Estudos morfológicos de Cavernicola lenti Barrett &amp; Arias, 1985 (Hemiptera, Reduviidae, Triatominae)

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The ultrastructural morphology of the ventral region of the head (rostrum and buccula) and proesternum (stridulatory sulcus) of nymphs from the 1st to 5th instars of Triatoma guazu Wygodzinsky, 1979 and Triatoma jurbergi Carcavallo, Galvão & was described. Morphological differences between the two species and of the five nymphal stages development of each species were observed. These structures showed systematic differential characteristics of the studied species and may be used to increase their taxonomic range.

Section: Discussionmentioning

confidence: 99%

Comparative study of the stridulatory sulcus, buccula and rostrum of the nymphs of Triatoma guazu Lent & Wygodzinsky, 1979 and Triatoma jurbergi Carcavallo, Galvão & Lent, 1998 by scanning electron microscopy (Hemiptera, Reduviidae)

Silva

Barbosa²,

Galvão

et al. 2003

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“…There have also been reports of the presence of this species in Colombia and Venezuela (Carcavallo et al 1999. All these findings emphasize the importance of studies to promote greater knowledge of this species, and among these, studies of the ultrastructure of specimens coming from the Negro River.Morphological studies on triatomines, utilizing the resources of scanning electron microscopy, have been performed by several authors on different species and in relation to all stages of development (Lent & Wygodzinsky 1979, Barata 1981, Gonçalves et al 1985, Costa et al 1991, Galíndez Girón et al 1994, Silva et al 2003. These studies have made effective contributions towards the systematics of triatomines, through elucidation of the status of cryptic species and their complexes.…”

mentioning

confidence: 99%

Morphobiological aspects of Rhodnius brethesi Matta, 1919 (Hemiptera:Reduviidae) from the Upper and Middle Negro River, Amazon region of Brazil: I - scanning electron microscopy

Santos-Mallet¹,

Junqueira

Moreira

et al. 2005

The occurrence of autochthonous cases of Chagas disease in the Amazon region of Brazil over recent decades has motivated an intensification of studies in this area. Different species of triatomines have been identified, and ten of these have be proven to be carriers of the parasite Trypanosoma cruzi or "cruzi-like" parasites. Studies conducted in the municipalities of Santa Isabel do Rio Negro and Barcelos, located on the Upper and Middle of the Negro River, microregion of Negro River, state of Amazonas have confirmed not only thatRhodnius brethesi is present in the palm tree Leopoldinia piassaba, but also that this insect was recognized by palm fiber collectors. A morphological study of eyes, inter-ocular and inter-ocellar regions, antennae, buccula, labrum, rostrum, stridulatory sulcus and feet, including the apex of the tibia, spongy fossette and ctenidium was conducted by scanning electron microscopy. The buccula and the stridulatory sulcus presented notable differences in specimens of different genera and also of different species. These data make it possible to suggest that the details presented in these structures can be included as diagnostic characteristics to be used in new dichotomous keys, thereby contributing towards studies of taxonomy and systematics and furnishing backing for comparative analysis of specimens collected from different localities.Key words: Rhodnius brethesi -external morphology -taxonomy -scanning electron microscopy -Amazon region -Brazil Over recent years, attention has been drawn to Chagas disease infection in the Amazon region of Brazil because of increased numbers of reports of acute cases and the presence of individuals who are serologically positive for this infection (Coura et al. 1995, 2002a, Fraiha Neto et al. 1995, Valente et al. 1999, Dias et al. 2002. So far, it is unclear whether these growing numbers of human cases are due to increased transmission or whether they are the result from an active search for positive cases. This latter is the case in the state of Pará, where greater numbers of small outbreaks attributed to contamination by oral transmission have been described (Valente et al. 1999).One of the epidemiological profiles discerned in the Amazon region that has received deserved attention is the one found in the Upper and Middle Negro River region, microregion of Negro River in the state of Amazonas. Initial investigations by Coura et al. (1994Coura et al. ( , 1995 indicated that the presence of human infection in areas of the Negro River were associated with extractive activities relating to the collection of fiber from the native palm tree Leopoldinia piassaba Wallace, 1853. The link in the transmission cycle was pinpointed as the contact between the fiber gatherer and the species of triatomines present in the extraction areas (Coura et al. 2002a). The data obtained though that investigation showed that two vector species were present in the extraction areas: Rhodnius brethesi Matta, 1919, and Panstrongylus geniculatus (Latreille, 1811). The first of th...

“…Barata (1981), Costa et al (1991) and Jurberg et al (1993) described generic characteristics, using the morphology of eggs for the genera Rhodnius, Cavernicola and Dipetalogaster, respectively. A great variability is present on the genera Alberprosenia, Cavernicola, Dipetalogaster, Eratyrus, Microtriatoma and Psammolestes, which facilitates the identification of each taxon.…”

Section: Discussionmentioning

confidence: 99%

“…Gonçalves et al (1985), Costa et al (1991), Rosa (1995) and Naegele et al (2003) mentioned the presence of ctenidia on the forelegs of Triatominae nymphs. The ventral surface of the femur of T. dimidiata has 1 + 1 prominent subapical tubercles with bristles smaller than the tubercles.…”

Section: Discussionmentioning

confidence: 99%

Morphological study of the eggs and nymphs of Triatoma dimidiata (Latreille, 1811) observed by light and scanning electron microscopy (Hemiptera: Reduviidae: Triatominae)

Mello¹,

Jurberg²,

Grazia³

2009