General information |
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| Steatogenys duidae (La Monte, 1929) | ||
| Common name | Sarrapu | |
| Valid name | Steatogenys duidae (La Monte, 1929) | |
| Synonyms |
- |
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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; Hypopomidae. |
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| Geographical distribution | Brazil; Venezuela |
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| Occurrence | Native: Brazil, Venezuela |
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| Importance | ||
| Remarks | ||
Karyological information |
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| Geographical area of study | Specimens were collected in rivers from the localities namely Igarape´ Mato Grosso (Novo Aira˜o, AM) and Aiana˜ (AM). | |
| Source of chromosomes | ||
| Number of specimens with sex | 12 (7 males, 4 females, 1 undefined) |
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| Diploid chromosome number | 50 |
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| Karyotype formula | 50m-sm |
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| Fundamental arm number | 100 |
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| Chromosome length | Not reported |
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| Sex chromosome | Not reported |
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| Chromosome staining/banding/FISH | Constitutive heterochromatin (CH) was observed in the centromeric and pericentromeric regions of all chromosomes, and also as small bands on the proximal long arms of pairs 2, 3, 5 and 7. Nucleolar organizer regions (NORs) were identified in the distal region of the short arms of 14 and the CMA3 fluorochrome coincided with the NORs. The DAPI fluorochrome (specific to A-T rich regions) coincided with the CH. |
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| Reference(s) |
Cardoso AL, Pieczarka JC, Feldberg E, Milhomem SSR, Moreira-Almeida H, Silva DDS, da Silva PC, Nagamachi CY (2011). Chromosomal characterization of two species of genus Steatogenys (Gymnotiformes: Rhamphichthyoidea: Steatogenini) from the Amazon basin: sex chromosomes and correlations with Gymnotiformes phylogeny. Review in Fish Biology and Fisheries, 21:613–621. |
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