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DESCRIPTION OF ADULTS AND NYMPH, AND REDESCRIPTION OF THE LARVA, OF ORNITHODOROS MARINKELLEI (ACARI: ARGASIDAE), WITH DATA ON ITS PHYLOGENETIC POSITION

LABRUNA, Marcelo B.; NAVA, Santiago; TERASSINI, Flavio A.; ONOFRIO, Valeria C.; BARROS-BATTESTI, Darci M.; CAMARGO, Luis Marcelo A.; VENZAL, Jose Manuel
Fonte: AMER SOC PARASITOLOGISTS Publicador: AMER SOC PARASITOLOGISTS
Tipo: Artigo de Revista Científica
ENG
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The argasid tick Ornithodoros marinkellei Kohls, Clifford, and Jones, 1969 was described 4 decades ago based on larval specimens collected from bats (Pteronotus spp.) in Colombia and Panama. Thereafter, larval O. marinkellei parasitizing bats were reported from Venezuela, Guyana, and Brazil. Herein, we describe the adults and nymph, and redescribe the larva of O. marinkellei based on specimens recently collected in the western Brazilian Amazon region. In contrast to all other known adult argasids, the idiosoma of both males and females of O. marinkellei is covered with sclerotized plaques. The idiosoma of the nymph of O. marinkellei is entirely micromamillated, and differs from the adults by the absence of plaques. The larva of O. marinkellei is morphologically similar to the larvae of the 2 other species belonging to the subgenus Subparmatus, i.e., Ornithodoros viguerasi Cooley and Kohls, 1941 and Ornithodoros mormoops Kohls, Clifford, and Jones, 1969. Because of the long and narrow dorsal plate, the larva of O. marinkellei is readily distinguished from O. viguerasi and O. mormoops. Comparison of our larvae from Brazil with O. marinkellei paratype specimens from Colombia confirmed their taxonomic identification. However, a few morphological differences...

The nymph of Tortopus harrisi Traver (Ephemeroptera: Polymitarcyidae)

MOLINERI, Carlos; SIEGLOCH, Ana E.; RIGHI-CAVALLARO, Karina O.
Fonte: MAGNOLIA PRESS Publicador: MAGNOLIA PRESS
Tipo: Artigo de Revista Científica
ENG
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Polymitarcyidae is a family of burrowing mayflies (Ephemeroptera: Ephemeroidea) distributed throughout the world but with highest diversity in the Neotropics. Tortopus Needham & Murphy, with a Panamerican distribution, is known from twelve species described in the adult stage. Nymphs are only known for three species: T. puella (Pictet), T. obscuripennis Dominguez and T. sarae Dominguez, and present a rather homogeneous morphology (Molineri 2008). They were firstly described for T. puella by Scott et al. (1959) and later Molineri (2008) described the other two. Both studies reported that these species burrow U-shaped tunnels in clay banks of rivers and streams, thus preventing them from being sampled in most limnological studies (that use surbers, drags, or drift nets). The aim of the present contribution is to describe and illustrate the previously unknown nymph of Tortopus harrisi Traver that shows important anatomical differences with the other nymphs known in the genus. This morphological differentiation suggests a different habitat use by these nymphs, sampled with drag and surber samplers in sandy substrate. New locality records are given for T. harrisi in Brazil. The nymphs are preserved in alcohol, mouthparts, legs and genital rudiments were mounted in microscope slides with Canada Balsam. Drawings were made with a camera lucida attached to a stereo microscope. The material is deposited in CUIC (Cornell University Insect Collection...

Composition and diversity of Ephemeroptera (Insecta) nymph communities in the middle section of the Jacui River and some tributaries, southern Brazil

SIEGLOCH, Ana Emilia; FROEHLICH, Claudio Gilberto; KOTZIAN, Carla B.
Fonte: FUNDACAO ZOOBOTANICA RIO GRANDE SUL, MUSEU CIENCIAS NATURAIS Publicador: FUNDACAO ZOOBOTANICA RIO GRANDE SUL, MUSEU CIENCIAS NATURAIS
Tipo: Artigo de Revista Científica
ENG
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The taxonomic composition and diversity of assemblages of Ephemeroptera nymphs of four lotic environments in the central region of State of Rio Grande do Sul, a subtropical area in southern Brazil, were evaluated. Samplings were done monthly, with a Surber sampler, from June 2001 to May 2002, in the Jacui River and three of its tributaries. The total number of nymphs collected in the four sampling sites was 11,007 in five families and 19 genera, of these, 11 are new records for the State. The highest diversity occurred in Point 4 (H` = 2.41) and the lowest in Point 2 (H` = 1.69). Point 4 had the highest environmental stability, conservation of the riparian vegetation and the lowest anthropic impact, while Point 2 presented a large environmental simplification due to a direct anthropic influence ( e. g. domestic sewerage, trampling by cattle). The diversity of nymphs observed in the total area is high, compared to the estimated maximum theoretical diversity; a result of the high evenness and richness recorded. Rarefaction curves, calculated for a sample of 1,018 specimens, showed a similar expectation of richness for the four sampling sites. This result seems to be associated with the overall environmental homogeneity of the region caused by long-term alterations ( land use and deforestation). In summary...

A description of the nymph of Anacroneuria ofaye Froehlich (Plecoptera: Perlidae) and a apparatus for rearing Neotropical stonefly species

Novaes, Marcos Carneiro; Bispo, Pitagoras Da Conceicao; Higuti, Janet
Fonte: MAGNOLIA PRESS; AUCKLAND Publicador: MAGNOLIA PRESS; AUCKLAND
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
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The Neotropical genus Anacroneuria (Perlidae) is represented by more than 300 species. Among the Brazilian Anacroneuria, only the nymphs of two species have been described. In this paper, we described the nymph of A. ofaye Froehlich and an apparatus for rearing this genus. This is the first record of A. ofaye from Parana State, Brazil.; PROTAX-CNPq [562203/2010-9]; FAPESP (State of Sao Paulo Research Foundation) [04/09711-8, 09/53233-7]; CNPq [473246/2004-0, 477349/2007-2, 301652/2008-2, 307577/2011-2]

Performance consequences of food mixing in two passion vine leaf-footed bugs, Holymenia clavigera Herbst, 1784 and Anisoscelis foliacea marginella Dallas, 1852 (Hemiptera : Coreidae); Conseqüências da dieta mista na performance de dois coreídeos do maracujá, Holymenia clavigera Herbst, 1784 and Anisoscelis foliacea marginella Dallas, 1852 (Hemiptera : Coreidae)

Rodrigues, Daniela; Duarte, Leandro da Silva; Moreira, Gilson Rudinei Pires
Fonte: Universidade Federal do Rio Grande do Sul Publicador: Universidade Federal do Rio Grande do Sul
Tipo: Artigo de Revista Científica Formato: application/pdf
ENG
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Holymenia clavigera (Herbst) e Anisoscelis foliacea marginella (Dallas) (Hemiptera: Coreidae: Anisoscelini) ocorrem no sul do Brasil e são hóspedes de diversas espécies de Passifloraceae. Observações preliminares indicam uma alta coexistência destas espécies em termos de uso da planta hospedeira; em adição, ovos e ninfas são extremamente semelhantes. Neste estudo comparou-se a performance das ninfas das duas espécies em passifloráceas nativas silvestres (Passiflora suberosa Linnaeus e Passiflora misera Humbold, Bonpland et Kunth) e cultivadas (Passiflora edulis Sims), oferecidas em separado e conjuntamente. Foram determinadas as taxas de desenvolvimento e mortalidade ninfal, bem como o tamanho do adulto à emergência. As partes das hospedeiras mais utilizadas para alimentação foram registradas. Para ambos os coreídeos, P. suberosa conferiu melhor performance. Ninfas de primeiro instar de ambas as espécies alimentaram- se com maior intensidade da região apical dos ramos quando comparado com as demais partes das plantas. Ambas as espécies mudaram para os frutos verdes no segundo instar, sendo este comportamento mais pronunciado em H. clavigera. Deste modo, além da semelhança morfológica, os imaturos de H. clavigera and A. foliacea marginella são extremamente similares no tangente à interação com suas plantas hospedeiras. Sugere-se que estes coreídeos possam ter evoluído através de vários processos...

A description of the nymph of Anacroneuria ofaye Froehlich (Plecoptera: Perlidae) and a apparatus for rearing Neotropical stonefly species

Novaes, Marcos Carneiro; Bispo, Pitagoras da Conceicao; Higuti, Janet
Fonte: Magnolia Press Publicador: Magnolia Press
Tipo: Artigo de Revista Científica Formato: 71-77
ENG
Relevância na Pesquisa
37.23%
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Processo FAPESP: 04/09711-8; Processo FAPESP: 09/53233-7; The Neotropical genus Anacroneuria (Perlidae) is represented by more than 300 species. Among the Brazilian Anacroneuria, only the nymphs of two species have been described. In this paper, we described the nymph of A. ofaye Froehlich and an apparatus for rearing this genus. This is the first record of A. ofaye from Parana State, Brazil.

Nymphs in foraging populations of Coptotermes gestroi (Isoptera: Rhinotermitidae)

Albino, Erica; Costa-Leonardo, Ana Maria
Fonte: Brill Academic Publishers Publicador: Brill Academic Publishers
Tipo: Artigo de Revista Científica Formato: 427-439
ENG
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Food searching activity by subterranean termites involves workers, soldiers and nymphs. The present study was carried out for elucidating aspects of nymph foraging behavior in Brazil where the species Coptotermes gestroi (Wasmann, 1896) is exotic. Monitoring was conducted through making regular collections from seven different colonies for a period of 22 months, which exhibited the production of forager nymphs all year round. A biometric study was conducted to determine the instars of the forager nymphs collected. The identification of male and female nymphs was also conducted for establishing the sex proportion, which was slightly male-biased. From the 533 forager nymphs collected, 34 were from the 3rd instar, 280 from the 4th instar and 219 from 5th instar. The results suggest that 3rd instar nymphs were not too active in the foraging activities because they were collected only in one colony and in an insignificant quantity. (C) Koninklijke Brill NV, Leiden, 2011.

Development of resistance to nymphs of Amblyomma cajennense ticks (Acari:Ixodidae) in dogs

Mukai, Luciana S.; Castro Netto, A.; Szabó, M. P J; Bechara, G. H.
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Conferência ou Objeto de Conferência Formato: 180-183
ENG
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Ticks have long been regarded as constraints to humans and domestic animals, but hosts often develop resistance to ticks after repeated infestations. The purpose of this investigation was to study the possible acquisition of immunity in domestic dogs to nymphs of A. cajennense by determining the tick alimentary performance after successive controlled infestations. Mean engorged weight of nymphs was not significantly different among the three infestations; molting rate from nymph to adult ticks, and the percentage of nymph recovery were also very close in all infestations. These results are similar to those obtained in studies of the dog-adult Rhipicephalus sanguineus interface. It is concluded that domestic dogs do not develop resistance against nymphs of A. cajennense ticks.

Estudo biológico e biométrico dos estádios ninfais de Rhodnius prolixus Stäl, 1859 (Hemiptera, Reduviidae) sob condições laboratoriais

Marconato, E.; Ponsoni, E. J.; Barata, J. M S; Da Rosa, João Aristeu
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 157-161
POR
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Eggs and nymphs originated from couples of Rhodnius prolixus obtained from nymphs of the 5th instar were used for biological cycle and biometric studies. The following biological cycle parameters were determined under a temperature of 28°C and relative humidity, varying between 52 - 94% : medium period of incubation: 13.01 days; rate of eggs eclosion: 77.6%; medium period of development of the 1st, 2nd, 3rd, 4 th, 5th instar nymphs : 19.33, 19.09, 20.38, 24.37, 38.14 days, respectively; percentual of deaths in the nymph instar: 26.70, 14.00, 18.26, 17.02, 35.47% respectively; percentual of changes per instar nymphs; 73.30, 86.03, 81.73, 82.97, 64.52%, respectively. Biometric measurements performed, showed that in all the instars the abdomen is the largest segment. In the four first instars, the head is larger than the thorax. In the fifth instar, the head and thorax present are about the same size.; A partir de ninfas de 5o estádio obtiveram-se casais de Rhodnius prolixus, que originaram ovos e ninfas para estudos de ciclo biológico e biométrico. Foram determinados os seguintes parâmetros do ciclo biológico à temperatura de 28OC e umidade relativa do ar variando entre 52 e 94%: período médio de incubação dos ovos: 13,01 dias; taxa de eclosão dos ovos: 77...

Morphological description of the nymphal stage of Amblyomma geayi and new nymphal records of Amblyomma parkeri

Martins, Thiago F.; Scofield, Alessandra; Oliveira, Wanessa B.L.; Nunes, Pablo H.; Ramirez, Diego G.; Barros-Battesti, Darci M.; Sá, Lilian R.M.; Ampuero, Fernanda; Souza, Julio C.; Labruna, Marcelo B.
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 181-184
ENG
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The external morphology of the nymph of Amblyomma geayi Neumann is described by optical and scanning electron microscopy. Unfed nymphs were obtained from an engorged A. geayi female, which had been collected on a sloth (Bradypus variegatus) from Belém municipality, State of Pará, northern Brazil, and was kept under laboratory conditions. With the present description, we propose a modification of a taxonomic key published in 2010 for the Amblyomma nymphs that occur in Brazil, through the inclusion of A. geayi. The nymph of A. geayi is morphologically very similar to the nymph of Amblyomma parkeri Fonseca and Aragão, with only slight morphological differences related to scutal surface and punctuations (more shagreened and less punctuated in A. geayi). These 2 nymphs differ from all other known Amblyomma nymphs from Brazil by the combination of auriculae present as small posterolateral rounded projections, eyes located at the level of the scutal midlength, and a rounded hypostome. These nymphal similarities as well the morphology of the adult stage corroborate previous studies that showed that A. geayi and A. parkeri are genetically closely related. Unpublished host records of the nymphs of both A. geayi and A. parkeri are provided. Established populations of A. geayi and A. parkeri seem to be geographically separated...

A Description of the nymph of Anacroneuria ofaye (Plecoptera: Perlidae) and a rearing apparatus for rearing Neotropical stonefly species

Novaes, Marcos Carneiro; Bispo, Pitágoras da Conceição; Higuti, Janet
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 71-77
ENG
Relevância na Pesquisa
37.23%
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Processo FAPESP: 2004/09711-8; Processo FAPESP: 2009/53233-7; The Neotropical genus Anacroneuria (Perlidae) is represented by more than 300 species. Among the Brazilian Anacroneuria, only the nymphs of two species have been described. In this paper, we described the nymph of A. ofaye Froehlich and an apparatus for rearing this genus. This is the first record of A. ofaye from Paraná State, Brazil.; O gênero neotropical Anacroneuria (Perlidae) é representado por mais de 300 espécies. Entre os Anacroneuria brasileiros, apenas as ninfas de duas espécies foram descritas. Neste trabalho, descrevemos a ninfa de A. ofaye Froehlich e um aparato para criação deste gênero. Este é o primeiro registro de A. ofaye no Estado do Paraná, Brasil.

Nymph and adult biology and seasonal abundance of Loxa deducta (Walker) on privet, Ligustrum lucidum

Panizzi,Antônio R.; Mourão,Ana P. M.; Oliveira,Émerson D. M.
Fonte: Sociedade Entomológica do Brasil Publicador: Sociedade Entomológica do Brasil
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/1998 EN
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Laboratory and field studies indicated that privet, Ligustrum lucidum (Oleaceae), is an important host plant of the neotropical stink bug, Loxa deducta (Walker) (Hemiptera: Pentatomidae) in northern Paraná state. Survivorship of nymphs was high (82.9%) when fed immature fruits of privet. Nymph developmental time (from the 2nd stadium to adult) lasted » 49 d. At adult emergence, females attained greater (199.5 mg) fresh body weight than males (180.0 mg). Survivorship of adult L. deducta decreased gradually with time. Mean total longevity was » 62 d for females and » 55 d for males. Of 30 females observed, 25 (83.3%) oviposited when fed fruits of privet. The preoviposition period was 13.9 (± 0.51) d; fecundity was 17.8 (± 1.60) egg masses/female, and 236.0 (± 21.98) eggs/female; egg hatchability was 65.0 (± 6.48)%. Considering the total period of 4-wks, the percentage increase in fresh body weight was » 70% for females, and » 45% for males. During summer months (December to February), relatively low numbers of insects were collected on privet. During March, nymph and adult populations increased reaching a peak during April...

Nymph and adult biology of Dichelops melacanthus (Dallas) (Heteroptera: Pentatomidae) feeding on cultivated and non-cultivated host plants

Chocorosqui,Viviane R.; Panizzi,Antônio R.
Fonte: Sociedade Entomológica do Brasil Publicador: Sociedade Entomológica do Brasil
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/08/2008 EN
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The biology of the pentatomid Dichelops melacanthus (Dallas) feeding on cultivated and non-cultivated plants was studied in the laboratory. Nymph mortality varied from ≈ 60 on corn (seed mature) to 77% on wheat (ear immature); no nymphs survived on seedlings of corn or wheat. Nymph developmental time on soybean, corn or wheat (seed, pod or ear) varied from 25.5 to 32.8 days. Body weight at adult emergence was similar and greater on most foods than on wheat ear. Nymphs fed preferentially on soybean (pod immature). On non-cultivated hosts, nymphs showed high mortality (73%) on crotalaria (pod immature); on tropical spiderwort (stem) all nymphs died. Nymphs took longer time to develop on crotalaria and/or on spiderwort than on soybean. Body weight at adult emergence did not differ on crotalaria or soybean. Survivorship decreased with time on most foods, with ≈50% of adults alive at day 30. On corn and wheat seedlings ≈80% of adults were dead on day 20. Adult longevity ranged 31-43 days, except on corn and wheat seedlings < 15 days. Females % ovipositing peaked (≈76%) on soybean (pod or seed immature), and was minimum (≈9%) on wheat ear (immature); no females reproduced on seedlings of corn or wheat. Preoviposition period was shorter (≈12 days) on soybean (immature pod or seed) and longer (≈37 days) on wheat (ear immature). Fecundity was similar and higher on all foods than on wheat (ear immature). Body weigh gain occurred on all foods...

Performance consequences of food mixing in two passion vine leaf-footed bugs, Holymenia clavigera (Herbst, 1784) and Anisoscelis foliacea marginella (Dallas, 1852) (Hemiptera; Coreidae)

Rodrigues,D.; Duarte,LS.; Moreira,GRP.
Fonte: Instituto Internacional de Ecologia Publicador: Instituto Internacional de Ecologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/02/2007 EN
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27.4%
Holymenia clavigera (Herbst) and Anisoscelis foliacea marginella (Dallas) (Hemiptera: Coreidae: Anisoscelini) are distributed in southern Brazil and use various passion vine species (Passifloraceae) as host-plants. Preliminary observations indicate a high coexistence of these species in terms of host-plant use; in addition, there is a strong similarity regarding egg and nymph morphology. In this study, the most suitable feeding sites for nymph performance on wild (Passiflora suberosa Linnaeus and Passiflora misera Humbold, Bonpland et Kunth) and cultivated (Passiflora edulis Sims) hosts were determined by rearing them on each host and on the combination of hosts. Performance was determined by evaluating nymph development and survivorship, and adult size at emergence. Plant parts used were also recorded. For both species, P. suberosa was the most suitable host plant. First instar nymphs of both species fed on terminal buds more frequently when compared to other plant parts. Second instar nymphs switched to green fruits, whose behavior was more pronounced for H. clavigera. Thus, H. clavigera and A. foliacea marginella immatures are extremely similar in terms of host-plant use and consequences for performance, in addition to their morphological similarity. We suggest that these coreids may have evolved through several processes...

ON THE NYMPH AND PROSOPON OF THE TSUTSUGAMUSHI, LEPTOTROMBIDIUM AKAMUSHI, N. SP. (TROMBIDIUM AKAMUSHI BRUMPT), CARRIER OF THE TSUTSUGAMUSHI DISEASE

Nagayo, Mataro; Miyagawa, Yoneji; Mitamura, Tokushiro; Imamura, Arao
Fonte: The Rockefeller University Press Publicador: The Rockefeller University Press
Tipo: Artigo de Revista Científica
Publicado em 01/02/1917 EN
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Nomenclature. As mentioned above, the prosopon and the nymph of the tsutsugamushi have many characteristics which distinguish it from the other trombidia. These are the pale color and small size of the body, delicacy of the skin, the conspicuous constriction between the cephalothoracic region and the abdomen, rudimentary eyes and tracheal openings, absence of tracheal capillaries, etc. The fact that the thumb or the appendage of the palpus does not start from the side of the fourth joint of the latter but from its end, is another charac teristic which does not occur in other trombidia. From the biological point of view two facts should be mentioned; i.e., the adult female does not deposit eggs in heaps, and in contrast to those of other species, the larvaæ hatch out all through the year and feed on mammals. From these characteristics running through all the stages of development, we believe that we are justified in claiming a new genus for the tsutsugamushi. We therefore propose to change the scientific name given to this mite by Brumpt in 1910, Trombidium akamushi, and to introduce instead, according to the suggestion of Drs. Goto and Watase, the name Leptotrombidium akamushi. Determinaton of Leptotrombidium akamushi, N. Sp. Prosopon and Nymph. 1. Pale color. 2. Delicacy of the skin. 3. Distinct constriction between the cephalothoracic region and the abdomen. 4. Rudimentary...

Water and Food Relationship of the Eggs and First Instar Nymph of Eurygaster integriceps with the Aid of P32

Quraishi, Sayeed M.
Fonte: Oxford University Press Publicador: Oxford University Press
Tipo: Artigo de Revista Científica Formato: text/html
EN
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A study has been made of the eggs and first instar nymphs of Eurygaster integriceps Puton. The eggs can withstand extreme dry conditions and can develop in a desiccator of CaCl2. In order to moult, the nymph must feed, though the food may consist only of water absorbed in a filter paper. The length of life of a starving nymph shows positive correlation with humidity.

Nymph Growth and Development, Oviposition, and Seed Damage on Cowpea by Lygus hesperus (Heteroptera: Miridae)

Bosque-Perez, Nilsa A.; Leigh, Thomas F.; Foster, Ken W.; Duffey, Sean S.
Fonte: Oxford University Press Publicador: Oxford University Press
Tipo: Artigo de Revista Científica Formato: text/html
EN
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Twenty cowpea genotypes were tested for resistance to Lygus hesperus Knight. During 1982, we measured the effect of these genotypes on nymph survival and growth, and ovipositional preference. Susceptibility of the 20 genotypes to Lygus-induced seed damage was also measured in both natural field and caged adult female infestations. Nymph growth and seed damage were evaluated again in 1983. Significant reductions in nymph growth were measured on 8 of the 20 entries when compared with the susceptible standard ‘California Blackeye 5’ (CB5). The two genotypes exerting greatest reduction on nymph growth were PI 170861 and PI 148674. Oviposition by Iygus bugs was significantly lower on ‘KR78-3-2’ and PI 367925 than on ‘CB5’. Mean numbers of seeds damaged by Iygus bugs were significantly lower for the cowpea acquisitions ‘New Era’, PI 227829, and ‘CR17-1-13’ than for ‘CBS’ in both free-choice and no-choice experiments. Several of these cowpea acquisitions appear to be good genetic sources for developing improved varieties with resistance to lygus bugs.

New records of Amblyomma goeldii (Acari: Ixodidae) and description of the nymphal stage

Martins, Thiago F.; Gianizella, Sergio L.; Nunes, Pablo H.; Faria, Diogo C. L. O.; Do Nascimento, Carlos A. R.; Abrahao, Carlos R.; Miranda, Flavia R.; Teixeira, Rodrigo H. F.; Ramirez, Diego G.; Barros-Battesti, Darci M.; Labruna, Marcelo B.
Fonte: Magnolia Press Publicador: Magnolia Press
Tipo: Artigo de Revista Científica Formato: 439-444
ENG
Relevância na Pesquisa
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Since its original description from the Amazonian region, the tick species Amblyomma goeldii Neumann, 1899 has been misidentified with Amblyomma rotundatum Koch, 1844 in different countries of the Neotropical region. Because of this, some authors have considered that the only confirmed records of A. goeldii were from French Guyana. Herein, we reviewed all specimens of A. goeldii that have been deposited at two tick collections in Brazil. In addition, we describe the nymphal stage of A. goeldii for the first time. A total of 10 unpublished records of the adult stage of A. goeldii are recorded from the Amazonian region of Brazil, confirming the occurrence of A. goeldii in this country. Except for one record on the snake Boa constrictor Linnaeus, all records of A. goeldii reported in the present study were from anteaters (Pilosa: Myrmecophagidae). Our results, in conjunction with previous literature records, indicate that anteaters and large snakes are important hosts for the adult stage of A. goeldii. The nymph of A. goeldii is morphologically similar to the nymphs of Amblyomma romitii Tonelli-Rondelli...

Development of resistance to nymphs of Amblyomma cajennense ticks (Acari : Ixodidae) in dogs

Mukai, Luciana S.; Castro Netto, A.; Szabó, M. P J; Bechara, G. H.
Fonte: New York Acad Sciences Publicador: New York Acad Sciences
Tipo: Conferência ou Objeto de Conferência Formato: 180-183
ENG
Relevância na Pesquisa
27.23%
Ticks have long been regarded as constraints to humans and domestic animals, but hosts often develop resistance to ticks after repeated infestations. The purpose of this investigation was to study the possible acquisition of immunity in domestic dogs to nymphs of A. cajennense by determining the tick alimentary performance after successive controlled infestations. Mean engorged weight of nymphs was not significantly different among the three infestations; molting rate from nymph to adult ticks, and the percentage of nymph recovery were also very close in all infestations. These results are similar to those obtained in studies of the dog-adult Rhipicephalus sanguineus interface. It is concluded that domestic dogs do not develop resistance against nymphs of A. cajennense ticks.

Differentiation and morphogenesis of Triatoma infestans (Klug 1834) female gonads: I - Post embryonic development

Ibañez de Barrett,Cecilia I.; Bozzini,Juan Pablo; Mariano de Bozzini,Marta
Fonte: Biocell Publicador: Biocell
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/2004 EN
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The post-embryonic development of the female gonads in Triatoma infestans (Hemiptera, Heteroptera), insects of importance in health affairs as harbors and vectors of different tripanosomatidea flagellates, is presented in a complete follow-up since insect hatches from the egg up to the last molt in the fifth instar stage. The detailed description of the morphological changes which occur in each instar as well as careful measurements evaluating its size increase have been analyzed by stereomicroscopy, phase contrast, dark field, and oblique illumination, in order to optimize the observations as well the photographic register of gonad morphology and structure. The analysis was performed on gonad specimens obtained from broods no less than twenty (20) nymph bugs, reared at constant temperature and fed-up regularly. According to the results of our study we can assert that gonad differentiation takes place in early phases of the insect development. Such is the case that first instars nymph’s present absolutely and easily recognizably male and female gonads. From the third instar on beside the filament region, the three zones in each ovariole body is distinguished, a differentiation that is more noticeable during the fourth instar where a definite organization is present at the vitelarium. Such a clear cut zone development continues intensively during the fifth instar. Finally at the end of such fifth nymph stage and when the last molt toward adults is prepared...