Y gwahaniaeth rhwng diwygiadau o "Rygbi'r undeb"

:Rhif 1 [[Prop (rygbi)|Prop pen rhydd]] <!--- (loosehead prop)--->

:Rhif 2 [[Bachwr (rygbi)|Bachwr]] <!--- (hooker)--->

:Rhif 3 [[Prop (rygbi)|Prop pen tyn]] <!--- (tighthead prop)--->

:Rhif 4 a 5 [[Clo (rygbi)|Clo]] (x 2) <!--- (locks)--->

:Rhif 6 a 7 [[Blaenasgellwr (rygbi)|Blaenasgellwr]] (x 2) <!--- (flanker)--->

:Rhif 8 [[Wythwr (rygbi)|Wythwr]]

:Rhif 9 [[Mewnwr (rygbi)|Mewnwr]] <!--- (scrum-half)--->

:Rhif 10 [[Maswr (rygbi)|Maswr]] <!--- (fly-half)--->

:Rhif 12 a 13 [[Canolwr (Rygbirygbi) |Canolwr]] (x 2) <!--- (center)--->

:Rhif 11 a 14 [[Asgellwr (rygbi) |Asgellwr]] (x 2) <!--- (wings) --->

:Rhif 15 [[Cefnwr (rygbi)|Cefnwr]] <!--- (full back)--->