Rhestr mamaliaid Cymru
Artiodactyla (Carnolion eilrif-fyseddog)[golygu | golygu cod]
- Baedd gwyllt (Sus scrofa) – rhywogaeth ddiflanedig yng Nghymru
- Carw coch (Cervus elaphus)
- Carw mwntjac (Muntiacus reevesi) – rhywogaeth estron
- Carw sica (Cervus nippon) – rhywogaeth estron
- Danas (Dama dama) - Fallow deer – rhywogaeth estron hirsefydlog
- Iwrch (Capreolus capreolus) - Roe deer
Carnivora (Cigysyddion)[golygu | golygu cod]
- Bele goed (Martes martes)
- Carlwm (Mustela erminia)
- Cath goed (Felis silvestris) – rhywogaeth ddiflanedig yng Nghymru
- Dwrgi (Lutra lutra)
- Ffwlbart (Mustela putorius)
- Gwenci (Mustela nivalis)
- Llwynog (Vulpes vulpes)
- Minc (Neovison vison) – rhywogaeth oresgynnol estron
- Mochyn daear (Meles meles)
Chiroptera (Ystlumod)[golygu | golygu cod]
- Ystlum adain lydan (Eptesicus serotinus) - serotine bat
- Ystlum barfog (Myotis mystacinus) - whiskered bat
- Ystlum Bechstein (Myotis bechsteinii) - Bechstein's bat
- Ystlum Brandt (Myotis brandtii) - Brandt's bat
- Ystlum du (Barbastella barbastellus) - barbastelle bat
- Ystlum hirglust (Plecotus auritus) - brown long-eared bat
- Ystlum hirglust llwyd (Plecotus austriacus) - grey long-eared bat
- Ystlum Leisler (Nyctalus leisleri) = Leisler's bat/Lesser noctule bat
- Ystlum lleiaf (Pipistrelle pipistrellus) - common pipistrelle bat + (Pipistrellus pygmaeus) - soprano pipistrelle bat
- Ystlum mawr (Nyctalus noctula) - noctule bat
- Ystlum Natterer (Myotis nattereri) - Natterer's bat
- Ystlum pedol lleiaf (Rhinolophus hipposideros) - lesser horseshoe bat
- Ystlum pedol mwyaf (Rhinolophus ferrumequinum) - greater horseshoe bat
- Ystlum y dŵr (Myotis daubentonii) - Dubenton's bat
Eulipotyphla (Pryfysorion)[golygu | golygu cod]
- Draenog (Erinaceus europaeus)
- Llyg cyffredin (Sorex araneus)
- Llyg lleiaf (Sorex minutus)
- Llyg y dŵr (Neomys fodiens)
- Twrch daear (Talpa europaea)
Lagomorpha (Ceinachffurfiaid)[golygu | golygu cod]
- Cwningen Ewropeaidd (Oryctolagus cuniculus)
- Ysgyfarnog (Lepus europaeus)
Pinnipedia (Morloi)[golygu | golygu cod]
- Morlo cyffredin (Phoca vitulina)
- Morlo llwyd (Halichoerus grypus)
Rodentia (Cnofilod)[golygu | golygu cod]
- Afanc (Castor fiber) – rhywogaeth ddiflanedig yng Nghymru
- Gwiwer goch (Sciurus vulgaris)
- Gwiwer lwyd (Sciurus carolinensis) – rhywogaeth oresgynnol estron
- Llygoden bengron goch (Myodes glareolus) - bank vole
- Llygoden bengron Sgomer (Myodes glareolus skomerensis)
- Llygoden bengron y dŵr (Arvicola amphibius) - water vole
- Llygoden bengron y gwair (Microtus agrestis) - field vole
- Llygoden ddu (Rattus rattus) - black rat
- Llygoden fronfelen (Apodemus flavicollis)
- Llygoden ffyrnig (Rattus norvegicus) - brown rat
- Llygoden y coed (Apodemus sylvaticus)
- Llygoden y tŷ (Mus musculus)
- Llygoden yr ŷd (Micromys minutus)
- Pathew (Muscardinus avellanarius)