| General information |
|
Potamotrygon orbignyi (Castelnau, 1855) |
|
| |
|
| Common name | Smooth back river stingray, Arraia |
| Synonyms |
|
| IUCN Red List status (2014) |
Not Reported |
| Habitat |
Freshwater |
| Systematics |
Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Chondrichthyes; Elasmobranchii; Batoidea; Myliobatiformes; Potamotrygonidae. |
| Geographical distribution |
Brazil; Venezuela; Guyana; Suriname; French Guiana |
| Occurrence |
native: Brazil; native: Venezuela; native: Guyana; native: Suriname; native: French Guiana |
| Importance |
Food |
| Karyological information |
| Geographical area of study |
Daraqua, Itu, Ariraha rivers; Zamula stream,middle Negro River, Barcelos, Amazonas, Manaus |
| Source of chromosomes |
Kidney,epigonal organ and spleen |
| Number of specimens with sex |
07 females |
| Diploid chromosome number |
66 |
| Karyotype formula |
22M+10SM+8ST+26A |
| Fundamental arm number |
106 |
| Chromosome length |
Not reported |
| Sex chromosome |
Not detected |
| Chromosome staining/banding/FISH |
NORs were located in terminal regions, on long arms of up to eight chromosomes |
| Reference |
Valentim FC, Falcao JN, Porto JIR, Feldberg E (2006). Chromosomes of three freshwater stingrays (Rajiformes Potamotrygonidae) from the Rio Negro basin, Amazon, Brazil. Genetica,128:33-39. |
| Cross Link |