General information |
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| Eigenmannia virescens (Valenciennes, 1836) | ||
| Common name | Glass knifefish, Tuvira | |
| Synonyms |
Sternachus virescens Valenciennes, 1836 Sternatchus virescens Valenciennes, 1836 Sternopygus tumifrons Muller & Troschel, 1849 Sternopygus lineatus Muller & Troschel, 1849 Eigenmannia lineata (Muller & Troschel, 1849) |
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| IUCN Red List status (2014) | Not Reported |
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| Habitat | Freshwater |
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| Systematics |
Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Actinopterygii; Neopterygii; Teleostei; Ostariophysi; Gymnotiformes; Sternopygoidei; Sternopygidae. |
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| Geographical distribution | Brazil; Argentina; Colombia; Peru; Venezuela; Ecuador; Uruguay; Guyana; Suriname; French Guiana |
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| Occurrence | Native: Brazil, Argentina, Colombia, Peru, Venezuela, Ecuador, Uruguay, Guyana, Suriname, French Guiana |
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| Importance | Food |
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| Remarks | Nil |
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Karyological information |
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| Geographical area of study | Tributaries of Mogi-Guaçu and Tietê river systems, Upper Parana´ river basin in Brazil. | |
| Source of chromosomes | Kidney cells. |
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| Number of specimens with sex | 8 male, 25 female (Mogi-Guaçu river); 59 male, 47 female (Tietê river) |
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| Diploid chromosome number | 38 |
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| Karyotype formula | 16m/sm+2st+20a |
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| Fundamental arm number | - |
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| Chromosome length | - |
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| Sex chromosome | Mogi-Guaçu population showed undifferentiated sex chromosomes, while Tietê population with XX:XY sys |
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| Chromosome staining/banding/FISH | Pericentromeric constitutive heterochromatin detected in all chromosomes, where pair no. 3 presents a heavy staining in the short arm. Chromosome pair 15 is NOR bearing at short arm. NORs brightly stained with CMA3 in both sexes. |
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| Reference(s) |
de Almeida-Toledo LF, Foresti F, Péquignot EV, Daniel-Silva MFZ (2001). XX:XY sex chromosome system with X heterochromatinization: an early stage of sex chromosome differentiation in the Neotropic electric eel Eigenmannia virescens. Cytogenet. Cell Genet., 95: 73–78. |
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