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31 results for “Chalceus”
Fig. 7 in Sperm evolution in the family Alestidae with comparative data for the genus Chalceus (Ostariophysi: Characiformes)
Fig. 7. Spermatozoon of Micralestes acutidens. a, a-inset: longitudinal sections. b, c, d: transverse sections from top to posterior region. The nucleus (n) is spherical and lies strongly eccentric to the flagellum (f). The centriolar complex (p, d) and nuclear fossa (arrow) is strongly eccentric. The proximal centriole (p) is lateral and perpendicular relative to the distal centriole (d). The cytoplasmic canal is present (asterisk). The midpiece (pi) is strongly asymmetrical, and contains the spherical mitochondria (m) and vesicles (v). The membrane of the midpiece (me) has a striated aspect along its length (a, a- inset). Legends: cr: concentric membranous rings, d: distal centriole, f: flagellum, m: mitochondria, me: membrane of the midpiece, n: nucleus, p: proximal centriole, v: vesicle, asterisk: cytoplasmic canal, arrow: nuclear fossa.
Fig. 1 in Sperm evolution in the family Alestidae with comparative data for the genus Chalceus (Ostariophysi: Characiformes)
Fig. 1. Spermiogenesis process of the Alestidae. Figure subunits are longitudinal sections of spermatids corresponding to (a, b) Brycinus lateralis, (c) Brycinus imberi, (d) Brachypetersius altus, (e) Alestopetersius compressus, (f) Micralestes acutidens. The flagellum is initially lateral to the nucleus. The nuclear rotation towards the flagellar axis is present. The nuclear rotation can be complete reaching 90 degrees as represented by the late spermatid of Alestopetersius compressus (e), or incomplete reaching about 20 degrees as occurs in the late spermatid of Micralestes acutidens (f). Legends: c: cytoplasm, d: distal centriole, f: flagellum, m: mitochondria, n: nucleus, p: proximal centriole, pi: midpiece, v: vesicle, asterisk: cytoplasmic canal, arrow: nuclear fossa.
Figure 21. Chalceus guaporensis and C in Taxonomic revision of the South American fish genus Chalceus Cuvier (Teleostei: Ostariophysi: Characiformes) with the description of three new species
Figure 21. Chalceus guaporensis and C. epakros spp. nov. Tukey box plots of the number of lateral line scales. Visual comparison shows that these scale counts are obviously different in the two species. Although overlapping, the counts are significantly different when subject to Mann–Whitney rank-sum tests (t = 13158.5, P <0.001; median: C. guaporensis = 36, C. epakros = 34).
Figure 20 in Taxonomic revision of the South American fish genus Chalceus Cuvier (Teleostei: Ostariophysi: Characiformes) with the description of three new species
Figure 20. Map of northern portion of South America showing geographical distribution of Chalceus epakros (dots, 1 = type locality) and C. guaporensis spp. nov. (triangles, 2 = type locality). Some symbols represent more than one locality or lot of specimens.
Figure 17 in Taxonomic revision of the South American fish genus Chalceus Cuvier (Teleostei: Ostariophysi: Characiformes) with the description of three new species
Figure 17. Chalceus spilogyros sp. nov., paratype, male, MZUSP 76069, 181.4 mm SL, Brazil, Pará, Igarapé Jacaré, right margin of Rio Tapajós, near Boim, 3∞0¢S; 55∞15¢W.
Figure 18 in Taxonomic revision of the South American fish genus Chalceus Cuvier (Teleostei: Ostariophysi: Characiformes) with the description of three new species
Figure 18. Chalceus epakros sp. nov., holotype, MZUSP 33392, 132.6 mm SL, Brazil, Pará, Rio Tapajós, São Luís, above Itaituba, 4∞25¢S; 56∞10¢W.
Figure 12 in Taxonomic revision of the South American fish genus Chalceus Cuvier (Teleostei: Ostariophysi: Characiformes) with the description of three new species
Figure 12. Chalceus erythrurus, juvenile, USNM 308820, 28.8 mm SL, Brazil, Amazonas, Manaus, Lago Janauari, small house in front of brickworks.
Figure 14 in Taxonomic revision of the South American fish genus Chalceus Cuvier (Teleostei: Ostariophysi: Characiformes) with the description of three new species
Figure 14. Map of northern portion of South America showing geographical distribution of Chalceus erythrurus (dots, 1 = type locality) and C. spilogyros sp. nov. (diamonds, 2 = type locality) (some symbols represent more than one locality or lot of specimens).
Figure 23 in Taxonomic revision of the South American fish genus Chalceus Cuvier (Teleostei: Ostariophysi: Characiformes) with the description of three new species
Figure 23. Chalceus guaporensis sp. nov., paratype, UMMZ 204783, 80.5 mm SL, Bolívia, Rio Baurés, 400 m above mouth on left bank, 6 km SW Costa Marques (Brazil),12∞34¢6¢S; 64∞19¢W.
Figure 10. Chalceus erythrurus, AMNH 78064, 139.0 in Taxonomic revision of the South American fish genus Chalceus Cuvier (Teleostei: Ostariophysi: Characiformes) with the description of three new species
Figure 10. Chalceus erythrurus, AMNH 78064, 139.0 mm SL, Peru, Loreto, Río Yarapa, tributary of Río Ucayali, one of several sites along a 10-km stretch of river.
Figure 22 in Taxonomic revision of the South American fish genus Chalceus Cuvier (Teleostei: Ostariophysi: Characiformes) with the description of three new species
Figure 22. Chalceus guaporensis sp. nov., holotype, UMMZ 239851, 112 mm SL, Bolívia, Beni, Rio Itenez at mouth of Rio Baurés, 6 km SW Costa Marques (Brazil), 12∞31¢S; 64∞19¢W.
Figure 15 in Taxonomic revision of the South American fish genus Chalceus Cuvier (Teleostei: Ostariophysi: Characiformes) with the description of three new species
Figure 15. Chalceus spilogyros sp. nov., holotype, MZUSP 20314, 208.0 mm SL, Brazil, Pará, Igarapé Jacaré, right margin of Rio Tapajós, near Boim, 3∞0¢S; 55∞15¢W.
Figure 8 in Taxonomic revision of the South American fish genus Chalceus Cuvier (Teleostei: Ostariophysi: Characiformes) with the description of three new species
Figure 8. Chalceus macrolepidotus, syntypes of Chalceus ararapeera, MNHN A9830, 66.9–80.2 mm SL, Guyana, Essequibo River.
Figure 19 in Taxonomic revision of the South American fish genus Chalceus Cuvier (Teleostei: Ostariophysi: Characiformes) with the description of three new species
Figure 19. Chalceus epakros sp. nov., INPA 16926, 95.6 mm SL, Brazil, Pará, Rio do Côco, Caseara, Lago do Casé.
Figure 4. Chalceus macrolepidotus, ANSP 176678, 200.3 in Taxonomic revision of the South American fish genus Chalceus Cuvier (Teleostei: Ostariophysi: Characiformes) with the description of three new species
Figure 4. Chalceus macrolepidotus, ANSP 176678, 200.3 mm SL, Guyana, Siparuni River at Tumbledown Rapids, 4∞48¢39≤N, 58∞51¢11≤W.
Figure 5. Chalceus macrolepidotus, MZUSP 66482, 91.6 in Taxonomic revision of the South American fish genus Chalceus Cuvier (Teleostei: Ostariophysi: Characiformes) with the description of three new species
Figure 5. Chalceus macrolepidotus, MZUSP 66482, 91.6 mm SL, Brazil, Amazonas, Rio Tiquié, about 1 h downriver from the Indian community of Cunuri, below Cachoeira do Tucano.
Figure 7 in Taxonomic revision of the South American fish genus Chalceus Cuvier (Teleostei: Ostariophysi: Characiformes) with the description of three new species
Figure 7. Chalceus macrolepidotus, holotype, MNHN 2634, 144.6 mm SL, Brazil.
FIGURE 4. Tetragonopterus chalceus. a in Revision of the South American genus Tetragonopterus Cuvier, 1816 (Teleostei: Characidae) with description of four new species
FIGURE 4. Tetragonopterus chalceus. a) MZUSP 115276, Paranatinga, Rio Culuene, Xingu basin; b) Brazil, Goiás, Brejinho de Nazaré, Rio Crixás, Rio Tocantins. Photo (b) by M. Taylor.
Fig. 2 in Sperm evolution in the family Alestidae with comparative data for the genus Chalceus (Ostariophysi: Characiformes)
Fig. 2. Spermatozoon of Bryconalestes longipinnis. a, b, c: longitudinal sections. d, e, f, g, h: transverse sections from top to posterior region. The nucleus (n) is spherical and lies medial to the flagellum (f). The centriolar complex (p, d) and nuclear fossa (arrow) is medial. The proximal centriole (p) is in a right angle relative to the distal centriole (d). The cytoplasmic canal is present (asterisk). The midpiece (pi) is asymmetrical, and contains the spherical mitochondria (m), vesicles (v) and a cytoplasmic sleeve (arrowhead). The flagellum has lateral fins (fi). Legends: cr: concentric membranous rings, d: distal centriole, f: flagellum, fi: lateral fins, m: mitochondria, n: nucleus, p: proximal centriole, v: vesicle, asterisk: cytoplasmic canal, arrow: nuclear fossa, arrowhead: cytoplasmic sleeve.
Fig. 3 in Sperm evolution in the family Alestidae with comparative data for the genus Chalceus (Ostariophysi: Characiformes)
Fig. 3. Spermatozoon of Alestopetersius compressus. a, b, c: longitudinal sections. d, e, f: transverse sections from top to posterior region. The nucleus (n) is spherical and lies eccentric to the flagellum (f). The centriolar complex (p, d) and nuclear fossa (arrow) is eccentric. The proximal centriole (p) is oblique relative to the distal centriole (d). The cytoplasmic canal is present (asterisk). The midpiece (pi) is strongly asymmetrical, and contains the spherical mitochondria (m) and vesicles (v). The flagellar membrane has some vesicles and the flagellum. Legends: d: distal centriole, f: flagellum, m: mitochondria, n: nucleus, p: proximal centriole, v: vesicle, asterisk: cytoplasmic canal, arrow: nuclear fossa.
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