General information |
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| Megaleporinus obtusidens (Valenciennes, 1837) | ||
| Synonyms |
- |
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| IUCN Red List status (2014) | Not Reported |
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| Habitat | - |
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| Systematics |
Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Actinopterygii; Neopterygii; Teleostei; Ostariophysi; Characiformes; Characoidei; Anostomidae. |
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| Geographical distribution | - |
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| Occurrence | - | |
| Importance | ||
| Remarks | Iguacu river population revealed single p terminal 5S rDNA cluster in m pair 5 and a single q terminal 18S rDNA site in sm pair 15. In Piumhi River population, 5S rDNA located at p terminal region of the m pair 8, while 18S was identified at p terminal region of m pair 5. |
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Karyological information |
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| Geographical area of study | Iguacu River (Iguacu River basin) in Uniao da Vitoria, Parana´ and Piumhi River (Sao Francisco River) in Piumhi, Minas Gerais, Brazil. | |
| Source of chromosomes | Kidney |
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| Number of specimens with sex | - |
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| Diploid chromosome number | 54 |
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| Karyotype formula | 28m+26sm |
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| Fundamental arm number | 108 |
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| Chromosome length | - |
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| Sex chromosome | Female possess 28m+25sm+1st karyotype. Difference in male/female karyotype indicate ZZ/ZW sex system |
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| Chromosome staining/banding/FISH | C-banding revealed small amounts of heterochromatic at pericentromeric region of some autosomes. W chromosome presented a large heterochromatic block comprised nearly entire q arm. Z chromosome characterized by a small heterochromatin segment from middle to distal position on q arms. |
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| Reference(s) |
Dulz TA, Azambuja M, Nascimento VD, Lorscheider CA, Noleto RB, Moreira-Filho O, Nogaroto V, Diniz D, de Mello Affonso PRA, Vicari MR (2020). Karyotypic diversification in two Megaleporinus species (Characiformes, Anostomidae) inferred from in situ localization of repetitive DNA sequences. Zebrafish, 333-341. http://doi.org/10.1089/zeb.2020.1918 |
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