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66 results for “Xingu River”
FIGURE 2 in Cladocera from the Upper Xingu River Basin with the description of a new genus of the Chydoridae (Crustacea: Branchiopoda: Anomopoda)
FIGURE 2. Kisakiellus aweti gen. nov., sp. nov. A, Habitus from adult parthenogenetic female, lateral view. B, idem, outline of body. C, idem, dorsal view. D, idem, ventral view. E, idem, frontal view. F, idem, posterior view. G, Setae on the innermost ventral margin. H, projection of the posteroventral corner of the carapace. Scale bars = 50 µm.
FIGURE 5 in Cladocera from the Upper Xingu River Basin with the description of a new genus of the Chydoridae (Crustacea: Branchiopoda: Anomopoda)
FIGURE 5. Kisakiellus aweti gen. nov., sp. nov. A–D, third limb. A, exopodite. B, endite. C, setae and a sesillum on the distal endite. D, setae on the basal endite. E–H, fourth limb. E, exopodite. F, distal endite. G, sensillum. H, basal endite. Scale bars = 50 µm.
FIGURE 4 in Cladocera from the Upper Xingu River Basin with the description of a new genus of the Chydoridae (Crustacea: Branchiopoda: Anomopoda)
FIGURE 4. Kisakiellus aweti gen. nov., sp. nov. A, first limb. B, idem, endites. C, idem, ODL and IDL. D, idem, ODL seta. E, second limb. Scale bars = 50 µm.
FIGURE 3 in Cladocera from the Upper Xingu River Basin with the description of a new genus of the Chydoridae (Crustacea: Branchiopoda: Anomopoda)
FIGURE 3. Kisakiellus aweti gen. nov., sp. nov. A, head shield. B, head pores. C, labrum. D, first maxilla. E, antennule. F, antenna. G, idem, setae on the second segment of the exopodite. Scale bars = 50 µm.
FIGURES 34–41. Mymarothecioides germanoi n in Monogenoids (Polyonchoinea, Dactylogyridae) from Hydrolycus armatus (Characiformes, Cynodontidae) with the description of a new species of Rhinoxenus and the proposal of a new genus from the Xingu River, Pará, Brazil
FIGURES 34–41. Mymarothecioides germanoi n. sp. 34. Holotype whole-mount (ventral) (composite). 35. Copulatory complex. 36. Hook pair 1–4, 6–7. 37. Hook pair 5. 38. Ventral bar. 39. Dorsal bar. 40. Ventral anchor. 41. Dorsal anchor.
FIGURES 27–33. Mymarothecioides ararai n in Monogenoids (Polyonchoinea, Dactylogyridae) from Hydrolycus armatus (Characiformes, Cynodontidae) with the description of a new species of Rhinoxenus and the proposal of a new genus from the Xingu River, Pará, Brazil
FIGURES 27–33. Mymarothecioides ararai n. sp. 27. Holotype whole-mount (ventral) (composite). 28. Copulatory complex. 29. Hook. 30. Ventral bar. 31. Dorsal bar. 32. Ventral anchor. 33. Dorsal anchor.
FIGURES 42–45 in Monogenoids (Polyonchoinea, Dactylogyridae) from Hydrolycus armatus (Characiformes, Cynodontidae) with the description of a new species of Rhinoxenus and the proposal of a new genus from the Xingu River, Pará, Brazil
FIGURES 42–45. The copulatory complex of species of Mymarothecioides n. gen. 42. Mymarothecioides ararai n. sp. 43. Mymarothecioides xinguensis n. sp. 44. Mymarothecioides altamirensis n. sp. 45. Mymarothecioides germanoi n. sp.
FIGURES 10–17. Mymarothecioides xinguensis n in Monogenoids (Polyonchoinea, Dactylogyridae) from Hydrolycus armatus (Characiformes, Cynodontidae) with the description of a new species of Rhinoxenus and the proposal of a new genus from the Xingu River, Pará, Brazil
FIGURES 10–17. Mymarothecioides xinguensis n. sp. 10. Holotype whole-mount (ventral) (composite). 11. Copulatory complex. 12. Hook pair 1–4, 6–7. 13. Hook pair 5. 14. Ventral bar. 15. Dorsal bar. 16. Ventral anchor. 17. Dorsal anchor.
FIGURES 1–9. Rhinoxenus cachorra n in Monogenoids (Polyonchoinea, Dactylogyridae) from Hydrolycus armatus (Characiformes, Cynodontidae) with the description of a new species of Rhinoxenus and the proposal of a new genus from the Xingu River, Pará, Brazil
FIGURES 1–9. Rhinoxenus cachorra n. sp. 1. Holotype whole-mount (ventral) (composite). 2. Copulatory complex. 3. Hook pair 2. 4. Hook pair 1. 5. Hook pair 3–7. 6. Ventral bar (view, ventral). 7. Ventral bar (view, dorsal). 8. Ventral anchor. 9. Dorsal anchor.
FIGURES 18–26. Mymarothecioides altamirensis n in Monogenoids (Polyonchoinea, Dactylogyridae) from Hydrolycus armatus (Characiformes, Cynodontidae) with the description of a new species of Rhinoxenus and the proposal of a new genus from the Xingu River, Pará, Brazil
FIGURES 18–26. Mymarothecioides altamirensis n. sp. 18. Composite whole-mount (ventral). 19. Copulatory complex. 20. Hook pair 1–4. 21. Hook pair 5. 22. Hook pair 6–7. 23. Ventral bar. 24. Dorsal bar. 25. Ventral anchor. 26. Dorsal anchor.
FIGURE 1 in Rediscovery of Macrosamanea macrocalyx (Leguminosae: Mimosoideae), a threatened endemic species from the Middle Xingu River, Amazonia, Brazil
FIGURE 1. Macrosamanea macrocalyx (Ducke) Barneby & J.W.Grimes. A. Ambé creek, Altamira, PA. B. Habit. C. Leaflets. D. Flowers showing styles. E. Inflated calyx. F. Flower G. Immature fruit with persistent calyx. H. Mature fruit with persistent calyx. I. Seeds. J. Seedling. K. Cotyledons. L. Seed showing papery-membranous testa. A–L photos by W.L.S. Silva.
Fig. 4 in Population and reproductive parameters of the red-tailed catfish, Phractocephalus hemioliopterus (Pimelodidae: Siluriformes), from the Xingu River, Brazil
Fig. 4. Variation of the gonadosomatic index (GSI) of adult (reproductive) red-tailed catfish Phractocephalus hemioliopterus specimens collected from the Xingu River, in Pará, Brazil.
Fig. 1 in Population and reproductive parameters of the red-tailed catfish, Phractocephalus hemioliopterus (Pimelodidae: Siluriformes), from the Xingu River, Brazil
Fig. 1. Study area on the middle Xingu River in Pará, Brazil. The black dots represent the sampling sites, and the arrows indicate the direction of the water flow.
Fig. 2 in Population and reproductive parameters of the red-tailed catfish, Phractocephalus hemioliopterus (Pimelodidae: Siluriformes), from the Xingu River, Brazil
Fig. 2. Length-weight relationship of the red-tailed catfish Phractocephalus hemioliopterus specimens collected from the Xingu River in Pará, Brazil. a. males; and b. females.
Fig. 5 in Effects of deforestation on headwater stream fish assemblages in the Upper Xingu River Basin, Southeastern Amazonia
Fig. 5. Diagram of Canonical Correspondence Analysis (CCA) relating 29 fish species (blue letters), 11 environmental variables (black vectors), and 9 sampling sites each in first-order forest streams (solid green circles) and deforested stream reaches (open red circles) in the Upper Xingu River Basin. Species that had only one (singletons), two (doubletons), or three individuals collected were included in the analysis but are not displayed for improved visualization. Environmental variable marked with * was the strongest predictor of fish assemblage's structure. FBOM = fine benthic organic matter; CBOM = coarse benthic organic matter; Ami = Aequidens michaeli; Amu = Astyanax multidens; Api = Apistogramma sp.; Bra = Brachyglanis sp.; Cro = Crenicichla rosemariae; Etr = Eigenmannia trilineata; Gro = Gymnorhamphichthys rondoni; Gca = Gymnotus cf. carapo; Hac = Hisonotus acuen; Hel = Helogenes marmoratus; Hle = Hypopygus lepturus; Hlo = Hyphessobrycon loweae; Hma = Hoplias malabaricus; Hmu = Hyphessobrycon mutabilis; Hsp = Hyphessobrycon sp.; Hun = Hoplerythrinus unitaeniatus; Mme = Melanorivulus megaroni; Mco = Moenkhausia collettii; Mph = Moenkhausia phaeonota; Pam = Pamphorichthys sp.; Pau = Pyrrhulina australis.
Fig. 4 in Effects of deforestation on headwater stream fish assemblages in the Upper Xingu River Basin, Southeastern Amazonia
Fig. 4. NMDS diagram of the taxonomic structure of fish assemblages in forest (n=9; green solid circles and polygon) and deforested (n=9; red open circles and polygon) stream reaches in the Upper Xingu River Basin. Analysis based on the Bray– Curtis distances of 29 fish species log(x+1)-transformed catch-per-unit-effort. Vectors are species with significant loadings on NMDS axes 1 and 2, and point in the direction of increasing abundance (number of individuals). A. michaeli = Aequidens michaeli; A. multidens = Astyanax multidens; H. marmoratus = Helogenes marmoratus; M. megaroni = Melanorivulus megaroni; M. phaeonota = Moenkhausia phaeonota.
Fig. 1 in Effects of deforestation on headwater stream fish assemblages in the Upper Xingu River Basin, Southeastern Amazonia
Fig. 1. Location of study area and sampling sites. The inset shows the location of Tanguro Ranch in the southeastern region of the Amazonian Arc of Deforestation, with green representing closed canopy forests, yellow representing deforested areas and uncolored areas representing native savannas. From South to North, streams sampled are APPM, APP2A, APP2, TAN1, TAN2, and TAN3. See the text for details.
Fig. 3 in Effects of deforestation on headwater stream fish assemblages in the Upper Xingu River Basin, Southeastern Amazonia
Fig. 3. Individual-based rarefaction curves calculated for fish assemblages collected in forest (n=9) and deforested (n=9) stream reaches in the Upper Xingu River Basin. Colored areas represent 95% confidence intervals.
Fig. 2 in Effects of deforestation on headwater stream fish assemblages in the Upper Xingu River Basin, Southeastern Amazonia
Fig. 2. Catch-per-unit-effort for fishes in forest (n=9) and deforested (n=9) first-order stream reaches in the Upper Xingu River Basin. a. Abundance; b. Biomass; c. Richness. Boxes define the 25th, 50th (median) and 75th percentiles, whiskers represent the 10th and 90th percentiles. P-values calculated using univariate PerMANOVA.
FIGURE 9 in Krobia xinguensis, a new species of cichlid fish from the Xingu River drainage in Brazil (Teleostei: Cichlidae)
FIGURE 9. Collecting sites of Krobia xinguensis.
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