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Fertebrat
| Fertebratau | |
|---|---|
| |
| Dosbarthiad gwyddonol | |
| Teyrnas: | Animalia |
| Ffylwm: | Chordata |
| Is-ffylwm: | Vertebrata |
| Dosbarthiadau traddodiadol | |
|
Agnatha | |
Is-ffylwm o anifeiliaid cordog ag asgwrn cefn a chymesuredd dwyochrol yw fertebratau (neu anifeiliaid asgwrn-cefn). Maen nhw'n cynnwys pysgod, amffibiaid, ymlusgiaid, adar a mamaliaid. Mae ganddynt asgwrn cefn cylchrannog, mewnysgerbwd cymalog, naill ai cartilagaidd neu esgyrnog, ac ymennydd mawr wedi'i amgáu mewn penglog.
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