Steatogenys elegans ';
General information
 
Steatogenys elegans (Steindachner, 1880)
 
 
Common nameBarred 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, Colombia, Peru, Venezuela, Ecuador, 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(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.