| General information |
|
Steatogenys elegans (Steindachner, 1880) |
|
| |
|
| Common name | Barred knifefish |
| Valid name |
Steatogenys elegans (Steindachner, 1880) |
| Synonyms |
- |
| IUCN Red List status (2014) |
Least Concern (LC) |
| Habitat |
Freshwater |
| Systematics |
Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Actinopterygii; Neopterygii; Teleostei; Ostariophysi; Gymnotiformes; Sternopygoidei; Hypopomidae. |
| Geographical distribution |
Brazil; Colombia; Peru; Venezuela; Ecuador; Guyana |
| Occurrence |
native: Brazil; native: Colombia; native: Peru; native: Venezuela; native: Ecuador; native: Guyana |
| Importance |
Aquarium, commercial |
| Remarks |
|
| Karyological information |
| Geographical area of study |
Specimens were collected in rivers from the localities namely Rio Caripetuba (Abaetetuba, PA), Rio Arienga (Barcarena, PA), Rios from RDSM (AM), Lago de Tefe´ (Tefe´, AM). |
| Source of chromosomes |
|
| Number of specimens with sex |
42 (22 males, 15 females, 5 undefined) |
| Diploid chromosome number |
50 |
| Karyotype formula |
12m-sm/38st-a |
| Fundamental arm number |
62 |
| Chromosome length |
Not reported |
| Sex chromosome |
ZZ/ ZW sex chromosome system |
| Chromosome staining/banding/FISH |
Constitutive heterochromatin (CH) was observed in the centromeric regions of all chromosomes. Interstitial heterochromatic bands were also present on the long arms of pair number 1 and W chromosome. Nucleolar organizer regions (NORs) were identified in the distal regions of the short arms of pair 4 and the CMA3 fluorochrome coincided with the NORs. The DAPI fluorochrome coincided with the CH and was very intense for chromosome pair 5 and chromosme W. |
| Reference |
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. |
| Cross Link |