General information
Astyanax ribeirae Eigenmann, 1911  
   
Valid name Deuterodon ribeirae (Eigenmann, 1911)
Synonyms
-
IUCN Red List status (2014)
Not Reported
Habitat
Freshwater
Systematics
Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Actinopterygii; Neopterygii; Teleostei; Ostariophysi; Characiformes; Characidae.
Geographical distribution Brazil
Occurrence native: Brazil
Remarks
Karyological information
Geographical area of study Ribeira de Iguape river basin, São Paulo State, Brazil
Source of chromosomes
Number of specimens with sex 24
Diploid chromosome number 50
Karyotype formula 4m +10sm+ 6st+30a
Fundamental arm number 70
Chromosome length
Sex chromosome
Chromosome staining/banding/FISH The silver nitrate staining revealed single NORs on ST/A chromosomes. C-banding revealed little amounts of constitutive heterochromatin, located at pericentromeric region of some chromosomes. Four minute sites of 18S rDNA were located by FISH at short arms of middle-sized acrocentric pairs. Six 5SrDNA sites were observed at the terminal region on short arms of a middle sized acrocentric pair and on two small acrocentric pairs.
Reference Kavalco KF, Pazza R, de Almeida-Toledo LF (2010). Molecular cytogenetics of Astyanax ribeirae (Teleostei, Characidae), an endemic characin of the Atlantic rainforest. Nucleus, 53(1):51-54.
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