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54 results for “Gymnotidae”
FIGURE 1 in Revision of Gymnotus (Gymnotiformes: Gymnotidae) from the Upper Madeira Basin of Bolivia and Peru, with descriptions of two new species
FIGURE 1. Collection localities of Gymnotus from the Upper Madeira basin. Black star indicates the type locality of G. eyra n. sp., while the white star indicates the type locality of G. riberalta n. sp.
FIGURE 6 in Revision of Gymnotus (Gymnotiformes: Gymnotidae) from the Upper Madeira Basin of Bolivia and Peru, with descriptions of two new species
FIGURE 6. All five valid Gymnotus species from the Upper Madeira Basin, Bolivia and Peru. Scale bars = 10 mm TL. A. Gymnotus carapo madeirensis holotype, UMSS 06964, 178 mm TL. B. Gymnotus chaviro holotype, MUSM 33715, 233 mm TL. C. Gymnotus coropinae, MUSM 20264, 118 mm TL. D. Gymnotus eyra n. sp., INHS 37119, 178 mm TL. E. Gymnotus riberalta n. sp. holotype, CBF 10248, 199 mm TL.
FIGURE 3 in Revision of Gymnotus (Gymnotiformes: Gymnotidae) from the Upper Madeira Basin of Bolivia and Peru, with descriptions of two new species
FIGURE 3. Principal components analysis (PCA) of 10 morphometric and eight meristic characters comparing G. pantanal (red) to G. riberalta (blue). Ellipses represent 95% confidence intervals. A. In the morphometric analysis comparing G. pantanal (n=18), and G. riberalta (n=10), principal component one is influenced strongly negatively by head depth (HD), head width (HW), and mouth width (MW), while principal component two is influenced strongly positively by postorbital distance (PO) and is influenced strongly negatively by head length (HL). B. In the meristic analysis comparing G. pantanal (n=15), and G. riberalta (n=8), principal component one is influenced strongly positively by the number of anal-fin pterygiophore scales (APS) and the number of pored lateral-line scales and is influenced strongly negatively by the number of pectoral fin rays, while principal component two is influenced strongly positively by the number of scales above the lateral line (SAL) and the number of band pairs (BND).
FIGURE 2 in Revision of Gymnotus (Gymnotiformes: Gymnotidae) from the Upper Madeira Basin of Bolivia and Peru, with descriptions of two new species
FIGURE 2. Principal components analysis (PCA) of 10 morphometric and eight meristic characters comparing G. mamiraua (blue) to G. eyra (red). Ellipses represent 95% confidence intervals. A. In the morphometric analysis comparing G. mamiraua (n=9), and G. eyra (n=17), principal component one is influenced strongly positively by body width (BW), head width (HW), body depth (BD), preorbital distance (PR) and postorbital distance (PO), while principal component two is influenced strongly negatively by head length (HL) and positively by head depth (HD). B. In the meristic analysis comparing G. mamiraua (n=9), and G. eyra (n=15), principal component one is influenced strongly negatively by the number of pored lateral-line scales before the first ventral ramus (PLR), the number of band pairs (BND) and the number of scales above the lateral line (SAL), while principal component two is influenced strongly negatively by the number of pectoral-fin rays (P1R) and influenced strongly positively by the number of anal-fin pterygiophore scales (APS).
FIGURE 5 in Revision of Gymnotus (Gymnotiformes: Gymnotidae) from the Upper Madeira Basin of Bolivia and Peru, with descriptions of two new species
FIGURE 5. Principal components analysis of 15 geometric morphometric landmarks comparing G. pantanal (n=5) and G. riberalta (n=9). Ellipses represent 95% confidence intervals.
FIGURE 4 in Revision of Gymnotus (Gymnotiformes: Gymnotidae) from the Upper Madeira Basin of Bolivia and Peru, with descriptions of two new species
FIGURE 4. Principal components analysis of 15 geometric morphometric landmarks comparing G. mamiraua (n=28) and G. eyra (n=17). Ellipses represent 95% confidence intervals.
Fig. 3 in Kidney anatomy, histology and histometric traits associated to renosomatic index in Gymnotus inaequilabiatus (Gymnotiformes: Gymnotidae)
Fig. 3. Histological cross-sections and histochemical reactions to hemosiderin and lipofuscin in the kidney tissue of Gymnotus inaequilabiatus. a. typical architecture of renal corpuscle with central vascularized area characterized by a clump of capillaries closed to mesangial cells (black arrow) and podocytes (white arrowhead) surrounded by Bowman's capsule; HE, bar scale = 10 µm. b. the glomerular capsule encloses the outer fibrous layer (white arrow) and filled by connective tissue. Red cells are inside capillaries; TM, bar scale = 10 µm. c–f. MMCs stained with ferrocyanide acid solution to hemosiderin and Schmorl´s solution to lipofuscin. c. melanin predominance in the head kidney MMCs. d. slight labeling to lipofuscin in the head kidney MMCs. e. positive labeling to hemosiderin (blue color) conjoined to the melanin deposits in the exocrine kidney. f. positive staining to lipofuscin (grayish blue color) in the exocrine kidney; Bar scale = 25 µm.
Fig. 1 in Kidney anatomy, histology and histometric traits associated to renosomatic index in Gymnotus inaequilabiatus (Gymnotiformes: Gymnotidae)
Fig. 1. Macroscopic and submacroscopic aspects of the kidney in Gymnotus inaequilabiatus. a. anatomical position; dorsal to the ventral vertebral column. The branches of the head portion are narrow and separated by healthy connective tissue (white color). The organ was not fixed and shows the natural color ranging from dark brown to black. Note a rounded and whitish lesion (arrow). b. dissected organ post-fixation process. The arterial vessel is positioned on the ventral side (arrows). c. submacroscopic aspect showing the MMCs diffusely distributed in both head and exocrine kidney. Bar scale = 1 cm.
Fig. 1 in Molecular assessment of Gymnotus spp. (Gymnotiformes: Gymnotidae) fishing used as live baitfish in the Tietê River, Brazil
Fig. 1. Map of the study area. Characterization of the catchment sites of Gymnotus spp. in the Jacaré-Guaçu River, southeastern Brazil. Orange dots (A1-A4) = collection sites; green dot = embarkation and disembarkation; blue rectangle = Ibitinga dam; lines on the diagonal = boundary of the State of São Paulo. 1: 100,000 (UTM projection), WGS Datum 1984. Elaborated by Luís Campanha, modified by Lilian P. Faria Pereira.
Fig. 4 in Molecular assessment of Gymnotus spp. (Gymnotiformes: Gymnotidae) fishing used as live baitfish in the Tietê River, Brazil
Fig. 4. Agarose gel electrophoresis (3.0%) of NlaIII restriction fragments obtained from COI partial PCR amplification. Gymnotus cf. sylvius (1T13, 1T24, 1T20, 1T36, 2T26, 2T29) and G. cf. cuia (2T13, 2T32 and 2T24). M- 100 bp molecular weight marker (Sinapse Inc). Numbers at fragments indicate estimated molecular weight.
FIGURE 4 in Gymnotus ardilai: a new species of Neotropical electric fish (Ostariophysi: Gymnotidae) from the Rio Magdalena Basin of Colombia
FIGURE 4. Lateral view of immature G. ardilai, 34 mm TL.
FIGURE 3 in Gymnotus ardilai: a new species of Neotropical electric fish (Ostariophysi: Gymnotidae) from the Rio Magdalena Basin of Colombia
FIGURE 3. Head profiles of Gymnotus ardilai. (A) Holotype, (B) Paratypes.
FIGURE 1. Gymnotus ardilai. Holotype IAvHP 3477 in Gymnotus ardilai: a new species of Neotropical electric fish (Ostariophysi: Gymnotidae) from the Rio Magdalena Basin of Colombia
FIGURE 1. Gymnotus ardilai. Holotype IAvHP 3477 (CAR 05), female, 430 mm TL. Lateral view.
FIGURE 1 in Feeding ecology of electric eel Electrophorus varii (Gymnotiformes: Gymnotidae) in the Curiaú River Basin, Eastern Amazon
FIGURE 1 | Study area: Curiaú River Environmental Protection Area in Macapá, Amapá, Brazil.
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