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396 results for “Astyanax”
Fig. 5 in A new species of Astyanax (Characiformes: Characidae) from the rio de Contas basin, Bahia, Brazil
Fig. 5. Collecting sites of Astyanax varii: (a) type locality, Brazil, Bahia State, Ubaitaba, Fazenda Progresso, rio Coricó, lower rio de Contas basin; (b) Brazil, Bahia State, Jussiape, Caraguataí, rio Água Suja at Balneário Rio da Barra, upper rio de Contas basin.
Fig. 1 in A new species of Astyanax (Characiformes: Characidae) from the rio de Contas basin, Bahia, Brazil
Fig. 1. Astyanax varii, Brazil, Bahia State: (a) MZUSP 121062, holotype, 41.4 mm SL, Ubaitaba, lower rio de Contas basin, rio Coricó; (b) live paratype, not catalogued.
Fig. 3 in A new species of Astyanax (Characiformes: Characidae) from the rio de Contas basin, Bahia, Brazil
Fig. 3. Upper and lower jaws of Astyanax varii, UFBA 8405, paratype, 35.1 mm SL, lateral view, left side.
Fig. 4 in Food resource partitioning among species of Astyanax (Characiformes: Characidae) in the Lower Iguaçu River and tributaries, Brazil
Fig. 4. Relative frequency (%) of the diet overlap index of Astyanax species pairs in the Low Iguaçu River and tributaries in Brazil. Ab=A. bifasciatus; Ad=A. dissimilis; Ag=A. gymnodontus; Al=A. lacustris; Am=A. minor. Low <0.39; intermediate =0.40-0.59; high> 0.60.
Fig.1 in Food resource partitioning among species of Astyanax (Characiformes: Characidae) in the Lower Iguaçu River and tributaries, Brazil
Fig.1. Study area showing the sampling sites (numbers 1 to 25) in the Lower Iguaçu River and tributaries in Brazil.
Fig. 2 in Comparative cytogenetics of Astyanax (Teleostei: Characidae) from the upper Paraguay basin
Fig. 2. Karyotypes of Astyanax abramis (A and B), A. lacustris (C and D) and A. pirapuan (E and F) after Giemsa-stained and showing the distribution of constitutive heterochromatin revealed by C-banding. Insets show Ag-NOR and 18S-bearing chromosomes pairs. Scale bar = 10 µm.
Fig. 3 in Histopathological alterations in Astyanax bifasciatus (Teleostei: Characidae) correlated with land uses of surroundings of streams
Fig. 3. Photomicrograph of liver of Astyanax bifasciatus in streams of the basin of the lower Iguaçu River. a. Normal liver, central vein (CV), and sinusoids capillary (S) in forest stream (F1). b. Tubular arrangement of hepatocytes (H), nucleus (arrow), nucleolus (head of arrow), and centrilobular vein (*) in forest stream (F1); c. Pancreatic tissue (*), presence of eosinophils around the hepatopancreas tissue (arrow) in forest stream (F2). d. Presence of picnotic nucleus (head of arrow) and nuclear hypertrophy (arrow) in rural stream (R2). e. Cytoplasmic degeneration (*), the picnotic nucleus (arrow), the nucleus in a lateral position (head of arrow) in urban stream (U2). f. Picnotic nucleus (head of arrow) and cytoplasmic vacuolization (*) in rural stream (R2). g. Leukocyte infiltration (arrow) in urban stream (U1). h. Melanomacrophage aggregates (arrows) around the central vein (CV) in urban stream (U2). Stained Hematoxylin Harris and eosin.
Fig. 3 in Comparative cytogenetics of Astyanax (Teleostei: Characidae) from the upper Paraguay basin
Fig. 3. Metaphase of Astyanax pirapuan after fluorescent in situ hybridization with 18S probe. Arrows indicate the marked chromosomes. Scale bar = 10 µm.
Fig. 2 in Histopathological alterations in Astyanax bifasciatus (Teleostei: Characidae) correlated with land uses of surroundings of streams
Fig. 2. Photomicrograph of gills of Astyanax bifasciatus from streams of the basin of the lower Iguaçu River. a. Normal aspect of gill in forest stream (F1), F - filament, L - lamellae. b. Lamellar oedema (arrows) in forest stream (F2). c. Lamellar aneurysm (*) in urban stream (U1). d. Lamellar hyperplasia (arrows) in rural stream (R2). e. Lamellar hyperplasia (arrows) in highest magnification in rural stream (R2). f. Partial fusion of lamellae (*) in rural stream (R1). g. Epithelium rupture and hemorrhage (arrow) in urban stream (U2). h. Mitochondria-rich cells hyperplasia (arrow) and mucous cells hyperplasia (head of arrow) in urban stream (U2). a-g. Stained Hematoxylin Harris and eosin. h. Stained toluidine blue.
Fig. 1 in Ontogenetic development of tetra Astyanax lacustris (Characiformes: Characidae)
Fig. 1. Development of Astyanax lacustris during the yolk-sac larval stage: a. newly hatched larva, with adhesive gland (A), eyes with little pigmentation (B), the optic vesicle (C), and no anal opening (D); b. increased pigmentation of the eye (E), increased pigmentation of the yolk reserves (F), and button of the pectoral fin (G); c. mouth in ventral position (H), further development of the optic vesicle (I), and pigmentation of the heart (J); d. pigmented eyes (K) and swim bladder (L).
Fig. 4 in Ontogenetic development of tetra Astyanax lacustris (Characiformes: Characidae)
Fig. 4. Specimens of Astyanax lacustris in the postflexion stage: a. presence of food in the digestive tract (A); b. teeth (B); c. punctate pigmentation on the dorsal region of the head (C); and d. scales (D).
Fig. 6 in Ontogenetic development of tetra Astyanax lacustris (Characiformes: Characidae)
Fig. 6. Total length (mm) of Astyanax lacustris during its larval development. Arrows indicate the total consumption time of yolk reserves.
FIGURE 7 in New small-sized species of Astyanax (Characiformes: Characidae) from the upper rio Paraguai basin, Brazil, with discussion on its generic allocation
FIGURE 7 | Different types of dark midlateral stripes in Astyanax: A. Stripe of variously shapes and pigmentation starting posterior to the humeral blotch and never connected to it (e.g., A. bagual and A. eremus); B. Stripe starting immediately posterior to the humeral blotch and usually ending at the tip of middle caudal-fin rays (e.g., species typically assigned to the Astyanax bimaculatus-group); C. Narrower stripe starting at posterior margin of the opercle, becoming blurred posteriorly and not reaching the caudal fin (e.g., Jupiaba anterior and J. ajuricaba); D. Stripe starting immediately posterior to the opercle (e.g., A. joaovitori and A. scintillans). See discussion for further details. Fish layout modified from Van der Sleen, Albert (2018).
FIGURE 6 in New small-sized species of Astyanax (Characiformes: Characidae) from the upper rio Paraguai basin, Brazil, with discussion on its generic allocation
FIGURE 6 | Type locality of Astyanax nobre, rio Salobra at Lago Azul, tributary of rio Cuiabá, rio Paraguai basin, 14º35'43.2"S 55º58'09.6"W, Nobres, Mato Grosso State, Brazil. Photo by M. A. Junghans.
FIGURE 3 in New small-sized species of Astyanax (Characiformes: Characidae) from the upper rio Paraguai basin, Brazil, with discussion on its generic allocation
FIGURE 3 | Live coloration of Astyanax nobre, paratypes, MZUSP 118302: A. Male; B. Female. Specimens not measured. Photo by W. Ohara.
FIGURE 5 in New small-sized species of Astyanax (Characiformes: Characidae) from the upper rio Paraguai basin, Brazil, with discussion on its generic allocation
FIGURE 5 | Distribution map of Astyanax nobre in the rio Salobra, upper rio Paraguai basin, Brazil. Brown star (type locality).
FIGURE 2 in New small-sized species of Astyanax (Characiformes: Characidae) from the upper rio Paraguai basin, Brazil, with discussion on its generic allocation
FIGURE 2 | Lateral view of right side, premaxillary, maxillary, and dentary of Astyanax nobre, MZUSP 118302, paratype. Scale bar = 0.5 mm.
FIGURE 1 in New small-sized species of Astyanax (Characiformes: Characidae) from the upper rio Paraguai basin, Brazil, with discussion on its generic allocation
FIGURE 1 | Holotype of Astyanax nobre, MZUSP 125905, 25.6 mm SL, Brazil, Mato Grosso State, Municipality of Nobres, rio Paraguai basin, upper rio Salobra drainage.
FIGURE 4 in New small-sized species of Astyanax (Characiformes: Characidae) from the upper rio Paraguai basin, Brazil, with discussion on its generic allocation
FIGURE 4 | Underwater photographs of wild specimens of Astyanax nobre at its type locality Recanto Ecológico Lagoa Azul, Bom Jardim district, Municipality of Nobres, Mato Grosso State, rio Salobra drainage, rio Paraguai basin: A. Pair of males; B. Pair of females. Details about differences between sexes can be found in Sexual dimorphism section. Photo by M. Melo.
Fig. 3 in Astyanax guaricana (Ostariophysi: Characidae), a new species from the rio Cubatão drainage, Paraná State, Southern Brazil
Fig. 3. Map of Paraná State and adjacent areas showing the distribution of Astyanax guaricana. The star represents the type locality (rio Arraial, at Reservoir of Guaricana dam, affluent of the rio Cubatão) and the circle represents the locality of the paratypes.
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