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.
| Fertebratau | |
|---|---|
 | |
| Dosbarthiad gwyddonol | |
| Teyrnas: | Animalia |
| Ffylwm: | Chordata |
| Is-ffylwm: | Vertebrata |
| Dosbarthiadau traddodiadol | |
|
Agnatha | |
Dosbarthiad ffylogenetig
Hyperoartia (llysywod pendoll)
Gnathostomata
- Chondrichthyes (pysgod cartilagaidd)
- Osteichthyes (pysgod esgyrnog)
- Actinopterygii
- Sarcopterygii
- Actinistia (selacanthod)
- Dipnoi (pysgod ysgyfeiniog)
- Tetrapoda
- Lissamphibia (amffibiaid modern)
- Amniota
- Sauropsida
- Testudinia (crwbanod)
- Diapsida
- Lepidosauria (madfallod a nadroedd)
- Archosauria
- Crocodilia (crocodeilod)
- Dinosauria (deinosoriaid)
- Aves (adar)
- Synapsida
- Mammalia (mamaliaid)
- Sauropsida
Oriel
Pysgodyn di-ên
Pysgodyn cartilagaidd
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