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Urdd o adar yw'r Pteroclidiformes a'r Teulu yw'r Pteroclididae. Yr enw a ddefnyddir yn gyffredin am y grŵp hwn yw Ieir y diffeithwch. Ceir 16 rhywogaeth yn y teulu Pteroclidiformes. Fe'u rhoddir mewn dau genws: yr enw ar y dosbarthiad Asiaidd yw Syrrhaptes a'r enw ar yr 14 arall yw Pterocles.[1]
| Ieir y diffeithwch | |
|---|---|
 | |
| Iâr diffeithwch ddwyres | |
| Dosbarthiad gwyddonol | |
| Teyrnas: | Animalia |
| Ffylwm: | Chordata |
| Dosbarth: | |
| Urdd: | Pteroclidiformes |
| Teulu: | Pteroclididae |
| Genera | |
| |
Ar y ddaear, ar dir fel glaswelltiroedd a safanas mae'n nhw'n treulio eu hamser, nid ar goed. Fe'u gwelir yn Affrica, y Dwyrain Canol ac o India hyd at canol Asia.
Rhestr Wicidata:
| teulu | enw tacson | delwedd |
|---|---|---|
| Iâr diffeithwch | Syrrhaptes paradoxus | .jpg) |
| Iâr diffeithwch Burchell | Pterocles burchelli |  |
| Iâr diffeithwch India | Pterocles indicus |  |
| Iâr diffeithwch Lichtenstein | Pterocles lichtensteinii |  |
| Iâr diffeithwch Madagasgar | Pterocles personatus |  |
| Iâr diffeithwch Namaqua | Pterocles namaqua |  |
| Iâr diffeithwch Tibet | Syrrhaptes tibetanus |  |
| Iâr diffeithwch ddwyres | Pterocles bicinctus |  |
| Iâr diffeithwch dorddu | Pterocles orientalis |  |
| Iâr diffeithwch dorwen | Pterocles decoratus |  |
| Iâr diffeithwch frech | Pterocles senegallus |  |
| Iâr diffeithwch goronog | Pterocles coronatus |  |
| Iâr diffeithwch resog | Pterocles quadricinctus |  |
| Iâr diffeithwch winau | Pterocles exustus |  |
| Iâr diffeithwch yddf-felen | Pterocles gutturalis |  |
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