| General information |
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Oligosarcus hepsetus (Cuvier, 1829) |
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| Common name | Tambicu |
| Synonyms |
- |
| IUCN Red List status (2014) |
Not Reported |
| Habitat |
Freshwater |
| Systematics |
Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Actinopterygii; Neopterygii; Teleostei; Ostariophysi; Characiformes; Characidae. |
| Geographical distribution |
Brazil; Argentina; Uruguay |
| Occurrence |
native: Brazil; native: Argentina; native: Uruguay |
| Remarks |
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| Karyological information |
| Record 1 |
| Geographical area of study |
Itimirim river (Iguape, São Paulo), Brazil |
| Source of chromosomes |
Kidney and gill cells. |
| Number of specimens with sex |
1 male |
| Diploid chromosome number |
50 |
| Karyotype formula |
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| Fundamental arm number |
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| Chromosome length |
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| Sex chromosome |
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| Chromosome staining/banding/FISH |
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| Reference |
Carvalho ML, Oliveira C, Navarrete MC, Froehlich O, Foresti F (2002). Nuclear DNA content determination in Characiformes fish (Teleostei, Ostariophysi) from the Neotropical region. Genetics and Molecular Biology, 25(1): 49-55. |
| Record 2 |
| Geographical area of study |
Paraitinga River & Jacui Stream in Paraı´ba do Sul River Basin, Brazil. |
| Source of chromosomes |
- |
| Number of specimens with sex |
10 (4 male, 6 female) |
| Diploid chromosome number |
50 |
| Karyotype formula |
6m+10sm+16st+18a |
| Fundamental arm number |
82 |
| Chromosome length |
- |
| Sex chromosome |
- |
| Chromosome staining/banding/FISH |
Single NOR on chromosome pair 17, with an intra-population homomorphic/ heteromorphic NOR size variation. Two heterochromatic regions located on pair Nos. 8, 17 were CMA3 staining positive. 18S rDNA probe identified four signals on pair Nos. 17, 23, confirming also size heteromorphism for pair No. 17. Four 5S rDNA positive signals observed in two chromosome pairs. C-positive bands were restricted on terminal (pair Nos. 8, 11, 13) and pericentromeric regions (pair Nos. 11, 17) of few chromosomes. |
| Reference |
Kavalco KF, Pazza R, Bertollo LAC, Moreira-Filho O (2005). Molecular cytogenetics of Oligosarcus hepsetus (Teleostei, Characiformes) from two Brazilian locations, Genetica, 124: 85–91. |
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