Rhestr pysgod, molysgiaid, cramenogion ayyb.
Pysgod a molysgiaid, cramenogion ayyb. yn nhrefn yr wyddor.
Pysgod
golygu- Brithyll, -iaid (Trout)
- Brithyll y môr (Sea trout: Salmo trutta trutta)
- Cegddu (European hake: Merluccius merluccius)
- Celog (Pollock: Pollachius virens)
- Ci pigog (Spiny Dogfish: Squalus acanthias)
- Corbennog (European sprat: Sprattus sprattus)
- Draenogyn neu draenogiad (Perch: Perca)
- Draenog y môr, draenogiaid y môr (Bass: Dicentrarchus labrax)
- Eog, -iaid (Salmon: Salmonidae)
- Gwangen (Twaite shad: Alosa fallax)
- Gwyniad (Coregonus lavaretus)
- Gwyniad Môr (Whiting/Wittling: Merlangius merlangus)
- Gypi (Guppy: Poecilia reticulata)
- Hadog (Haddock: Melanogrammus aeglefinus)
- Herlyn (Allis shad: Alosa alosa)
- Heulgi (Basking shark: Cetorhinus maximus)
- Honos (Ling: Molva molva)
- Iâr fôr (Lumpsucker: Cyclopterus lumpus)
- Lamprai, lampreiod (Lamprey)
- Lleden
- Lleden fair (Common megrim: Lepidorhombus whiffiagonis)
- Lleden fwd (Flounder: Platichthys flesus neu Platichthys stellatus)
- Lleden goch (Plaice: Pleuronectes platessa)
- Lleden lefn (Sole: Solea vulgaris)
- Lleden y laid (Dab: Limanda limanda)
- Llysywen (Eel: Anguilliformes, Anguilla anguilla)
- Macrell (Mackerel: Scomber)
- Marchfacrell (Mackerel: Trachurus)
- Mingryniad (Mullet: Muglidae)
- Mingryniad coch (Goatfish: Mullidae)
- Morgath (Common skate: Raja batis)
- Morgi, morgwn (Shark)
- Morlas (Pollack: Pollachius pollachius)
- Mornodwydd (Needlefish: Belonidae)
- Penfras (Cod: Gadus morhua)
- Penhwyad (pike: Esox lucius)
- Pennog, penwaig (Herring: Clupea harengus)
- Safngrwn (Hagfish: Myxine glutinosa)
- Sardîn (Sardine: Sardina pilchardus)
Molysgiaid, cramenogion ayyb.
golygu- Cimwch, cimychiaid (Lobster: Nephropidae)
- Cimwch crafangau gwyn dŵr croyw (White-clawed crayfish: Austropotamobius pallipes)
- Cocysen, cocos (Cockle: Cardiidae)
- Corgimwch, (Prawns: Suborder: Dendrobranchiata")
- Cragen, cregyn (Shell)
- Cragen adain (Fan mussel: Atrina fragilis)
- Cragen crib (Topshell: Gibbula)
- Cragen glas (Mussle)
- Cragen llong (Barnacle: Cirripedia)
- Cragen moch (Common Whelk: Buccinum undatum)
- Cranc, -od (Crab)
- Cwrel (Solitary coral: Caryophyllia inornata)
- Cyllell y môr, cyllyll y môr (Razorshell: Ensis Arcuatus)
- Deudroediad -iaid (Amphipod: Amphipoda)
- Gele feddyginiathol (Medicinal leech: Hirudo medicinalis)
- Gwichiad, -iaid (Periwinkle)
- Gwichiad moch (Whelk)
- Llygad meheryn, llygaid meheryn (Limpet)
- Llymarchen wystrysen (Oyster: Ostrea edulis)
- Malwen (Snail)
- Malwen droellog (Narrow-mouth whorl snail: Vertigo angustior neu Geyeri's whorl snail: Vertigo geyeri)
- Malwen droellog Desmoulin (Desmoulin's whorl snail: Vertigo moulinsiana)
- malwen lysnafeddog (Glutinous snail: Myxas glutinosa)
- Misglen (Freshwater pea mussel: Pisidium tenuilineatum)
- Misglen berlog yr afon (Freshwater pearl mussel: Margaritifera margaritifera)
- Misglen yr afon (Depressed river mussel: Pseudanodonta complanata)
- Môr-wyntyll pinc (Pink sea fan: Eunicella verrucosa)
- Perdysen (Shrimp: Infraorder: Caridea)
- Seren môr, sêr môr (Starfish: Asteroidea)
- Seren môr clustog (Cushioned starfish: Asterina phylactica)
- Sgalop (Scallop: teulu; Pectinidae)
- Wystrysen (Oyster: Ostrea edulis)