17 results on '"Reboredo GR"'
Search Results
2. Toxicity of cypermethrin on the neotropical lacewing Chrysoperla externa (Neuroptera: Chrysopidae).
- Author
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Haramboure M, Francesena N, Reboredo GR, Smagghe G, Alzogaray RA, and Schneider MI
- Subjects
- Animals, Argentina, Behavior, Animal drug effects, Biological Assay, Ecosystem, Insecta growth & development, Insecta physiology, Larva drug effects, Larva growth & development, Larva physiology, Insecta drug effects, Insecticides toxicity, Pyrethrins toxicity
- Abstract
The generalist predator Chrysoperla externa (Neuroptera: Chrysopidae) is distributed in the Neotropical Region and presents a strong potential as a biological control agent due to its easily rearing, high voracity and tolerance to several pesticides. This species feeds on relevant pests such as aphids, whiteflies, trips and various lepidopterans. In Argentina, an indiscriminate chemical control with broad spectrum pesticides is still the first option for controlling pests causing resistance problems and reduction of beneficial organisms. Therefore, it would be desirable that predators or parasitoids develop tolerance or resistance as phytophagous pests for their maintenance in the agricultural ecosystems. The objective of this work was to evaluate the tolerance of C. externo to the pyrethroid cypermethrin by topical exposure in laboratory conditions. The symptoms evaluated were tremors, movement, knockdown, inability to walk due to being glued. Recovery from poisoning symptoms was also evaluated. Six different concentrations of the pesticide, including the full field one, were tested. The exposure method was by topical applications on third larval instar. A low toxicity on larvae at 24 h post-treatment was observed, even at the highest concentration evaluated. Most of treated individuals looked normal at 24 h post-treatment; those who were knocked down showed a complete recovery between 48 and 72 h post-treatment. C externa demonstrated a high tolerance to pyrethroids. This could be due to the activity involved in pyrethroids biotransformation (for example, esterases and mixed-function oxidases), or to a low sensitivity of the molecular target. Future studies should be addressed at biochemical and molecular levels to complete our knowledge about insecticide effects on this predator.
- Published
- 2013
3. High resistance to lipid peroxidation of bird heart mitochondria and microsomes: Effects of mass and maximum lifespan.
- Author
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Gutiérrez AM, Reboredo GR, Mosca SM, and Catalá A
- Subjects
- Animals, Body Size, Columbidae physiology, Coturnix physiology, Ducks physiology, Fatty Acids metabolism, Female, Geese physiology, Heart anatomy & histology, Longevity, Male, Myocardium metabolism, Birds physiology, Lipid Peroxidation, Microsomes metabolism, Mitochondria, Heart metabolism
- Abstract
The aim of this investigation was to study the connection between body size, fatty acid composition and sensitivity to lipid peroxidation of heart mitochondria and microsomes isolated from different size bird species: manon (Lonchura striata), quail (Coturnix coturnix var japonica), pigeon (Columba livia), duck (Cairina moschata) and goose (Anser anser), representing a 372-fold range of body mass. Fatty acids of total lipids were determined using gas chromatography and lipid peroxidation was evaluated with a chemiluminescence assay. The fatty acids present in heart organelles of the different bird species analyzed showed a small number of significant allometric trends. In mitochondria, from the individual fatty acid data, palmitoleic acid (C16:1 n7) increased allometrically (r=0.878), while stearic acid (C18:0) was negatively related to body mass (r=-0.903). Interestingly, none of the calculated fatty acid variables, the average fatty acid saturated, monounsaturated, polyunsaturated (PUFA) and the unsaturation index (UI) was established to show significant body size-related variations. In heart microsomes, the content of C18:0 was significantly smaller (r=-0.970) in the birds of greater size. A significant allometric increase in linoleic acid (C18:2 n6) (r=0.986), polyunsaturated (r=0.990) and UI (r=0.904) was observed in the larger birds. The total n6 fatty acids of heart mitochondria did not show significant differences when it was correlated to body mass of the birds. Moreover, positive allometric relationships were shown for microsomes. The total n3 fatty acids of heart mitochondria and microsomes indicated no significant correlations to body mass of birds. The C16:1 n7, C18:0 in mitochondria and C18:0, C18:2 n6, PUFA, UI and PUFA n6 in microsomes showed significant differences when they were correlated to maximum life span (MLSP) of birds. As light emission=chemiluminescence originated from heart organelles was not statistically significant, a lack of correlation between the sensitivity to lipid peroxidation and body size or maximum life span was obtained. These results indicate that the high resistance of bird hearts to the attack by free radicals is body size-independent and would be related to the preservation of cardiac function.
- Published
- 2009
- Full Text
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4. An allometric study of fatty acids and sensitivity to lipid peroxidation of brain microsomes and mitochondria isolated from different bird species.
- Author
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Gutiérrez AM, Reboredo GR, Mosca SM, and Catalá A
- Subjects
- Animals, Body Size, Fatty Acids chemistry, Fatty Acids isolation & purification, Luminescence, Microsomes chemistry, Mitochondria chemistry, Organ Size, Species Specificity, Birds metabolism, Brain metabolism, Fatty Acids metabolism, Lipid Peroxidation, Microsomes metabolism, Mitochondria metabolism
- Abstract
The objective of this investigation was to examine the relationship between body size, fatty acid composition and sensitivity to lipid peroxidation of mitochondria and microsomes isolated from the brain of different size bird species: manon, quail, pigeon, duck and goose, representing a 372-fold range of body mass. Fatty acids of total lipids were determined using gas chromatography and lipid peroxidation was evaluated using a chemiluminescence assay. The allometric study of the fatty acids present in brain mitochondria and microsomes of the different bird species showed a small number of significant allometric trends. In mitochondria the percentage of monounsaturated fatty acids, was significantly lower in the larger birds (r=-0.965; P<0.008). The significant allometric increase in 18:2 n-6; linoleic acid (r=0.986; P<0.0143), polyunsaturated (r=0.993; P<0.007) and total unsaturated (r=0.966; P<0.034) in brain microsomes but not in mitochondria may indicate a preferential incorporation of this fatty acid in the brain endoplasmic reticulum of the larger bird species. The brain of all birds studied had a high content of docosahexaenoic acid. However brain mitochondria but not microsomes isolated from all the birds analyzed showed a significant decrease of arachidonic and docosahexaenoic acids during lipid peroxidation. The allometric analyses of chemiluminescence were not statistically significant. In conclusion our results show absence of correlation between the sensitivity to lipid peroxidation of brain mitochondria and microsomes with body size and maximum life span.
- Published
- 2008
- Full Text
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5. Non-enzymatic lipid peroxidation of microsomes and mitochondria from liver, heart and brain of the bird Lonchura striata: relationship with fatty acid composition.
- Author
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Gutiérrez AM, Reboredo GR, Mosca SM, and Catalá A
- Subjects
- Animals, Brain Chemistry, Dietary Fats, Liver chemistry, Luminescence, Male, Microsomes chemistry, Microsomes, Liver metabolism, Mitochondria chemistry, Mitochondria, Heart metabolism, Mitochondria, Liver metabolism, Myocardium chemistry, Brain metabolism, Fatty Acids, Unsaturated analysis, Lipid Peroxidation physiology, Liver metabolism, Microsomes metabolism, Mitochondria metabolism, Myocardium metabolism, Passeriformes metabolism
- Abstract
The aim of this study was to examine the fatty acid composition and non-enzymatic lipid peroxidation (LP) of mitochondria and microsomes obtained from liver, heart and brain of Lonchura striata. The percentage of total unsaturated fatty acid was approximately 30-60% in the organelles from all tissues studied. Brain mitochondria and both organelles of liver exhibited the highest percentage of polyunsaturated fatty acid (PUFA) (30 and 18%, respectively). The arachidonic acid (AA) content was 7% in mitochondria of liver and brain and 3% in heart mitochondria. The percentage of docosahexanoic acid (DHA) was 8% in brain mitochondria and approximately 2-3% in heart and liver mitochondria. The peroxidizability index (PI) of brain mitochondria and both organelles from liver was higher than that of organelles from heart and brain microsomes. Liver organelles and brain mitochondria were affected by LP, as indicated by the increase in chemiluminescence and a decrease of AA and DHA. These changes were not observed during LP of brain microsomes and both organelles from heart. These results indicate: 1) PI positively correlates with PUFA percentage and LP; 2) The resistance to LP detected in heart organelles would contribute to the cardiac protection against oxidative damage.
- Published
- 2007
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6. Removal of the uropygial gland does not affect serum lipids, cholesterol and calcium levels in the rock pigeon Columba livia.
- Author
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Montalti D, Gutiérrez AM, Reboredo GR, and Salibián A
- Subjects
- Animals, Calcium metabolism, Columbidae, Exocrine Glands anatomy & histology, Female, Male, Models, Biological, Calcium blood, Cholesterol blood, Exocrine Glands physiology, Lipids blood
- Abstract
The uropygial gland is an organ typical of birds, over which no agreement regarding its function has been attained yet. Authors attribute to the gland an hydrophobic action. The function of the gland is herein explored in rock pigeon, Columba livia, was used as experimental model for trials. The study was focused on the physiological role of the gland in relation to biochemical parameters. Pigeons were separated in groups of six birds each: a) intact control, b) surgical control, c) ablationed. Comparing control specimens with gland-removed specimens, recorded serum levels after 32 days were the following (mean+/-SD): cholesterol (g/l), 3.7+/-0.6 vs. 4.1+/-0.6; total lipids (g/l), 15.7+/-2.0 vs. 13.7+/-2.7; calcium (mg/l), 100.5 +/- 24.3 vs. 99.1 +/- 9.2. None of the differences were statistically significant. Thus, no alterations of basic biochemical parameters associated with metabolism of lipids were registered. In one group of birds the calcium and cholesterol levels were determined 122 days after surgery; in this case values remained unchanged related to the beginning of the trials. Results suggest that the uropygial gland is not physiologically related to either the homeostasis of total lipids, cholesterol or the regulation of calcium metabolism.
- Published
- 2006
7. A low degree of fatty acid unsaturation leads to high resistance to lipid peroxidation in mitochondria and microsomes of different organs of quail (Coturnix coturnix japonica).
- Author
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Gutiérrez AM, Reboredo GR, Mosca SM, and Catalá A
- Subjects
- Animals, Brain metabolism, Fatty Acids, Unsaturated metabolism, Lipid Metabolism, Male, Microsomes, Liver metabolism, Mitochondria, Heart metabolism, Mitochondria, Liver metabolism, Myocardium metabolism, Organ Specificity, Rats, Coturnix metabolism, Fatty Acids metabolism, Lipid Peroxidation, Microsomes metabolism, Mitochondria metabolism
- Abstract
Birds -- particularly long-lived species -- have special adaptations for preventing tissue damage caused by reactive oxygen species. The objective of the present study was to analyse the fatty acid composition and non-enzymatic lipid peroxidation of mitochondria and microsomes obtained from liver, heart and brain of quail (Coturnix coturnix japonica), a short-lived bird. Fatty acids located in total lipids of rat liver, heart and brain mitochondria and microsomes were determined using gas chromatography and lipid peroxidation was evaluated using a chemiluminescence assay. The unsaturated fatty acid content found in mitochondria and microsomes of all tissue examined was approximately 50 and 40%, respectively with a prevalence of C18:1 n9. The C18:2 n6 content in brain mitochondria was significantly lower as compared to liver and heart mitochondria. Whereas the C20:4 n6 content in mitochondria from all tissues examined and brain microsomes was approximately 6%, liver and heart microsomes exhibited lower values. C22:6 n3 was absent in liver mitochondria, very low content in liver microsomes and heart organelles (between 0.5 and 1%) and high content in brain organelles, with mitochondria having the highest value (11%). Whereas liver and heart organelles were not affected when subjected to lipid peroxidation, brain mitochondria were highly affected, as indicated by the increase in chemiluminescence and a considerable decrease of C20:4 n6 and C22:6 n3. These results indicate that a low degree of fatty acid unsaturation in liver and heart organelles of quail, a short-lived bird, may confer advantage by decreasing their sensitivity to lipid peroxidation process.
- Published
- 2006
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8. A new Oxyurida (Thelastomatidae) from Cyclocephala signaticollis Burmeister (Coleoptera: Scarabaeidae) from Argentina.
- Author
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Camino NB and Reboredo GR
- Subjects
- Animals, Argentina, Female, Male, Oxyurida anatomy & histology, Oxyurida classification, Coleoptera parasitology, Oxyurida isolation & purification
- Abstract
Cephalobellus cyclocephalae n. sp. (Oxyurida: Thelastomatidae), a parasite of larvae of Cyclocephala signaticollis (Coleoptera, Scarabaeidae), found in Argentina is described and illustrated. It is characterized by the cuticle striated at the anterior end in both sexes, with 15 annules, buccal cavity short and not armed, and the male with 4 pairs of genital papillae, 1 pair of preanal papillae, 3 pairs of postanal papillae.
- Published
- 2005
- Full Text
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9. Fatty acid composition and lipid peroxidation induced by ascorbate-Fe2+ in different organs of goose (Anser anser).
- Author
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Gutiérrez AM, Reboredo GR, Mosca SM, and Catalá A
- Subjects
- Animals, Brain drug effects, Brain metabolism, Fatty Acids analysis, Female, Liver chemistry, Liver drug effects, Liver metabolism, Microsomes, Liver drug effects, Microsomes, Liver metabolism, Mitochondria, Heart drug effects, Mitochondria, Heart metabolism, Mitochondria, Liver drug effects, Mitochondria, Liver metabolism, Myocardium chemistry, Vitamin E analysis, Vitamin E metabolism, Ascorbic Acid pharmacology, Fatty Acids metabolism, Geese, Lipid Peroxidation physiology
- Abstract
Many reports have demonstrated that birds show a low degree of fatty acid unsaturation and lipid peroxidation compared with mammals of similar body size. The aim of the present study was to examine fatty acid profiles, non-enzymatic lipid peroxidation and vitamin E levels of mitochondria and microsomes obtained from liver, heart and brain of goose (Anser anser). The unsaturated fatty acid content found in mitochondria and microsomes of all tissues examined was approximately 60% with a prevalence of C18:1 n9 + C18:2 n6 = 50%. The 20:4 n6 + C22:6 n3 content was significantly higher in brain organelles (approx. 16%) compared with mitochondria and microsomes of liver and heart (approx. 4%). Whereas these organelles were not affected when subjected to lipid peroxidation, brain mitochondria were highly affected, as indicated by the increase in chemiluminescence and a considerable decrease of arachidonic and docosahexaenoic acids. These changes were not observed during lipid peroxidation of brain microsomes. Vitamin E content was higher in liver and heart than in brain mitochondria (1.77 +/- 0.06 and 1.93 +/- 0.13 vs. 0.91 +/- 0.09 nmol/mg protein). The main conclusion of this paper is that a lower degree of unsaturation of fatty acids in liver and heart mitochondria and a higher vitamin E level than in brain mitochondria protect those tissues against lipid peroxidation.
- Published
- 2004
- Full Text
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10. Fatty acid profiles and lipid peroxidation of microsomes and mitochondria from liver, heart and brain of Cairina moschata.
- Author
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Gutiérrez AM, Reboredo GR, and Catalá A
- Subjects
- Animals, Arachidonic Acid metabolism, Ascorbic Acid chemistry, Docosahexaenoic Acids metabolism, Female, Iron chemistry, Luminescent Measurements, Microsomes, Liver metabolism, Mitochondria, Heart metabolism, Mitochondria, Liver metabolism, Brain metabolism, Ducks metabolism, Fatty Acids analysis, Lipid Peroxidation physiology, Liver metabolism, Microsomes metabolism, Mitochondria metabolism, Myocardium metabolism
- Abstract
Studies were done to analyze the fatty acid composition and sensitivity to lipid peroxidation (LP) of mitochondria and microsomes from duck liver, heart and brain. The fatty acid composition of mitochondria and microsomes was tissue-dependent. In particular, arachidonic acid comprised 17.39+/-2.32, 11.75+/-3.25 and 9.70+/-0.40% of the total fatty acids in heart, liver and brain mitochondria respectively but only 13.39+/-1.31, 8.22+/-2.43 and 6.44+/-0.22% of the total fatty acids in heart, liver and brain microsomes, respectively. Docosahexahenoic acid comprised 17.02+/-0.78, 4.47+/-1.02 and 0.89+/-0.07% of the total fatty acids in brain, liver and heart mitochondria respectively but only 7.76+/-0.53, 3.27+/-0.73 and 1.97+/-0.38% of the total fatty acids in brain, liver and heart microsomes. Incubation of organelles with ascorbate-Fe(2+) at 37 degrees C caused a stimulation of LP as indicated by the increase in light emission: chemiluminescence (CL) and the decrease of arachidonic acid to: 5.17+/-1.34, 8.86+/-0.71 and 5.86+/-0.68% of the total fatty acids in heart, liver and brain mitochondria, respectively, and to 4.10+/-0.61 in liver microsomes. After LP docosahexahenoic acid decrease to 7.29+/-1.47, 1.36+/-0.18 and 0.30+/-0.11% of the total fatty acids in brain, liver and heart mitochondria. Statistically significant differences in the percent of both peroxidable fatty acids (arachidonic and docosahexaenoic acid) were not observed in heart and brain microsomes and this was coincident with absence of stimulation of LP. The results indicate a close relationship between tissue sensitivity to LP in vitro and long chain polyunsaturated fatty acid concentration. Nevertheless, any oxidative stress in vitro caused by ascorbate-Fe(2+) at 37 degrees C seems to avoid degradation of arachidonic and docosahexaenoic acids in duck liver and brain microsomes. It is possible that because of the important physiological functions of arachidonic and docosahexaenoic acids in these tissues, they are protected to maintain membrane content during oxidative stress.
- Published
- 2002
- Full Text
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11. [A new species of the genus Cameronia Basir (Oxyurida: Thelastomatidae) parasite of Gryllodes laptatae Sauss (Orthoptera: Gryllidae) in Argentina].
- Author
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Reboredo GR and Camino NB
- Subjects
- Animals, Argentina, Female, Male, Oxyurida classification, Gryllidae parasitology, Oxyurida anatomy & histology
- Abstract
Cameronia laplatae n. sp. found in City Bell, Argentina, parasitizing crickets is described and illustrated. The new species is distinguished from other members of the genus Cameronia by the distribution pattern of the genital papillae in the male. It differs from all congeners mainly in having two pairs preanal y two pairs postanal papillae.
- Published
- 2001
12. Two new rhabditida species (Nematoda: Rhabditidae) parasites of Cyclocephala signaticollis (Coleoptera: Scarabaeidae) in Argentina.
- Author
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Reboredo GR and Camino NB
- Subjects
- Animals, Argentina, Female, Larva parasitology, Male, Rhabditoidea anatomy & histology, Rhabditoidea isolation & purification, Coleoptera parasitology, Rhabditoidea classification
- Abstract
Two different Rhabditida species (Nematoda: Rhabditidae) Parasitorhabditis platidontus n. sp. and Cruznema campestris n. sp. are described and illustrated from the larvae of Cyclocephala signaticollis (Coleoptera: Scarabaeidae) from Buenos Aires province, Argentina. Parasitorhabditis platidontus n. sp. is characterized by having 4 odontoplates in the stoma and the vulva is at 80% of the length of the body. Cruznema campestris n. sp. can be distinguished by the presence of 4 odontoplates and the arrangement of the male genital papillae, 9 pairs, of which 4 are preanal and 5 postanal.
- Published
- 2000
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13. Non-enzymatic lipid peroxidation of microsomes and mitochondria isolated from liver and heart of pigeon and rat.
- Author
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Gutiérrez AM, Reboredo GR, Arcemis CJ, and Catalá A
- Subjects
- Animals, Arachidonic Acid metabolism, Ascorbic Acid chemistry, Columbidae, Fatty Acids chemistry, Iron chemistry, Luminescent Measurements, Rats, Rats, Wistar, Lipid Peroxidation, Liver metabolism, Microsomes metabolism, Mitochondria metabolism, Myocardium metabolism
- Abstract
Studies were carried out to determine the level of ascorbate-Fe2+ dependent lipid peroxidation of mitochondria and microsomes isolated from liver and heart of rat and pigeon. Measurements of chemiluminescence indicate that the lipid peroxidation process was more effective in mitochondria and microsomes from rat liver than in the same organelles obtained from pigeon. In both mitochondria and microsomes from liver of both species a significant decrease of arachidonic acid was observed during peroxidation. The rate C18:2 n6/C20:4 n6 was 4.5 times higher in pigeon than in rat liver. This observation can explain the differences noted when light emission and unsaturation index of both species were analysed. A significant decrease of C18:2 n6 and C20:4 n6 in pigeon liver mitochondria was observed when compared with native organelles whereas in pigeon liver microsomes only C20:4 n6 diminished. In rat liver mitochondria only arachidonic acid C20:4 n6 showed a significant decrease whereas in rat liver microsomes C20:4 n6 and C22:6 n3 decreased significantly. However changes were not observed in the fatty acid profile of mitochondria and microsomes isolated from pigeon heart. In the heart under our peroxidation conditions the fatty acid profile does not appear to be responsible for the different susceptibility to the lipid peroxidation process. The lack of a relationship between fatty acid unsaturation and sensitivity to peroxidation observed in heart suggest that other factor/s may be involved in the protection to lipid peroxidation in microsomes and mitochondria isolated from heart.
- Published
- 2000
- Full Text
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14. Cephalobellus lobulata n. sp. (Oxyurida:Thelastomatidae) A parasite of Neocurtilla claraziana Saussure (Orthoptera: gryllotalpidae) from Argentina.
- Author
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Camino NB and Reboredo GR
- Subjects
- Animals, Argentina, Female, Male, Gryllidae parasitology, Oxyurida anatomy & histology
- Abstract
Cephalobellus lobulata n. sp. (Oxyurida: Thelastomatidae) a parasite of the mole cricket Neocurtilla claraziana Saussure (Orthoptera: Gryllotalpidae) found in Argentina is described and illustrated. It is characterized by a short buccal cavity armed with three teeth, a striated cuticle with the first annule wide with four lobes and the second annule divided in twelve lobes. The male have three pairs of preanal papillae and two pairs of postanal papillae.
- Published
- 2000
- Full Text
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15. Binema bonaerensis n. sp. (Oxyurida: Thelastomatidae) parasite of Neocurtilla claraziana Saussure (Orthoptera: Gryllotalpidae) in Argentina.
- Author
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Camino NB and Reboredo GR
- Subjects
- Animals, Argentina, Female, Male, Orthoptera parasitology, Oxyurida anatomy & histology, Oxyurida isolation & purification
- Abstract
The nematode Binema bonaerensis n. sp. (Oxyurida: Thelastomatidae) is described from the intestine of the mole cricket of Neocurtilla claraziana Saussure (Orthoptera: Gryllotalpidae) from Buenos Aires Province, Argentina. It is distinguished mainly by having a conical tail; three sclerotized arches in the buccal cavity; an excretory pore immediately posterior to the base of the esophagus and the presence of five pairs of male genital papillae with one pair preanal and four pairs postanal.
- Published
- 1999
- Full Text
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16. Euryconema brevicauda n. sp. (Oxyurida: Thelastomatidae) a parasite of the mole cricket Neocurtilla claraziana (Orthoptera: Gryllotalpidae) in Argentina.
- Author
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Camino NB and Reboredo GR
- Subjects
- Animals, Argentina, Female, Male, Nymph parasitology, Oxyurida anatomy & histology, Pest Control, Biological, Gryllidae parasitology, Oxyurida classification
- Abstract
Euryconema brevicauda n. sp. parasitizing the mole cricket Neocurtilla claraziana found in Buenos Aires province, Argentina, is described and illustrated. This species is characterized by the male having 3 pairs of genital papillae, 1 pair preanal and 2 pairs postanal, and a short, conical-shaped tail.
- Published
- 1999
17. Two new species of nematodes (Rhabditida: Diplogasteridae and Rhabditidae) parasites of Gryllodes laplatae (Orthoptera: Gryllidae) in Argentina.
- Author
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Reboredo GR and Camino NB
- Subjects
- Animals, Argentina, Female, Male, Mantodea anatomy & histology, Gryllidae parasitology, Rhabditida classification, Rhabditida physiology
- Abstract
Cephalobium magdalensis n. sp. (Rhabditida: Diplogasteridae) found in Magdalena, Buenos Aires, and Cruznema lincolnensis n. sp. (Rhabditida: Rhabditidae) found in Lincoln, Buenos Aires, parasitizing the cricket Gryllodes laplatae (Orthoptera: Gryllidae) are described and illustrated. C. magdalensis n. sp. is characterized by having the excretory pore between the pseudobulb and the basal bulb and seven pairs of postanal papillae in the male. C. lincolnensis n. sp. can be distiguished by having meanly two pairs of preanal papillae, one pair of adanal papillae and six pairs of postanal papillae in the male.
- Published
- 1998
- Full Text
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