Species;"A. abramis";"A. asuncionensis";"A. correntinus";"Astyanax sp." 2n;50;50;36;50 "Karyotype formula";4m+30sm+8st+8a;8m+24sm+6st+12a;4m+26sm+8st+12a;12m+16sm+2st+6a AgNORs;"Single: - pair 22, a, tel, p arm";"Single: - pair 20, a, tel, p arm";"Multiple: - pair 12, sm, tel, p arm - pair 15, st, tel, q arm - pair 16, a, tel, q arm - pair 17, a, bitel";"Single: - pair 25, a, tel, p arm" "Heterochromatin (C-banding)";"Centromeric, pericentromeric and telomeric";"Centromeric, pericentromeric and telomeric";"Centromeric and telomeric";"Pericentromeric and telomeric" "18S rDNA";"Single: - pair 22, a, tel, p arm";"Single: - pair 20, a, tel, p arm";"Multiple: - pair 4, m, tel, q arm - pair 9, sm, tel, q arm - pair 12, sm, tel, p arm - pair 15, st, tel, q arm - pair 16, a, tel/bitel - pair 17, a, tel/bitel - pair 18, a, tel, p arm";"Single: - pair 25, a, tel, p arm" "5S rDNA";"Single: - pair 7, sm, cent";"Single: - pair 9, sm, cent";"Multiple: - pair 2, m, cent - pair 4, m, cent - pair 12, sm, cent";"Multiple: - pair 4, sm, cent - pair 21, a, tel"