. 2005

Mem. Inst. Oswaldo Cruz

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Section: Triatoma Williami Ovosunclassified

Morfologia comparada dos ovos e ninfas de Triatoma vandae Carcavallo, Jurberg, Rocha, Galvão, Noireau & Lent, 2002 e Triatoma williami Galvão, Souza & Lima, 1965 (Hemiptera, Reduviidae, Triatominae)

Silva

Jurberg

Barbosa

et al. 2005

Mem. Inst. Oswaldo Cruz

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“…In an early article presented by Rangel (1979) some morphological aspects of the anatomy of the digestive apparatus of P. megistus nymphs are mentioned and distinct features of nymph instars are presented in other studies (Côrrea 1954, Ramírez-Pérez 1969, Carcavallo et al 1978, Lent & Wygodzinsky 1979,Jimenez & Fuentes 1981, Brewer et al 1981, Gonçalves et al, 1985, Rosa et al 1992a, 1992b, 1995, 2000, Rosa & Barata 1997, Galvão et al 2005. Rosa et al (2000), when studying two colonies of st .…”

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confidence: 99%

Morphometry and morphology of the antennae of Panstrongylus megistus Burmeister, Rhodnius neglectus Lent, Rhodnius prolixus Stal and Triatoma vitticeps Stal (Hemiptera: Reduviidae)

Rosa¹,

Freitas²,

Malara³

et al. 2010

Neotrop. entomol.

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) for all fi ve instars. The morphological study of the second antennal segment by scanning electron microscopy (SEM) disclosed that the fi rst instars of all four species exhibit type I bristles sensillae and one trichobothrium. Another type III bristle and basiconic, campaniform, coeloconic, trichoid sensillae and type I bristle and trichobothria were noted on their fourth instars and adults. Campaniform sensillae were noted only on T. vitticeps adults. Nodules were observed in the joint between 1 st and 2 nd antennal segments of adults of P. megistus and T. vitticeps, but not on R. neglectus and R. prolixus.KEY WORDS: Triatominae, mensuration, electron microscopy, sensilla The Chagas' disease, which is caused by the fl agellate protozoan parasite Trypanosoma cruzi, is widespread in North and South America from Mexico to southern Argentina and Chile, and is still considered a major public health issue in Latin America (WHO 2005). Great advances have been made in the reduction of vectorial and transfusional transmission, with a resulting alleviation in the incidence of Chagas' disease. Yet, it is estimated that a total of 18 million individuals are still infected in 17 Central and Latin American countries. Approximately 93 million people live in the endemic areas, and 200,000 new cases occur annually in these areas (WHO 2005).Panstrongylus megistus Burmeister was fi rst recorded to transmit T. cruzi in 1909T. cruzi in (Chagas 1909, and is one of the six major species vectoring the Chagas' disease (Silveira 1983, Dias 1993, Brazilian Health Ministry 2005. Rhodnius neglectus Lent plays a secondary role in transmitting the disease; however, it is widespread in the Brazilian states of Bahia, Goiás, Mato Grosso, Maranhão, Minas Gerais, Paraná, Pernambuco and São Paulo (Silveira 1983, Galvão et al 2003. Rhodnius prolixus Stal can be found in 16 Latin American countries and is an important vector of T. cruzi, especially in Venezuela, Colombia and French Guiana (Lent & Wygodzinsky 1979, Galvão et al 2003). Even though Triatoma vitticeps Stal is considered the most important vector in Bahia, Espírito Santo, Minas Gerais and Rio de Janeiro, studies on this species are very scarce (Galvão et al 2003).Despite the fact that immatures also play an important role in the transmission of the Chagas' disease, there are very few information on their morphology. In an early article presented by Rangel (1979) some morphological aspects of the anatomy of the digestive apparatus of P. megistus nymphs are mentioned and distinct features of nymph instars are presented in other studies (Côrrea 1954, Ramírez-Pérez 1969, Carcavallo et al 1978, Lent & Wygodzinsky 1979,Jimenez & Fuentes 1981, Brewer et al 1981, Gonçalves et al, 1985, Rosa et al 1992a, 1992b, 1995, 2000, Rosa & Barata 1997, Galvão et al 2005.Rosa st . March -April 2010 Neotropical Entomology 39(2) 215The importance of the study of the morphological traits of triatomine vectors, beyond their physiological importance as reported by Wigglesworth & Gillett (1934), Chaika (19...

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“…Although the species P. megistus and T. tibiamaculata have distinct morphology, some morphological patterns are similar, as observed in fifth-instar female nymphs showing similarities on the eighth ventral segment structures, as well as between sensilla (Rosa et al, 1992). Therefore, the study of their spermathecae reveals a morphological pattern, the only differences being related to size.…”

Section: Tablementioning

confidence: 72%

Morphology of the spermathecae of twelve species of Triatominae (Hemiptera, Reduviidae) vectors of Chagas disease

et al. 2017

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Trypanosoma cruzi, the etiological agent of Chagas disease, is transmitted by triatomines that have been described in a large number of studies. Most of those studies are related to external morphology and taxonomy, but some biochemical, genetic and physiological studies have also been published. There are a few publications in the literature about the internal organs of Triatominae, for instance the spermathecae, which are responsible for storing and maintaining the viability of the spermatozoids until the fertilization of the oocytes. This work aims to study the spermathecae of twelve species of triatomines obtained from the Triatominae Insectarium of the Faculty of Pharmaceutical Sciences, UNESP, Araraquara, using optical microscopy and scanning electron microscopy. The spermathecae of the twelve species studied showed three morphological patterns: a) P. herreri sn, P. lignarius, P. megistus, Triatoma brasiliensis, T. juazeirensis, T. sherlocki and T. tibiamaculata have spermathecae with a thin initial portion and an oval-shaped final portion; b) R. montenegrensis, R. nasutus, R. neglectus, R. pictipes and R. prolixus have tubular and winding spermathecae; c) T. infestans has oval spermathecae. In addition to the three morphological patterns, it was noted that each of the twelve species has particular features that differentiate them.

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Spiracles of 5th instar nymphs in six species of Triatominae (Hemiptera, Reduviidae) using Scanning Electron Microscopy

Cited by 10 publications

References 0 publications

Morfologia comparada dos ovos e ninfas de Triatoma vandae Carcavallo, Jurberg, Rocha, Galvão, Noireau & Lent, 2002 e Triatoma williami Galvão, Souza & Lima, 1965 (Hemiptera, Reduviidae, Triatominae)

Morfologia comparada dos ovos e ninfas de Triatoma vandae Carcavallo, Jurberg, Rocha, Galvão, Noireau & Lent, 2002 e Triatoma williami Galvão, Souza & Lima, 1965 (Hemiptera, Reduviidae, Triatominae)

Morphometry and morphology of the antennae of Panstrongylus megistus Burmeister, Rhodnius neglectus Lent, Rhodnius prolixus Stal and Triatoma vitticeps Stal (Hemiptera: Reduviidae)

Morphology of the spermathecae of twelve species of Triatominae (Hemiptera, Reduviidae) vectors of Chagas disease

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