Fish

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Jawless fishes'''

Chondrichthyes (Cartilaginous fishes)

Actinopterygii (Ray-finned fishes) Sarcopterygii (Lobe-finned fishes)
 * Dalophis imberbis (Finless Eel) (n=23, ZZ, ZW)
 * Leporinus elongatus  (2n=54, ZZ, ZW, W larger than Z)
 * Liposarcus anisitsi  (2N=52, No morphologically heteromorphic sex chromosomes)
 * Triportheus elongatus  (2n=52, ZZ, ZW)
 * Triportheus guentheri  (2n=52, ZZ, ZW)
 * Triportheus paranense  (2n=52, ZZ, ZW)