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Search Results: 1 - 10 of 29471 matches for " Felipe Arley Costa;Queiroz "
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External morphology of sensory structures of fourth instar larvae of neotropical species of phlebotomine sand flies (Diptera: Psychodidae) under scanning electron microscopy
Pessoa, Felipe Arley Costa;Queiroz, Raul Guerra de;Ward, Richard Douglas;
Memórias do Instituto Oswaldo Cruz , 2001, DOI: 10.1590/S0074-02762001000800013
Abstract: in the present study, some morphological structures of antennae, maxillary palps and caudal setae of fourth instar larvae of laboratory-reared phlebotomine sand flies (lutzomyia longipalpis, l. migonei, l. evandroi, l. lenti, l. sericea, l. whitmani and l. intermedia) of the state of ceará, brazil, were examined under scanning electron microscopy. the antennal structures exhibited considerable variation in the morphology and position. a prominent digitiform distal segment has been observed only on the antenna of species of the subgenus nyssomyia. the taxonomic relevance of this and other antennal structure is discussed. the papiliform structures found in the maxillae and the porous structures of the caudal setae of all species examined may have chemosensory function. further studies with transmission electron microscopy are needed to better understand the physiological function of these external structures.
Posterior spiracles of fourth instar larvae of four species of phlebotomine sand flies (Diptera: Psychodidae) under scanning electron microscopy
Pessoa, Felipe Arley Costa;Queiroz, Raul Guerra de;Ward, Richard Douglas;
Memórias do Instituto Oswaldo Cruz , 2000, DOI: 10.1590/S0074-02762000000500013
Abstract: in the present study, posterior spiracles of laboratory-reared fourth instar larvae of lutzomyia longipalpis, l. migonei, l. lenti, and l. whitmani (diptera: psychodidae) of the state of ceará, brazil, were examined under scanning electron microscopy. the number of papillae of spiracles examined varied according to the species examined, but no intraspecific differences were found. the importance of this structure to sand fly larva identification and phylogeny is commented.
External morphology of sensory structures of fourth instar larvae of neotropical species of phlebotomine sand flies (Diptera: Psychodidae) under scanning electron microscopy
Pessoa Felipe Arley Costa,Queiroz Raul Guerra de,Ward Richard Douglas
Memórias do Instituto Oswaldo Cruz , 2001,
Abstract: In the present study, some morphological structures of antennae, maxillary palps and caudal setae of fourth instar larvae of laboratory-reared phlebotomine sand flies (Lutzomyia longipalpis, L. migonei, L. evandroi, L. lenti, L. sericea, L. whitmani and L. intermedia) of the State of Ceará, Brazil, were examined under scanning electron microscopy. The antennal structures exhibited considerable variation in the morphology and position. A prominent digitiform distal segment has been observed only on the antenna of species of the subgenus Nyssomyia. The taxonomic relevance of this and other antennal structure is discussed. The papiliform structures found in the maxillae and the porous structures of the caudal setae of all species examined may have chemosensory function. Further studies with transmission electron microscopy are needed to better understand the physiological function of these external structures.
Posterior spiracles of fourth instar larvae of four species of phlebotomine sand flies (Diptera: Psychodidae) under scanning electron microscopy
Pessoa Felipe Arley Costa,Queiroz Raul Guerra de,Ward Richard Douglas
Memórias do Instituto Oswaldo Cruz , 2000,
Abstract: In the present study, posterior spiracles of laboratory-reared fourth instar larvae of Lutzomyia longipalpis, L. migonei, L. lenti, and L. whitmani (Diptera: Psychodidae) of the State of Ceará, Brazil, were examined under scanning electron microscopy. The number of papillae of spiracles examined varied according to the species examined, but no intraspecific differences were found. The importance of this structure to sand fly larva identification and phylogeny is commented.
A new species of Cerqueirellum Py-Daniel, 1983 (Diptera: Simuliidae) and proven new vector of mansonelliasis from the Ituxi River, Amazon basin, Brazil
Pessoa, Felipe Arley Costa;Barbosa, Ulysses Carvalho;Medeiros, Jansen Fernandes;
Acta Amazonica , 2008, DOI: 10.1590/S0044-59672008000300022
Abstract: a new species of the genus cerqueirellum py-daniel, 1983 (diptera: simuliidae) is described. the adults are similar to the species c. oyapockense (floch & abonnenc, 1946) and c. roraimense (nunes de mello, 1974), of which the females are similar, and the males present discrete differences. the main differences of this new species to others of the genus cerqueirellum are the integument of the larva recovered from stout spines and long cephalic trichomes in the pupa. some females were infected with mansonella ozzardii (manson, 1897) (nematoda, onchocercidae) and probably transmit mansonelliasis in the ituxi river, state of amazonas, brazil.
Simuliidae (Diptera:Culicomorpha) no Brasil XI - Shelleyellum gênero novo
Py-Daniel, Victor;Pessoa, Felipe Arley Costa;
Acta Amazonica , 2005, DOI: 10.1590/S0044-59672005000400012
Abstract: a new neotropical genus of simuliids is characterized based on species previously included in the "siolii group" of psaroniocompsa genus. identifications keys for immature stages are presented. shelleyellum genus is constituted by the species: s. damascenoi (py-daniel,1988), s. guaporense (py-daniel, 1989), s. lourencoi (py-daniel, 1988), s. siolli (py-daniel, 1988), s. tergospinosum (hamada, 2000). the genus is mainly characterized by longitudinal carina in male distimere and the presence of tegumentary tubercles in the larvae.
Importancia do método de gota espessa de sangue no diagnóstico de filárias simpátricas no Amazonas, Brasil
Medeiros, Jansen F;Pessoa, Felipe Arley Costa;Martins, Marilaine;
Acta Amazonica , 2010, DOI: 10.1590/S0044-59672010000400020
Abstract: in this work, the visual diagnostic methods for human filarias in the blood are evaluated. the thick blood film method is more faithful to identify the microfilariae species if compared to policarbonate membrane filtration and knott methods, especially in areas where more than one species occur, as in amazon basin. slides with mansonella ozzardi microfilariae were mounted and photographed by different diagnosis methods. the thick blood film method is much easier to see the diagnostic morphological characters as cephalic and caudal space, pattern of nucleation of the tail and tail shape that can separate the blood amazonian microfilariae species.
Effects of timber harvest on phlebotomine sand flies (Diptera: Psychodidae) in a production forest: abundance of species on tree trunks and prevalence of trypanosomatids
Pessoa, Felipe Arley Costa;Medeiros, Jansen Fernandes;Barrett, Toby Vincent;
Memórias do Instituto Oswaldo Cruz , 2007, DOI: 10.1590/S0074-02762007005000075
Abstract: the amazon forest is being exploited for timber production. the harvest removes trees, used by sand flies as resting sites, and decreases the canopy, used as refuges by some hosts. the present study evaluated the impact of the timber harvest, the abundance of sand flies, and their trypanosomatid infection rates before and after selective logging. the study was accomplished in terra-firme production forest in an area of timber harvest, state of amazonas, brazil. sand fly catches were carried out in three areas: one before and after the timber harvest, and two control areas, a nature preservation area and a previously exploited area. the flies were caught by aspiration on tree trunks. samples of sand flies were dissected for parasitological examination. in the site that suffered a harvest, a larger number of individuals was caught before the selective extraction of timber, showing significant difference in relation to the number of individuals and their flagellate infection rates after the logging. the other two areas did not show differences among their sand fly populations. this fact is suggestive of a fauna sensitive to the environmental alterations associated with selective logging.
Type species designation of Shelleyellum Py-Daniel & Pessoa, 2005 (Diptera: Simuliidae)
Py-Daniel Victor,Pessoa Felipe Arley Costa
Acta Amazonica , 2006,
Abstract:
Cladistic analysis of the Neotropical genera Cerqueirellum Py-Daniel, 1983, Coscaroniellum Py-Daniel, 1983 and Shelleyellum Py-Daniel & Pessoa, 2005 (Diptera: Simuliidae)
Pessoa, Felipe Arley Costa;Py-Daniel, Victor;Ríos Velásquez, Claudia Maria;
Acta Amazonica , 2008, DOI: 10.1590/S0044-59672008000300021
Abstract: females of simuliid black flies are haematophagous insects and vectors of several pathogenic agents of human diseases such as the filarial worms mansonella ozzardi and onchocerca volvulus. the genus cerqueirellum is one of the most important groups of vectors of mansonellosis and onchocerciasis diseases in south america, and the genera coscaroniellum and shelleyellum are phylogenetically close to cerqueirellum. there is not yet an agreement among authors about the generic classification of the species which compose these three genera, being all lumped by some taxonomists within psaroniocompsa. a cladistic analysis of all species of coscaroniellum, cerqueirellum, and shelleyellum, based on 41 morphological characters were done. species closely related to cerqueirellum were included in the analysis. the genera cerqueirellum, coscaroniellum and shelleyellum were demonstrated as consistent basal entities and well-defined monophyletic clades.
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