oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Revis?o do gênero Paramecocephala Benvegnú, 1968 (Heteroptera, Pentatomidae)
Frey-da-Silva, Angélica;Grazia, Jocélia;Fernandes, José Ant?nio Marin;
Revista Brasileira de Entomologia , 2002, DOI: 10.1590/S0085-56262002000200013
Abstract: revision of the genus paramecocephala benvegnú, 1968 (heteroptera, pentatomidae). the neotropical genus paramecocephala benvegnú, 1968 is revised based on morphological characters, particularly of the genitalia of both sexes. formerly monobasic with p. foveata benvegnú, 1968, type species, the genus received two species recently transferred from mecocephala dallas, 1851: m. fusca haglund, 1868 and m. uruguayensis pirán, 1970. five new species are herein described: p. australis frey-da-silva & grazia sp. nov., p. bachmanni frey-da-silva & grazia sp. nov., p. bergrothi frey-da-silva & grazia sp. nov., p. guianensis frey-da-silva & grazia sp. nov. and p. subsolana frey-da-silva & grazia sp. nov. illustrations of the genitalia, a key to the species and a distribution map are provided.
Development, survival and reproduction of Podisus nigrispinus (Dallas, 1851) (Heteroptera: Pentatomidae) with salt and amino acids solutions supplementary diet
Freitas, Simone Patrícia Carneiro;Evangelista Júnior, Walter Santos;Zanuncio, José Cola;Serr?o, José Eduardo;
Brazilian Archives of Biology and Technology , 2006, DOI: 10.1590/S1516-89132006000400013
Abstract: this study presents the effect of a supplementary diet with amino acids and sodium chloride solutions in addition to prey on the development, survival and reproduction of the predator podisus nigrispinus (heteroptera, pentatomidae). both solutions showed deleterious effects on nymph survival, adult weight, female longevity, number of egg masses, eggs per female, eggs per egg mass and nymphs per female besides egg viability of p. nigrispinus when compared with diet with water and prey. when compared with plant supplements in the diet the use of amino acids and salt solutions for mass rearing of p. nigrispinus was inferior.
Photoperiod influence on the biology and phenological characteristics of Dichelops melacanthus (Dallas, 1851) (Heteroptera: Pentatomidae)
Chocorosqui, V. R.;Panizzi, A. R.;
Brazilian Journal of Biology , 2003, DOI: 10.1590/S1519-69842003000400012
Abstract: the influence of the photoperiod on the biology and seasonal morphs of dichelops melacanthus (dallas, 1851) was studied in the laboratory. four different photoperiods (11, 12, 13, and 14 hl = hours of light) were tested, keeping the temperature at 25 ± 1oc and the relative humidity at 65 ± 5%. nymph developmental time tended to be longer under shorter photophases (11 and 12 hl). the 14-hour photophase (long day) resulted in lower nymph mortality rates. females maintained at 13 and 14 hl showed greater weight gain (1st-28th day) than females under 12 hl. d. melacanthus showed reproductive oligopause induced by short photophases, especially when exposed to 11 hl. under 13 and 14 hl, 85% and 65% of females oviposited, respectively, in comparison to 10% and 15% of females ovipositing under 11 and 12 hl, respectively. fecundity (number of egg masses and number of eggs/female) was greater in the longer than under the shorter photophases. seasonal dimorphism induced by photoperiod was observed in d. melacanthus adults. under short-day conditions (11 and 12 hl), adults showed short and rounded shoulder spines, grayish brown abdomen (mainly in 11 hl), high lipid contents, and lower percentage of mature reproductive organs. under long-day conditions (13 and 14 hl), the stink bugs showed greatly developed shoulder spines, green abdomen, low lipid contents, and mature reproductive organs.
Photoperiod influence on the biology and phenological characteristics of Dichelops melacanthus (Dallas, 1851) (Heteroptera: Pentatomidae)  [cached]
Chocorosqui V. R.,Panizzi A. R.
Brazilian Journal of Biology , 2003,
Abstract: The influence of the photoperiod on the biology and seasonal morphs of Dichelops melacanthus (Dallas, 1851) was studied in the laboratory. Four different photoperiods (11, 12, 13, and 14 hL = hours of light) were tested, keeping the temperature at 25 ± 1oC and the relative humidity at 65 ± 5%. Nymph developmental time tended to be longer under shorter photophases (11 and 12 hL). The 14-hour photophase (long day) resulted in lower nymph mortality rates. Females maintained at 13 and 14 hL showed greater weight gain (1st-28th day) than females under 12 hL. D. melacanthus showed reproductive oligopause induced by short photophases, especially when exposed to 11 hL. Under 13 and 14 hL, 85% and 65% of females oviposited, respectively, in comparison to 10% and 15% of females ovipositing under 11 and 12 hL, respectively. Fecundity (number of egg masses and number of eggs/female) was greater in the longer than under the shorter photophases. Seasonal dimorphism induced by photoperiod was observed in D. melacanthus adults. Under short-day conditions (11 and 12 hL), adults showed short and rounded shoulder spines, grayish brown abdomen (mainly in 11 hL), high lipid contents, and lower percentage of mature reproductive organs. Under long-day conditions (13 and 14 hL), the stink bugs showed greatly developed shoulder spines, green abdomen, low lipid contents, and mature reproductive organs.
Revis?o do gênero Antiteuchus Dallas (Heteroptera, Pentatomidae, Discocephalinae)
Fernandes, José Ant?nio Marin;Grazia, Jocélia;
Revista Brasileira de Entomologia , 2006, DOI: 10.1590/S0085-56262006000200004
Abstract: revision of the genus antiteuchus dallas (heteroptera, pentatomidae, discocephalinae). the genus antiteuchus dallas, 1851 composed of 46 species is revised. the genus and the known species are redescribed based on the male external genital structure and some external characteristics of the body. the supraspecific structure is refused and neodine kirkaldy, 1909 is considered synonymous of antiteuchus. the species are split among six new groups here proposed: a. amplus, a. supinatus, a. peruensis, a. tesselatus, a. marmoratus and a. mixtus. eight new species are described: a. amapensis sp. nov., a. beckerae sp. nov., a. doesburgi sp. nov., a. exiguus sp. nov., a. ledeburi sp. nov., a. marini sp. nov., a. melanicus sp. nov. and a. similis sp. nov. nine species and one subspecies are synonymized. antiteuchus varians ruckes, 1964 is considered a junior synonym of a. pallescens st?l, 1868; a. englemani rolston, 1993 of a. amplus (walker, 1867); a. tripterus limbativentris ruckes, 1964 and a. minor engleman, 1983 of a. tripterus (fabricius, 1787); a. fuscus (ruckes, 1959), a. piceus (palisot de beauvois, 1805), a. subgibbus engleman, 1983, a. subimpunctatus ruckes, 1964, a. unicolor (westwood, 1837) and a. variolosus (westwood, 1837) of a. mixtus (fabricius, 1787). antiteuchus tatei (ruckes, 1958) is considered species inquirenda. empicoris marmoreus spinola, 1837 is considered incertae sedis and species inquirenda. the male of a. pictus, so far unknown, is described. identification keys for the males of the species of antiteuchus as well as for the species groups are presented.
Tabelas de fertilidade e de esperan?a de vida de Tynacantha marginata Dallas (Heteroptera, Pentatomidae, Asopinae) alimentado com larvas de Tenebrio molitor L. (Coleoptera, Tenebrionidae) e folhas de Eucalyptus urophylla S.T. Blake
Moreira, Luciano Andrade;Zanuncio, José Cola;Pican?o, Marcelo Coutinho;Bruckner, Claudio Horst;
Revista Brasileira de Zoologia , 1995, DOI: 10.1590/S0101-81751995000200005
Abstract: the objective of this research was to study the effect of feeding on eucalyptus leaves on the life and fecundity tables of tynacantha marginata dallas, 1851 (heteroptera: pentatomidae). higher mortality of this predator occurred during second week of life, when the nymphs were starting second instar. the fecundity table showed that the nymphal period of t. marginata lasted four weeks, with viability of 57,9% and total longevity of 21 weeks. egg oviposition period took 10 weeks. the population parameters (r0, rm and λ) showed a 50.69 times populational increase after one generation.
INFLUENCE OF TEMPERATURE ON NYMPHAL DEVELOPMENT OF Podisus distinctus (DALLAS) (HETEROPTERA: PENTATOMIDAE
Germi Porto Santos,Teresinha Vinha Zanuncio,Genésio Tamara Ribeiro,Evandro Pereira da Silva
CERNE , 2004,
Abstract: The objective of this research was to study the effect of five temperatures (17oC; 21oC; 25oC; 29oC and 33oC) on survival and nymph development of Podisus distinctus (Dallas) (Heteroptera: Pentatomidae) in laboratory. Period of egg incubation decreased with temperature elevation being lower at 29oC and lethal at 33oC. This indicates that superior thermal limit for this species can be found between these temperatures. Optimal temperature for egg viability was 23.7oC. Nymphs of Podisus distinctus completed its development between 17 and 29oC with optimal temperature at 26.3oC with higher nymph viability at intermediate temperatures (19oC and 25oC). Optimal temperature for rearing this predator lay between 25oC and 27oC.
Sperm depletion: a cost for single mated females of Podisus nigrispinus (Dallas, 1851) (Heteroptera: Pentatomidae)
Sousa-Souto, Leandro;Evangelista Júnior, Walter Santos;Lima, Eraldo Rodrigues;Zanuncio, José Cola;Fonseca, Marcy das Gra?as;
Brazilian Archives of Biology and Technology , 2006, DOI: 10.1590/S1516-89132006000700009
Abstract: the aim of this work was to test if egg viability of polyandrous females was increased with increasing number of matings. longevity and reproductive output of females of the predatory stinkbug podisus nigrispinus that were allowed to mate for 0, 1, 2, 3 times or were in the continuous presence of the same male was evaluated. polyandry resulted in diminished sperm depletion. females that had mated three times or that were in continuous presence of a male produced more offspring than females that mated once or twice throughout their lifetime. there was a negative correlation of mating history on female longevity. results indicated that remating, either with same male or with different males were crucial for maximization of the reproductive success of females.
Age-dependent fecundity of Podisus nigrispinus (Dallas) (Heteroptera: Pentatomidae) with sublethal doses of gammacyhalothrin
Pereira, Alexandre Igor Azevedo;Ramalho, Francisco de Sousa;Bandeira, Catarina de Medeiros;Malaquias, José Bruno;Zanuncio, José Cola;
Brazilian Archives of Biology and Technology , 2009, DOI: 10.1590/S1516-89132009000500013
Abstract: podisus nigrispinus (dallas) (heteroptera: pentatomidae) was exposed to gammacyhalothrin to study the stimulatory effect of low concentrations of this pyrethroid. the doses studied were 23.4375, 11.7188, 5.8594, 2.9297, 1.4648, 0.7324 mg.litre-1 and water, as control. the third, fourth, and fifth instars of p. nigrispinus were shorter with all the doses of this insecticide. the survival and longevity of this predator was highest with the lowest doses. the oviposition period of p. nigrispinus decreased as the doses increased. the lowest pre-and postoviposition periods were found with 11.7188 mg.litre-1 of gammacyhalothrin. the dose 0.7324 mg.litre-1 increased the clutch interval. the egg viability was similar between the treatments. the number of eggs per clutch, clutches per female, incubation period, and female body weight were not affected. the hormesis response could be used as a tool for ipm programs, allowing the manipulating parameters of this predator in synergism with this insecticide.
Effect of diet on male reproductive tract of Podisus nigrispinus (Dallas) (Heteroptera: Pentatomidae)
Lemos, W. P;Serr?o, J. E;Ramalho, F. S;Cola Zanuncio, J. C.;Lacerda, M. C.;
Brazilian Journal of Biology , 2005, DOI: 10.1590/S1519-69842005000100012
Abstract: the morphology and histology of the reproductive tract of males of the predator podisus nigrispinus (dallas) fed on different diets were studied. p. nigrispinus was fed on diets of: larvae of alabama argillacea (hübner), tenebrio molitor l., musca domestica l., and an artificial diet. the male reproductive tract, independent of diet, showed testes with intense red coloration in a compact, circular, or slightly oval structure. the vasa deferentia were similar in color to the testes and formed long filaments, which joined with the yellow-cream colored ejaculatory duct. the morphological characteristics of the male reproductive tract were similar under all diets, except for the artificial one. the histological studies demonstrated that independent of the diet the testes of p. nigrispinus were composed of four to six follicles. the testes with six follicles generally had four developed and two atrophied follicles. the morphological and histological differences of the testes of p. nigrispinus when fed with different prey are presented and discussed.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.