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1.
J Med Entomol ; 58(1): 486-488, 2021 01 12.
Artigo em Inglês | MEDLINE | ID: mdl-32845963

RESUMO

Morphology of cimicid eggs are scarce, and this is the first record for the genus Ornithocoris Pinto, 1927 (Hemiptera: Cimicidae), using scanning electron microscopy (SEM). This genus comprises two species: Ornithocoris toledoi Pinto, 1927 (Hemiptera: Cimicidae) and Ornithocoris pallidus (Usinger, 1959). The eggs of O. pallidus are ellipsoid, and an evident 'lateral flattening', which may give clear asymmetry from the longitudinal axis. The exochorion of the body of the egg and operculum of O. pallidus present spherical or polygonal structures in relief, and pseudomicropyles on the border of the operculum, both differing from Cimex lectularius. The internal face of the operculum is smooth and the border also presented three layers. It was not possible to observe micropyles in the egg of O. pallidus. Bed bugs have a great psychological impact on people, and some people can develop a more or less severe allergic reaction against the bite. Successful control of bed bugs needs serious organization. Studies on egg morphology will add more information to assist in taxonomy studies of O. pallidus and can serve as a basis for control studies because eggs are resistant to insecticides.


Assuntos
Cimicidae/ultraestrutura , Animais , Cimicidae/crescimento & desenvolvimento , Microscopia Eletrônica de Varredura , Óvulo/crescimento & desenvolvimento , Óvulo/ultraestrutura
2.
Am J Trop Med Hyg ; 89(4): 775-80, 2013 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-23958911

RESUMO

The present study focused on spermatophore structure, transfer, and subsequent destination inside bloodfeeding females of the species Triatoma infestans and Rhodnius neglectus. The morphology of the spermatophore differed between the species studied, such that in T. infestans, the shape was ovaloid, whereas in R. neglectus, the shape resembled a rod. Structures' spine-like cuticulars distributed across the inner surface of the vagina of both species were observed; however, the role of these cuticulars is unknown in Triatominae. In both species, there was an opening in the spermatophore exactly where the common oviduct is connected, thereby making it possible to confirm that the process of spermatozoid migration takes place through this opening. The results obtained show that the spermatophores of T. infestans and R. neglectus differ in size, shape, and structure. Therefore, they can be used as taxonomic markers and may provide information regarding physiology and evolution.


Assuntos
Doença de Chagas/transmissão , Genitália Feminina/ultraestrutura , Triatominae/ultraestrutura , Animais , Feminino , Insetos Vetores , Comportamento Sexual Animal , Triatominae/fisiologia
3.
J Insect Sci ; 12: 65, 2012.
Artigo em Inglês | MEDLINE | ID: mdl-22938518

RESUMO

Because of the morphological and morphometric variation of testicular follicles in different genera of the subfamily Triatominae, it was of interest to associate those parameters with the different medial pronotal band patterns (wide and narrow) found in Rhodnius brethesi (Matta) (Hemiptera: Reduviidae). This is a wild species often associated with Leopoldina piassaba Wallace (Arecales: Arecaceae) palm, with a geographical distribution restricted to the Amazon region. The specimens used were from the state of Amazonas, and were kept under conditions of 29 ± 1 °C, 80 ± 5% RH, 12:12 L:D photoperiod, and were fed weekly on blood from Swiss mice. Three-day-old fasting males were separated in accordance with the patterns of the medial pronotal band, dissected, and the testicles removed. After removal of the testicular membrane, the follicles were spread, drawn by camera lucida, and measured. The results showed that the testis of R. brethesi consists of seven follicles, divided into two groups by length; two long and five short. In specimens with a wide medial pronotal band, the long follicles were 5.4 mm in length, but in specimens with a narrow medial band, the long follicles were 5.64 mm in length. The difference was significant. The short follicles were not different in length, suggesting the presence of a possible complex "brethesi" in the Amazon region.


Assuntos
Rhodnius/anatomia & histologia , Variação Anatômica , Animais , Brasil , Masculino , Camundongos , Pigmentação , Testículo/anatomia & histologia
4.
J Med Entomol ; 48(3): 496-503, 2011 May.
Artigo em Inglês | MEDLINE | ID: mdl-21661307

RESUMO

The male accessory glands in Triatoma are tubular and produce substances with some functions related to production of the spermatophore. In the current study, the cytochemistry of male accessory glands was evaluated in starved Triatoma brasiliensis and adult Triatoma melanica. The storage of carbohydrates and proteins in T. melanica male accessory glands occurs earlier than in T. brasiliensis. In addition, the occurrence of eletron-lucent granules without carbohydrates and proteins suggests that other substances are released by these glands, which may be used for lubrication of the male genitalia. Male T. brasiliensis has more intense secretory activity in the fifth day of adult life, which may indicate a higher reproductive capacity. The analysis of lipid production in male accessory glands can contribute to the knowledge of spermatophore formation in these species.


Assuntos
Triatoma/ultraestrutura , Estruturas Animais/metabolismo , Estruturas Animais/ultraestrutura , Animais , Carboidratos/biossíntese , Genitália Masculina/metabolismo , Genitália Masculina/ultraestrutura , Proteínas de Insetos/metabolismo , Lipídeos/biossíntese , Masculino , Microscopia Eletrônica de Transmissão , Biossíntese de Proteínas , Reprodução , Triatoma/metabolismo
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