Y grŵp mwyaf o bysgod yw'r pysgod esgyrnog. Mae mwy na 26,000 o rywogaethau. Mae ganddynt sgerbwd o asgwrn yn hytrach na chartilag.
| Pysgod esgyrnog | |
|---|---|
 | |
| Dosbarthiad gwyddonol | |
| Teyrnas: | Animalia |
| Ffylwm: | Chordata |
| Is-ffylwm: | Vertebrata |
| Uwchddosbarth: | Huxley, 1880 |
| Dosbarthiadau | |
|
Actinopterygii | |
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