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Cytogenetic data on four species of Gymnotus. ITS – Interstitial Telomeric Sites; (I) – Interstitial mark.
| Species | 5S rDNA | 18S rDNA | ITS | CMA3 | Karyotypic formulae |
|---|---|---|---|---|---|
| Gymnotus sylvius | Pair 4 | 2 (I) | Pair 1 | Pairs 1,2 and 16 | 22m+12sm+6st |
| Gymnotus inaequilabiatus | Up to17 pairs | 1 (I) | -- | Pair 1 | 42m+10sm+2a |
| Gymnotus pantherinus | Pairs 3 and 5 | 1 (I) | -- | Pairs 1,3, 4 and 12 | 32m+18sm+2st |
| Gymnotus cf. carapo | Up to 15 pairs | 1 (I) | -- | Pair 1 | 38m+12sm+4st |
