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138 results for “Characidium”
fig 3 in First records of Characidium heirmostigmata and C. serrano (Characiformes: Crenuchidae) from freshwaters of Argentina.
fig 3. (above). Characidium serrano, upon capture. MLP 10751, arroyo Shangay
fig 2 in First records of Characidium heirmostigmata and C. serrano (Characiformes: Crenuchidae) from freshwaters of Argentina.
fig 2. (above). Characidium heirmostigmata, upon capture. MLP 10750, arroyo Garuhape
fig 4 in First records of Characidium heirmostigmata and C. serrano (Characiformes: Crenuchidae) from freshwaters of Argentina.
fig 4. (right). Arroyo Shangay at low-water, río Uruguay basin, Misiones Province
Fig. 6. Z in Interspecific chromosomal divergences in the genus Characidium (Teleostei: Characiformes: Crenuchidae)
Fig. 6. Z an W sex chromosomes of the Characidium species analyzed in this study, after C-banding (first row) and silver nitrate staining (second row). Note the different distribution of the heterochromatin, mainly in the W chromosome in (a) C. schubarti, (b), Characidium sp., (c) C. pterostictum, (d) C. oiticicai, (e) C. lanei, and (f) C. lauroi.
Fig. 3 in Interspecific chromosomal divergences in the genus Characidium (Teleostei: Characiformes: Crenuchidae)
Fig. 3. Karyotypes of female specimens of Characidium pterostictum from Apiaí, SP, after conventional Giemsa staining (a) and C-banding (b). Note the differential patterns of heterochromatic blocks on the Z and W chromosomes and the heterochromatic B-chromosomes In the box, the Z and W chromosomes carrying the NORs in an inverted position. Scale bar = 10 µm.
Fig. 1 in Interspecific chromosomal divergences in the genus Characidium (Teleostei: Characiformes: Crenuchidae)
Fig. 1. Partial map of South America showing the Characidium species collection sites. 1 = Ubatuba, SP (Characidium lauroi), 2 = Salesópolis, SP (Characidium oiticicai and Characidium cf. zebra), 3 = Itanhaém, SP (Characidium sp.), 4 = Jaguariaíva, PR (Characidium schubarti), 5 = Apiaí, SP (Characidium pterostictum), 6 = Morretes, PR (Characidium lanei).
Fig. 6 in Life-history of the South American darter, Characidium pterostictum (Crenuchidae): evidence for small scale spatial variation in a piedmont stream
Fig. 6. Seasonal variation of mean condition factor (K) of Characidium pterostictum in the Lajeado river (southern Brazil). PA, upstream site; PB, downstream site. * In PA no specimen was captured in Summer.
FIG. 6 in Redescription of the Guiana Shield Darter Species Characidium crandellii and C. declivirostre (Crenuchidae) with Descriptions of Two New Species
FIG. 6. Distribution of Characidium crandellii, type locality indicated with T.
Data from: Evolution and conservation of Characidium sex chromosomes
Fish species exhibit substantial variation in the degree of genetic differentiation between sex chromosome pairs, and therefore offer the opportunity to study the full range of sex chromosome evolution. We used restriction-site associated DNA sequencing (RAD-seq) to study the sex chromosomes of Characidium gomesi, a species with conspicuous heteromorphic ZW/ZZ sex chromosomes. We screened 9863 single-nucleotide polymorphisms (SNPs), corresponding to ~1 marker/100 kb distributed across the genome for sex-linked variation. With this data set, we identified 26 female-specific RAD loci, putatively located on the W chromosome, as well as 148 sex-associated SNPs showing significant differentiation (average FST=0.144) between males and females, and therefore in regions of more recent divergence between the Z and W chromosomes. In addition, we detected 25 RAD loci showing extreme heterozygote deficiency in females but which were in Hardy–Weinberg equilibrium in males, consistent with degeneration of the W chromosome and therefore female hemizygosity. We validated seven female-specific and two sex-associated markers in a larger sample of C. gomesi, of which three localised to the W chromosome, thereby providing useful markers for sexing wild samples. Validated markers were evaluated in other populations and species of the genus Characidium, this exploration suggesting a rapid turnover of W-specific repetitive elements. Together, our analyses point to a complex origin for the sex chromosome of C. gomesi and highlight the utility of RAD-seq for studying the composition and evolution of sex chromosomes systems in wild populations.
Data from: Evolution and conservation of Characidium sex chromosomes
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FIGURE 4 in A new species of Characidium (Characiformes: Crenuchidae) from the upper rio São Francisco basin, Minas Gerais, Brazil
FIGURE 4. Sampling localities of Characidium cacah, Brazil, Minas Gerais State, rio São Francisco basin, rio das Velhas sub basin, rio Cipó drainage: (a) satellite image of a stretch of rio Cipó and surrounding lagoons (from Google Earth); (b) rio Cipó just after the meeting of rio Bocaina and rio Mascates; (c) rio Cipó at type locality; d) Lagoa do Boi.
FIGURE 1 in A new species of Characidium (Characiformes: Crenuchidae) from the upper rio São Francisco basin, Minas Gerais, Brazil
FIGURE 1. Characidium cacah: (a) holotype, MZUSP 125765, 36.5 mm SL; (b) paratype, UFBA 9056, 36.2 mm SL, in life; (c) paratype, ZUEC 17227, 36.0 mm SL; (d) paratype, ZUEC 17227, 25.6 mm SL; (e) paratype, CICMG 158, 25.3 mm SL; (f) paratype, MCNIP 4530, 21.0 mm SL. All from Brazil, Minas Gerais State, rio São Francisco basin, rio das Velhas sub-basin, rio Cipó drainage.
FIGURE 2 in A new species of Characidium (Characiformes: Crenuchidae) from the upper rio São Francisco basin, Minas Gerais, Brazil
FIGURE 2. Pseudotympanum of Characidium cacah, paratype CICMG 158, 35.6 mm SL, lateral view, right side.
FIGURE 2 in A new species of Characidium Reinhardt (Characiformes: Crenuchidae) with a unique mid-water behavior from the upper rio Madeira basin, Brazil
FIGURE 2. Map of the upper and middle Rio Madeira basin and adjoining river basins, showing the type locality of Characidium barbosai (red star).
FIGURE 3 in A new species of Characidium Reinhardt (Characiformes: Crenuchidae) with a unique mid-water behavior from the upper rio Madeira basin, Brazil
FIGURE 3. Lateral view of head of (A) Characidium barbosai, ANSP 207590, 42.2 mm SL; (B) Characidium etheostoma, ZUEC 16947, 42.2 mm SL; (C) C. lauroi, ZUEC 5559, 60.9 mm SL; and (D) C. steindachneri, ZUEC 10623, 40.5 mm SL, showing distinct degrees of development of the preorbital and postorbital stripes in the genus: (A) preorbital and postorbital stripes absent; (B) preorbital and postorbital stripes present and complete; (C) preorbital stripe complete, postorbital stripe incomplete; (D) preorbital stripe complete, postorbital stripe absent.
FIGURE 1 in A new species of Characidium Reinhardt (Characiformes: Crenuchidae) with a unique mid-water behavior from the upper rio Madeira basin, Brazil
FIGURE 1. Characidium barbosai: (A) holotype, ZUEC 17139, 42.5 mm SL; (B) paratype, ZUEC 17140, 30.4 mm SL; both from Brazil, Mato Grosso, córrego Longa Vida, rio Guaporé basin.
FIGURE 8 in The unknown diversity of the genus Characidium (Characiformes: Crenuchidae) in the Chocó biogeographic region, Colombian Andes: Two new species supported by morphological and molecular data
FIGURE 8 Detail in the shape of the first rib (a)–(c) and swimbladder (b)–(d) in (a) and (b). C. tatama n. sp. (b, ventral view) IMCN 8924 (1C&S) and (c) and (d) C. dule n. sp. (d, dorsal view) IMCN 8929 (1C&S). The right lobule in (d) is damaged. Scale bar = 1 mm
FIG. 10 in Redescription of the Guiana Shield Darter Species Characidium crandellii and C. declivirostre (Crenuchidae) with Descriptions of Two New Species
FIG. 10. Lateral view (top) of Characidium duplicatum, new species, in life and dorsal, lateral, and ventral views after preservation, CSBD F-3614, holotype, 39.4 mm SL. Photos by J. W. Armbruster.
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