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75 results for “Gymnotus”
FIGURE 5 in Gymnotus refugio, a new and endangered species of electric fish of the Gymnotus pantherinus species-group from southern Brazil (Gymnotiformes: Gymnotidae)
FIGURE 5. Syntype of Gymnotus pantherinus (NMW 76443, 246.45 mm TL) from the region of Santos, São Paulo State, Brazil.
FIGURE 4 in Gymnotus refugio, a new and endangered species of electric fish of the Gymnotus pantherinus species-group from southern Brazil (Gymnotiformes: Gymnotidae)
FIGURE 4. Typical habitat of Gymnotus refugio. Carmelitas creek covered by dense aquatic vegetation near its mouth in laguna dos Patos, Laranjal beach, Pelotas, Rio Grande do Sul State, Brazil.
FIGURE 2 in Gymnotus refugio, a new and endangered species of electric fish of the Gymnotus pantherinus species-group from southern Brazil (Gymnotiformes: Gymnotidae)
FIGURE 2. Color pattern variation in Gymnotus refugio, paratypes, UFRGS 16371 (above, 176.29 mm TL, below, 151.19 mm TL), Refúgio da Vida Silvestre Banhado dos Pachecos, Viamão, Rio Grande do Sul State, Brazil. Photos taken just after fixation in formalin.
FIGURE 1 in Gymnotus refugio, a new and endangered species of electric fish of the Gymnotus pantherinus species-group from southern Brazil (Gymnotiformes: Gymnotidae)
FIGURE 1. Gymnotus refugio, holotype (UFRGS 8752, 171.53 mm TL), laguna dos Patos drainage, Amaral Ferrador, Rio Grande do Sul State, Brazil.
FIGURE 3 in Gymnotus refugio, a new and endangered species of electric fish of the Gymnotus pantherinus species-group from southern Brazil (Gymnotiformes: Gymnotidae)
FIGURE 3. Distribution of Gymnotus refugio in southern Brazil. Circles represent paratype localities; empty circle represents the type locality.
FIGURE 3. A in Differences in karyotype between two sympatric species of Gymnotus (Gymnotiformes: Gymnotidae) from the eastern amazon of Brazil
FIGURE 3. A. Giemsa stained karyotype of Gymnotus mamiraua with the NOR pair (1); B. Cbanded karyotype; C. DAPI stained karyotype; D. CMA3 stained metaphase (the arrows indicate the NOR pair).
FIGURE 2. A in Differences in karyotype between two sympatric species of Gymnotus (Gymnotiformes: Gymnotidae) from the eastern amazon of Brazil
FIGURE 2. A. Giemsa stained karyotype of Gymnotus cf. carapo with the NOR pair (20); B. Sequenced CBanding; C. DAPI stained karyotype; D. CMA3 stained metaphase (the arrows indicate the NOR pair).
FIGURE 1. A in Differences in karyotype between two sympatric species of Gymnotus (Gymnotiformes: Gymnotidae) from the eastern amazon of Brazil
FIGURE 1. A. Gymnotus cf. carapo (MCP 40926) B. Gymnotus mamiraua (MCP 40927) from Marajó Island, state of Pará, Brazil, scale bar = 1 cm.
FIGURE 19 in Revision of the polytypic electric fish Gymnotus carapo (Gymnotiformes, Teleostei), with descriptions of seven subspecies
FIGURE 19. Relative warp grids for the first and second principal components of the variance within a size series of G. c. carapo and between subspecies of G. carapo. A–B. First and second principal components of the variance within the G. c. carapo size series (n=42, 38–316 mm). C–D. First and second principal components of the variance between the seven subspecies of G. carapo (n=88).
FIGURE 18 in Revision of the polytypic electric fish Gymnotus carapo (Gymnotiformes, Teleostei), with descriptions of seven subspecies
FIGURE 18. Comparisons of morphometric and thalweg-constrained geographic distances among subspecies pairs of G. carapo. Similar subspecies pairs highlighted in shades of green; differences in shades of orange. A. Number of characters with no significant differences using caliper-based morphometrics against thalweg-constrained distances via the Shield pathways. B. Procrustes distances from geometric morphometrics against thalweg-constrained distances via the Sub-Andean pathways.
FIGURE 16 in Revision of the polytypic electric fish Gymnotus carapo (Gymnotiformes, Teleostei), with descriptions of seven subspecies
FIGURE 16. Principal components analysis of 15 geometric morphometric landmarks for three sympatric Gymnotus from the eastern Amazon: G. c. orientalis (n=9), G. bahianus (n=3) and G. diamantinensis (n=2). Note the greater separation in geometric morphometric PC space than is observed among G. carapo subspecies.
FIGURE 15 in Revision of the polytypic electric fish Gymnotus carapo (Gymnotiformes, Teleostei), with descriptions of seven subspecies
FIGURE 15. Principal components analysis of 15 geometric morphometric landmarks for three sympatric Gymnotus from the western Amazon: G. c. occidentalis (n=18), G. arapaima (n=29), G. ucamara (n=5). Note the greater separation in geometric morphometric PC space than is observed among G. carapo subspecies.
FIGURE 13 in Revision of the polytypic electric fish Gymnotus carapo (Gymnotiformes, Teleostei), with descriptions of seven subspecies
FIGURE 13. Principal components analysis of 15 geometric morphometric landmarks for 73 specimens from seven subspecies of G. carapo: G. c. australis (AU, n=4), G. c. caatingaensis (CT, n=3), G. c. carapo (CA, n=15), G. c. madeirensis (MD, n=13), G. c. occidentalis (OC, n=18), G. c. orientalis (OR, n=9), and G. c. septentrionalis (SE, n=10). Note the substantial overlap in PC space between regionally-delineated subspecies.
FIGURE 12 in Revision of the polytypic electric fish Gymnotus carapo (Gymnotiformes, Teleostei), with descriptions of seven subspecies
FIGURE 12. Principal components analysis of four meristic characters for three sympatric Gymnotus from the eastern Amazon: G. c. orientalis (n=12), G. bahianus (n=8) and G. diamantinensis (n=4). The number of band pairs (BND), posterior lateral line rami (PLR) and number of pectoral fin rays (P1R) load heavily on PC1, while number of scales above the lateral line at midbody (SAL) loads heavily on PC2. Note the greater separation in PC space than is observed among G. carapo subspecies.
FIGURE 11 in Revision of the polytypic electric fish Gymnotus carapo (Gymnotiformes, Teleostei), with descriptions of seven subspecies
FIGURE 11. Principal components analysis of four meristic characters for three sympatric Gymnotus species from the western Amazon: G. c. occidentalis (n=14), G. arapaima (n=18), G. ucamara (n=1). The number of band pairs (BND) and number of pectoral fin rays (P1R) load heavily on PC1, while number of scales above the lateral line at midbody (SAL) loads heavily on PC2. Note the greater separation in PC space than is observed among G. carapo subspecies.
FIGURE 9 in Revision of the polytypic electric fish Gymnotus carapo (Gymnotiformes, Teleostei), with descriptions of seven subspecies
FIGURE 9. Principal components analysis of four meristic characters for 58 specimens from seven subspecies of G. carapo: G. c. carapo (CA, n=10), G. c. septentrionalis (SE, n=6), G. c. madeirensis (MD, n=8), G. c. occidentalis (OC, n=14), G. c. orientalis (OR, n=12), G. c. caatingaensis (CT, n=6) and G. c. australis (AU, n=2). Note that the number of posterior lateral line rami (PLR) loads heavily PC1 while the number of scales above the lateral line (SAL). Note the substantial overlap in PC space between most subspecies.
FIGURE 14 in Revision of the polytypic electric fish Gymnotus carapo (Gymnotiformes, Teleostei), with descriptions of seven subspecies
FIGURE 14. Principal components analysis of 15 geometric morphometric landmarks for five sympatric Gymnotus species of the southern fauna: G. c. australis (n=4), G. chimarrao (n=1), G. omarorum (n=10), G. sylvius (n=7) and Gymnotus CALA (n=29). Note the greater separation in geometric morphometric PC space than is observed among G. carapo subspecies.
FIGURE 7 in Revision of the polytypic electric fish Gymnotus carapo (Gymnotiformes, Teleostei), with descriptions of seven subspecies
FIGURE 7. Principal components analysis of eight point-to-point linear measurements for three sympatric Gymnotus from the western Amazon: G. c. occidentalis (n=65), G. arapaima (n=34), G. ucamara (n=4). Head length (HL), and interorbital distance (IO) load heavily on PC1, while postorbital distance (PO), body width (BW) and preorbital distance (PO) load heavily on PC2. Note the greater separation in PC space than is observed among G. carapo subspecies.
FIGURE 6 in Revision of the polytypic electric fish Gymnotus carapo (Gymnotiformes, Teleostei), with descriptions of seven subspecies
FIGURE 6. Principal components analysis of point-to-point linear measurements for five sympatric Gymnotus species from the southern humid Neotropics: G. c. australis (n=25), G. chimarrao (n=4), G. omarorum (n=18), G. sylvius (n=5) and Gymnotus CALA (n=68). Head length (HL) and head depth (HD) load heavily on PC1, while preorbital distance (PR) and postorbital distance (PO) load heavily on PC2. Note the greater separation in PC space than is observed among G. carapo subspecies.
FIGURE 5 in Revision of the polytypic electric fish Gymnotus carapo (Gymnotiformes, Teleostei), with descriptions of seven subspecies
FIGURE 5. Principal components analysis of linear measurements for 175 specimens from seven subspecies of G. carapo: G. c. australis (AU, n=25), G. c. caatingaensis (CT, n=8), G. c. carapo (CA, n=31), G. c. madeirensis (MD, n=13), G. c. occidentalis (OC, n=65), G. c. orientalis (OR, n=16) and G. c. septentrionalis (SE, n=15). Head length, head depth, body width and body depth load heavily on PC1, while pre- and postorbital (PR and PO, respectively) and preanal (PA) lengths load heavily on PC2. Note the substantial overlap in PC space between subspecies.
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