Please use this identifier to cite or link to this item: https://www.arca.fiocruz.br/handle/icict/27514
Title: Morphological study of the eggs and nymphs of Triatoma dimidiata (Latreille, 1811) observed by light and scanning electron microscopy (Hemiptera: Reduviidae: Triatominae)
Authors: Mello, F.
Jurberg, José
Grazia, J.
Affilliation: Fundação Estadual de Produção e Pesquisa em Saúde. Instituto de Pesquisas Biológicas. Laboratório Central de Saúde Pública do Rio Grande do Sul. Porto Alegre, RS, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório Nacional e Internacional de Referência em Taxonomia de Triatomíneos. Rio de Janeiro, RJ. Brasil.
Universidade Federal do Rio Grande do Sul. Porto Alegre, RS, Brasil.
Abstract: Eggs and nymphs of Triatoma dimidiata were described using both light and scanning electron microscopy. The egg body and operculum have an exochorion formed by irregular juxtaposed polygonal cells; these cells are without sculpture and the majority of them are hexagonal in shape. The five instars of T. dimidiata can be distinguished from each other by characteristics of the pre, meso and metanotum. The number of setiferous tubercles increases progressively among instars. The sulcus stridulatorium of 1st instar nymphs is amorphous, showing median parallel grooves; from the 2nd instar on the sulcus is, progressively, elongate, deep and posteriorly pointed with stretched parallel grooves. All instars have a trichobothrium on the apical 1/3 of segment II of the antenna. The opening of the Brindley’s gland is on the mesopleura. Fifth instar nymphs have an apical ctenidium on the ventral surface of the fore tibia. Dorsal glabrous patches are found on the lateral 1/3 of abdomen. Bright oval patches are found on the ventral median line of the abdomen, from segment IV-VI; 1st instar nymphs lack these patches. Abdominal dorsal plates are present from the 1st-5th instars; the 1st instar also contains a rectangular plate in segment IX. From the 2nd instar on, variably-shaped plates are present on segments VII to IX. Morphometric data were also obtained and proved to be useful for distinguishing T. dimidiata instars.
Keywords: Chagas Disease
Vectors
morphology
Systematics
keywords: Doença de Chagas
Vetores
Morfologia
Sistemática
Issue Date: 2009
Publisher: Fundação Oswaldo Cruz. Instituto Oswaldo Cruz
Citation: MELLO, F.; JURBERG, J.; GRAZIA, J. Morphological study of the eggs and nymphs of Triatoma dimidiata (Latreille, 1811) observed by light and scanning electron microscopy (Hemiptera: Reduviidae: Triatominae). Mem Inst Oswaldo Cruz, v.104, n.8, p.1072-1082, Dec. 2009.
ISSN: 0074-0276
Copyright: open access
Appears in Collections:IOC - Artigos de Periódicos

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