Rhestr o greaduriaid morol gwledydd Prydain
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Dyma restr o greaduriaid a ellir eu canfod ar arfordiroedd gwledydd Prydain; daw'r enwau Cymraeg o gronfa Cymdeithas Edward Llwyd o enwau.
- Cymraeg - Saesneg - Lladin
- Merfog, Common bream, Abramis brama
- Gwrachen Gennog, Scale-rayed wrasse, Acantholabrus palloni
- Styrsiwn, European sea sturgeon, Acipenser sturio
- Pibydd Y Dorlan, Common Sandpiper, Actitis hypoleucos
- Penbwl Môr, Agonus cataphractus, Agonus cataphractus
- Hwyaden Gribog, Mandarin Duck, Aix galericulata
- Gorwyniad, Common bleak, Alburnus alburnus
- Llurs, Razorbill, Alca torda
- Carfil Bach, Little Auk, Alle alle
- Llwynog Môr, Common thresher, Alopias vulpinus
- Herlyn, Allis shad, Alosa alosa
- Gwangen, Twait Shad, Alosa fallax
- Llymrïen, Lesser sand eel, Ammodytes tobianus
- Morflaidd Brith Danheddog, Northern wolffish, Anarhichas denticulatus
- Morflaidd, Atlantic wolffish, Anarhichas lupus
- Morflaidd Brith, Spotted wolffish, Anarhichas minor
- Hwyaden Lostfain, Northern Pintail, Anas acuta
- Corhwyaden, Eurasian Teal, Anas crecca
- Corhwyaden Asgell-Werdd, Green-winged Teal, Anas crecca carolinensis
- Corhwyaden Asgell-Las, Blue-winged Teal, Anas discors
- Chwiwell, Eurasian Wigeon, Anas penelope
- Hwyaden Wyllt, Mallard, Anas platyrhynchos
- Hwyaden Addfain, Garganey, Anas querquedula
- Hwyaden Ddu, American Black Duck, Anas rubripes
- Hwyaden Lwyd, Gadwall, Anas strepera
- Llysywen, European eel, Anguilla anguilla
- Gŵydd Dalcen-Wen, Greater White-fronted Goose, Anser albifrons
- Gŵydd Wyllt, Greylag Goose, Anser anser
- Gŵydd Troetbinc, Pink-footed Goose, Anser brachyrhynchus
- Gŵydd Dalcen-Wen Leiaf, Lesser White-fronted Goose, Anser erythropus
- Gŵydd Y Llafur, Bean Goose, Anser fabalis
- Gobi Tryloyw, Transparent goby, Aphia minuta
- Cwtiad Y Traeth, Ruddy Turnstone, Arenaria interpres
- Pysgodyn Arian Mawr, Greater argentine, Argentina silus
- Pysgodyn Arian Bach, argentine, Argentina sphyraena
- Drymiwr, Argyrosomus regius, Argyrosomus regius
- Lleden Thor, Thor's scaldfish, Arnoglossus thori
- Ysgyfarnog Fôr, Red gurnard, Aspitrigla cuculus
- Pysgodyn Ystlys-Arian Cennog, Big-scale sand smelt, Atherina boyeri
- Pysgodyn Ystlys-Arian, Sand smelt, Atherina presbyter
- Macrell Roche, Bullet tuna, Auxis rochei
- Hwyaden Dorchog, Ring-necked Duck, Aythya collaris
- Hwyaden Bengoch, Common Pochard, Aythya ferina
- Hwyaden Gopog, Tufted Duck, Aythya fuligula
- Hwyaden Benddu, Greater Scaup, Aythya marila
- Morfil Pigfain, Common minke whale, Balaenoptera acutorostrata
- Morfil Asgellog Sei, Sei whale, Balaenoptera borealis
- Morfil Asgellog Glas, Blue whale, Balaenoptera musculus
- Morfil Asgellog Llwyd, Fin whale, Balaenoptera physalus
- Pysgodyn Clicied, Grey triggerfish, Balistes carolinensis
- Cornbig, Garfish, Belone belone
- Llyfrothen Adeiniog, Butterfly blenny, Blennius ocellaris
- Merfog Gwyn, Silver Bream, Blicca bjoerkna
- Pysgodyn Llygad-Llo, Boops boops, Boops boops
- Penfras Y Gogledd, Boreogadus saida, Boreogadus saida
- Merfog Môr, Atlantic pomfret, Brama brama
- Gŵydd Ddu, Brant Goose, Branta bernicla
- Gŵydd Canada, Canada Goose, Branta canadensis
- Gŵydd Wyran, Barnacle Goose, Branta leucopsis
- Gŵydd Frongoch, Red-breasted Goose, Branta ruficollis
- Torsg, Cusk (fish), Brosme brosme
- Hwyaden Lygad-Aur, Common Goldeneye, Bucephala clangula
- Lleden Felen Fach, Solenette, Buglossidium luteum
- Pedryn Bulwer, Bulwer's Petrel, Bulweria bulwerii
- Rhedwr Y Moelydd, Eurasian Stone-curlew, Burhinus oedicnemus
- Pibydd Y Tywod, Sanderling, Calidris alba
- Pibydd Y Mawn, Dunlin, Calidris alpina
- Pibydd Baird, Baird's Sandpiper, Calidris bairdii
- Pibydd Yr Aber, Red Knot, Calidris canutus
- Pibydd Cambig, Curlew Sandpiper, Calidris ferruginea
- Pibydd Tinwyn, white-rumped sandpiper, Calidris fusicollis
- Pibydd Du, Purple Sandpiper, Calidris maritima
- Pibydd Cain, Pectoral Sandpiper, Calidris melanotos
- Pibydd Bach, Little Stint, Calidris minuta
- Pibydd Llwyd, Semipalmated Sandpiper, Calidris pusilla
- Pibydd Temminck, Temminck's Stint, Calidris temminckii
- Bwgan Dŵr, Common dragonet, Callionymus lyra
- Bwgan Brith, Spotted dragonet, Callionymus maculatus
- Crwban Môr Pendew, Loggerhead sea turtle, Caretta caretta
- Pysgodyn Du, Rudderfish, Centrolophus niger
- Gwylog Ddu, Black Guillemot, Cepphus grylle
- Heulgi, Basking shark, Cetorhinus maximus
- Cwtiad Caint, Kentish Plover, Charadrius alexandrinus
- Cwtiad Torchog Bach, Little Ringed Plover, Charadrius dubius
- Cwtiad Torchog, Common Ringed Plover, Charadrius hiaticula
- Cwtiad Y Tywod Mwyaf, Greater Sand Plover, Charadrius leschenaultii
- Cwtiad Torchog Mawr, Killdeer, Charadrius vociferus
- Hyrddyn Llwyd Gweflog, Thicklip grey mullet, Chelon labrosus
- Crwban Môr Gwyrdd, Green sea turtle, Chelonia mydas
- Cwningen Fôr, Rabbit fish, Chimaera monstrosa
- Cors-Wennol Farfog, Whiskered Tern, Chlidonias hybrida
- Cors-Wennol Adeinwen, White-winged Tern, Chlidonias leucopterus
- Cors-Wennol Ddu, Black Tern, Chlidonias niger
- Brithyll Mair Pum-Barf, Fivebeard rockling, Ciliata mustela
- Hwyaden Gynffon-Hir, Long-tailed Duck, Clangula hyemalis
- Pennog (Neu Ysgadenyn), Atlantic herring, Clupea harengus
- Congren (Neu Llysywen Fôr), European conger, Conger conger
- Fendas, Coregonus albula, Coregonus albula
- Polan, Arctic cisco, Coregonus autumnalis
- Powan, Coregonus lavaretus, Coregonus lavaretus
- Howtin, Houting, Coregonus oxyrinchus
- Gwrachen Seithliw, Mediterranean rainbow wrasse, Coris julis
- Cynffon Llygoden, Coryphaenoides rupestris, Coryphaenoides rupestris
- Llyfrothen Montagu, Montagu's blenny, Coryphoblennius galerita
- Penlletwad, European bullhead, Cottus gobio
- Gwrachen Baillon, , Crenilabrus bailloni
- Gwrachen Eurben, Corkwing wrasse, Crenilabrus melops
- Rhegen Yr Ŷd, Corn Crake, Crex crex
- Gobi Gwydraidd, Crystal goby, Crystallogobius linearis
- Gwrachen Fair, Goldsinny wrasse, Ctenolabrus rupestris
- Rhedwr Y Twyni, Cream-coloured Courser, Cursorius cursor
- Iâr Fôr, Cyclopterus lumpus, Cyclopterus lumpus
- Alarch Y Gogledd, Whooper Swan, Cygnus cygnus
- Alarch Dof, Mute Swan, Cygnus olor
- Cerpyn, Common carp, Cyprinus carpio
- Morlo Cycyllog, Hooded seal, Cystophora cristata
- Morgath Ddu, Common stingray, Dasyatis pastinaca
- Morfil Gwyn, Beluga whale, Delphinapterus leucas
- Dolffin Cyffredin, Short-beaked common dolphin, Delphinus delphis
- Merfog Ysgithrog, Common dentex, Dentex dentex
- Crwban Môr Cefn-Lledr, Leatherback sea turtle, Dermochelys coriacea
- Draenogyn Mor, European seabass, Dicentrarchus labrax
- Albatros Aelddu, Black-browed Albatross, Diomedea melanophris
- Môr-Wiber Fach, Lesser weever, Echiichthys vipera
- Crëyr Bach, Little Egret, Egretta garzetta
- Brithyll Mair Pedair-Barf, Fourbeard rockling, Enchelyopus cimbrius
- Brwyniad, European anchovy, Engraulis encrasicolus
- Crwban Môr Gwalchbig, Hawksbill sea turtle, Eretmochelys imbricata
- Morlo Barfog, Bearded seal, Erignathus barbatus
- Penhwyad, Northern pike, Esox lucius
- Morgi Seithliw, Velvet belly lanternshark, Etmopterus spinax
- Tiwna Bach, Little tunny, Euthynnus alletteratus
- Marlin, Skipjack tuna, Euthynnus pelamis
- Chwyrnwr Llwyd, Grey gurnard, Eutrigla gurnardus
- Pal, Atlantic Puffin, Fratercula arctica
- Aderyn Drycin Y Graig, Northern Fulmar, Fulmarus glacialis
- Swtan Arian, Silvery pout, Gadiculus argenteus
- Penfras (Neu Codyn), Atlantic cod, Gadus morhua
- Penfras Yr Ynys Las, Greenland cod, Gadus ogac
- Brithyll Mair Tair-Barf, Three-bearded rockling, Gaidropsarus vulgaris
- Ci Glas, School shark, Galeorhinus galeus
- Morgi Cegddu, Blackmouth catshark, Galeus melastomus
- Gïach Mawr, Great Snipe, Gallinago media
- Crothell Dri Phigyn, Three-spined stickleback, Gasterosteus aculeatus
- Trochydd Pigwyn, Yellow-billed Loon, Gavia adamsii
- Trochydd Gyddfddu, Black-throated Loon, Gavia arctica
- Trochydd Mawr, Great Northern Loon, Gavia immer
- Trochydd Gyddfgoch, Red-throated Loon, Gavia stellata
- Môr-Wennol Ylfinbraff, Gull-billed Tern, Gelochelidon nilotica
- Cwtiad-Wennol Adain-Ddu, Black-winged Pratincole, Glareola nordmanni
- Cwtiad-Wennol Dorchog, Collared Pratincole, Glareola pratincola
- Morfil Pengrwn, Long-finned pilot whale, Globicephala melas
- Lleden Wrach, Witch (righteye flounder), Glyptocephalus cynoglossus
- Llyfrothen Dŵr Croyw, Gobio gobio, Gobio gobio
- Gobi Mawr, Giant goby, Gobius cobitis
- Gobi Couch, Couch's goby, Gobius couchi
- Gobi Mingoch, Red-mouthed goby, Gobius cruentatus
- Gobi Du, Black goby, Gobius niger
- Bill Bigog, Rock goby, Gobius paganellus
- Dolffin Risso, Risso's dolphin, Grampus griseus
- Crychyn, Ruffe, Gymnocephalus cernuus
- Pioden Fôr, Eurasian Oystercatcher, Haematopus ostralegus
- Eryr Môr, White-tailed Eagle, Haliaeetus albicilla
- Eryr Moel, Bald Eagle, Haliaeetus leucocephalus
- Morlo Llwyd, Grey seal, Halichoerus grypus
- Hirgoes, Black-winged Stilt, Himantopus himantopus
- Lleden Ffrengig, Atlantic halibut, Hippoglossus hippoglossus
- Pedryn Drycin, European Storm Petrel, Hydrobates pelagicus
- Morfil Trwyn Potel, Northern bottlenose whale, Hyperoodon ampullatus
- Sgorpion Môr Deugorn, Twohorn sculpin, Icelus bicornis
- Pysgodyn Hwyliog, Indo-Pacific sailfish, Istiophorus platypterus
- Morfil Sberm Lleiaf, Pygmy sperm whale, Kogia breviceps
- Cleiriach Y Gwymon, Ballan wrasse, Labrus bergylta
- Gwrachen Resog, Cuckoo wrasse, Labrus mixtus
- Dolffin Ystlyswyn, Atlantic white-sided dolphin, Lagenorhynchus acutus
- Dolffin Pigwyn, White-beaked dolphin, Lagenorhynchus albirostris
- Corgi Môr, Porbeagle, Lamna nasus
- Llysywen Bendoll Yr Afon, European river lamprey, Lampetra fluviatilis
- Gwylan Y Penwaig, European Herring Gull, Larus argentatus
- Gwylan Chwerthinog, Laughing Gull, Larus atricilla
- Gwylan Y Gweunydd, Common Gull, Larus canus
- Gwylan Fodrwybig, Ring-billed Gull, Larus delawarensis
- Gwylan Gefnddu Leiaf, Lesser Black-backed Gull, Larus fuscus
- Gwylan Yr Arctig, Iceland Gull, Larus glaucoides
- Gwylan Y Gogledd, Glaucous Gull, Larus hyperboreus
- Gwylan Môr Y Canoldir, Mediterranean Gull, Larus melanocephalus
- Gwylan Fechan, Little Gull, Larus minutus
- Gwylan Bonaparte, Bonaparte's Gull, Larus philadelphia
- Gwylan Franklin, Franklin's Gull, Larus pipixcan
- Gwylan Benddu, Black-headed Gull, Larus ridibundus
- Gwylan Sabine, Sabine's Gull, Larus sabini
- Lleden Fair Bedwar-Smotyn, Lepidorhombus boscii, Lepidorhombus boscii
- Gobi Fries, Fries's goby, Lesuerigobius friesii
- Twb Y Dail, European chub, Leuciscus cephalus
- Orff, Ide (fish), Leuciscus idus
- Darsen, Common dace, Leuciscus leuciscus
- Lleden Dywod, Common dab, Limanda limanda
- Pibydd Llydanbig, Broad-billed Sandpiper, Limicola falcinellus
- Gïach Gylfin-Hir, Long-billed Dowitcher, Limnodromus scolopaceus
- Rhostog Gynffonfraith, Bar-tailed Godwit, Limosa lapponica
- Iâr Fôr Lysnafeddog, Common seasnail, Liparis liparis
- Llyfrothen Benddu, Lipophrys pholis, Lipophrys pholis
- Hyrddyn Aur, Golden grey mullet, Liza aurata
- Hyrddyn Llwyd Minfain, Thinlip mullet, Liza ramada
- Cythraul Y Môr, Lophius piscatorius, Lophius piscatorius
- Penfras Dŵr Croyw, Burbot, Lota lota
- Llyfrothen Fain, snake blenny, Lumpenus lampretaeformis
- Dyfrgi, European otter, Lutra lutra
- Gïach Bach, Jack Snipe, Lymnocryptes minimus
- Caplan, Capelin, Mallotus villosus
- Morfil Cefngrwm, Humpback whale, Megaptera novaeangliae
- Môr-Hwyaden Y Gogledd, Velvet Scoter, Melanitta fusca
- Mor-Hwyaden Ddu, Common Scoter, Melanitta nigra
- Môr-Hwyaden Yr Ewyn, Surf Scoter, Melanitta perspicillata
- Hadog, Haddock, Melanogrammus aeglefinus
- Lleian Wen, Smew, Mergus albellus
- Hwyaden Ddanheddog, Common Merganser, Mergus merganser
- Hwyaden Frongoch, Red-breasted Merganser, Mergus serrator
- Gwyniad Môr, Merlangius, Merlangius merlangus
- Cegddu, Merluccius merluccius, Merluccius merluccius
- Morfil Gylfinog Sowerby, Sowerby's beaked whale, Mesoplodon bidens
- Morfil Gylfinog True, True's beaked whale, Mesoplodon mirus
- Swtan Glas, Blue whiting, Micromesistius poutassou
- Lleden Lefn, Lemon sole, Microstomus kitt
- Pysgodyn Haul, Ocean sunfish, Mola mola
- Honos Glas, Blue ling, Molva dypterygia
- Honos, Common ling, Molva molva
- Morfil Uncorn, Narwhal, Monodon monoceros
- Mingrwn, Striped red mullet, Mullus surmuletus
- Morgi Llyfn, Starry smooth-hound, Mustelus asterias
- Morgi Serennog, Common smooth-hound, Mustelus mustelus
- Sgorpion Môr Pedwar-Corn, Fourhorn sculpin, Myoxocephalus quadricornis
- Safngrwn, Myxine glutinosa, Myxine glutinosa
- Pibell Fôr Leiaf, Worm pipefish, Nerophis lumbriciformis
- Pibell Fôr Drwynsyth, Straightnose pipefish, Nerophis ophidion
- Hwyaden Gribgoch, Red-crested Pochard, Netta rufina
- Gylfinir, Eurasian Curlew, Numenius arquata
- Coegylfinir Bach, Little Curlew, Numenius minutus
- Coegylfinir, Whimbrel, Numenius phaeopus
- Pedryn Wilson, Wilson's Storm Petrel, Oceanites oceanicus
- Pedryn Cynffon-Fforchog, Leach's Storm Petrel, Oceanodroma leucorhoa
- Morlo Ysgithrog, Walrus, Odobenus rosmarus
- Eog Cefngrwm, Pink salmon, Oncorhynchus gorbuscha
- Lleiddiad, Killer whale, Orcinus orca
- Bonito Unlliw, Orcynopsis unicolor, Orcynopsis unicolor
- Brwyniad Conwy, European smelt, Osmerus eperlanus
- Hwyaden Goch, Ruddy Duck, Oxyura jamaicensis
- Hwyaden Benwen, White-headed Duck, Oxyura leucocephala
- Merfog Coch, Blackspot seabream, Pagellus bogaraveo
- Pandora, Common pandora, Pagellus erythrinus
- Gwylan Ifori, Ivory Gull, Pagophila eburnea
- Twmpot, Tompot blenny, Parablennius gattorugine
- Lleden Wadn Y Tywod, Sand sole, Pegusa lascaris
- Morfil Pen Pwmpen, Melon-headed whale, Peponocephala electra
- "Draenogyn Dŵr Croyw(G), draenogiaid dŵr croyw", European perch
- Llysywen Bendoll Y Môr, Sea lamprey, Petromyzon marinus
- Mulfran Werdd, European Shag, Phalacrocorax aristotelis
- Mulfran, Great Cormorant, Phalacrocorax carbo
- Llydandroed Llwyd, Red Phalarope, Phalaropus fulicarius
- Llydandroed Gyddfgoch, Red-necked Phalarope, Phalaropus lobatus
- Llydandroed Wilson, Wilson's Phalarope, Phalaropus tricolor
- Pibydd Torchog, Ruff, Philomachus pugnax
- Morlo Cylchog, Ringed seal, Phoca hispida
- Morlo Cyffredin, Harbor seal, Phoca vitulina
- Llamhidydd, Harbour porpoise, Phocoena phocoena
- Llyfrothen, Rock gunnel, Pholis gunnellus
- Pilcodyn, Common minnow, Phoxinus phoxinus
- Lleden Benglwm Norwy, Norwegian topknot, Phrynorhombus norvegicus
- Lleden Benglwm Eckstrom, , Phrynorhombus regius
- Morfil Sberm, Sperm whale, Physeter macrocephalus
- Lleden Fwd, European flounder, Platichthys flesus
- Crymanbig Ddu, Glossy Ibis, Plegadis falcinellus
- Lleden Goch, European plaice, Pleuronectes platessa
- Cwtiad Aur, European Golden Plover, Pluvialis apricaria
- Corgwtiad Aur, American Golden Plover, Pluvialis dominica
- Cwtiad Llwyd, Grey Plover, Pluvialis squatarola
- Gwyach Gorniog, Horned Grebe, Podiceps auritus
- Gwyach Fawr Gopog, Great Crested Grebe, Podiceps cristatus
- Gwyach Yddfgoch, Red-necked Grebe, Podiceps grisegena
- Gwyach Yddfddu, Black-necked Grebe, Podiceps nigricollis
- Gwyach Ylfinfraith, Pied-billed Grebe, Podilymbus podiceps
- Morlas, Pollachius pollachius, Pollachius pollachius
- Chwitlyn Glas, Pollachius virens, Pollachius virens
- Pysgodyn Broc Môr, Atlantic wreckfish, Polyprion americanus
- Gobi, Common goby, Pomatoschistus microps
- Gobi'R Tywod, Sand goby, Pomatoschistus minutus
- Gobi Norwy, Norway goby, Pomatoschistus norvegicus
- Gobi Lliwgar, Painted goby, Pomatoschistus pictus
- Rhegen Fraith, Spotted Crake, Porzana porzana
- Rhegen Baillon, Baillon's Crake, Porzana pusilla
- Morgi Glas, Blue shark, Prionace glauca
- Coegleiddiad, False killer whale, Pseudorca crassidens
- Merfog Arian, silver pomfret, Pterycombus brama
- Aderyn Drycin Bach, Little Shearwater, Puffinus assimilis
- Aderyn Drycin Mawr, Great Shearwater, Puffinus gravis
- Aderyn Drycin Manaw, Manx Shearwater, Puffinus puffinus
- Crothell Naw Pigyn, Ninespine stickleback, Pungitius pungitius
- Morgath Wen, white skate, Raja alba
- Morgath (Neu Cath Fôr), Common skate, Raja batis
- Morgath Drwynbwl, cownose ray, Raja bonasus
- Morgath Styds, Thornback ray, Raja clavata
- Morgath Gribog, shagreen ray, Raja fullonica
- Morgath Lygaid-Bach, Smalleyed ray, Raja microocellata
- Morgath Bigog, Thorny skate, Raja radiata
- Morgath Donnog, Undulate ray, Raja undulata
- Rhegen Ddŵr, Water Rail, Rallus aquaticus
- Penbwl Môr, Raniceps raninus, Raniceps raninus
- Pysgodyn Haul Main, Slender sunfish, Ranzania laevis
- Cambig, Pied Avocet, Recurvirostra avosetta
- Lleden Yr Ynys Las, Greenland halibut, Reinhardtius hippoglossoides
- Gwylan Ross, Ross's Gull, Rhodostethia rosea
- Gwylan Goesddu, Black-legged Kittiwake, Rissa tridactyla
- Rhufell, Common roach, Rutilus rutilus
- Brithyll Seithliw, Rainbow trout, Salmo gairdneri
- Brithyll Seithliw, Rainbow trout, Salmo gairdneri
- Eog, Atlantic salmon, Salmo salar
- Brithyll, Brown trout, Salmo trutta
- Siwin (Neu Gwyniedyn), Brown trout, Salmo trutta
- Torgoch Afon, Brook trout, Salvelinus fontinalis
- Bonito, Atlantic bonito, Sarda sarda
- Pennog Mair, European pilchard, Sardina pilchardus
- Salpa, Salema porgy, Sarpa salpa
- Pysgodyn Rhudd, Common rudd, Scardinius erythrophthalmus
- Macrell Sbaen, Chub mackerel, Scomber japonicus
- Macrell, Atlantic mackerel, Scomber scombrus
- Sgipiwr, Atlantic saury, Scomberesox saurus
- Torbwt, Turbot, Scophthalmus maximus
- Lleden Fannog, Brill (fish), Scophthalmus rhombus
- Pysgodyn Safnlas, Scorpaenidae, Scorpaenidae
- Morgi, Small-spotted catshark, Scyliorhinus canicula
- Morgi Brych, Nursehound, Scyliorhinus stellaris
- Pysgodyn Coch, Rose fish, Sebastes marinus
- Pysgodyn Coch Norwy, Norway haddock, Sebastes viviparus
- Pencath, Wels catfish, Silurus glanis
- Lleden Chwithig, Common sole, Solea solea
- Hwyaden Fwythblu, Common Eider, Somateria mollissima
- Hwyaden Fwythblu'R Gogledd, King Eider, Somateria spectabilis
- Morgi'R Ynys Las, Greenland shark, Somniosus microcephalus
- Morgi Pen Morthwyl, Smooth hammerhead, Sphyrna zygaena
- Crothell Bymtheg-Pigyn, Spinachia spinachia, Spinachia spinachia
- Merfog Du, Black seabream, Spondyliosoma cantharus
- Corbennog, European sprat, Sprattus sprattus
- Ci Pigog, Spiny dogfish, Squalus acanthias
- Maelgi, Squatina squatina, Squatina squatina
- Dolffin Rhesog, striped dolphin, Stenella caeruleoalba
- Sgiwen Lostfain, Long-tailed Jaeger, Stercorarius longicaudus
- Sgiwen Pegwn Y De, South Polar Skua, Stercorarius maccormicki
- Sgiwen Y Gogledd, Parasitic Jaeger, Stercorarius parasiticus
- Sgiwen Fach, Pomarine Skua, Stercorarius pomarinus
- Sgiwen Fawr, Great Skua, Stercorarius skua
- Môr-Wennol Fechan, Little Tern, Sterna albifrons
- Môr-Wennol Ffrwynog, Bridled Tern, Sterna anaethetus
- Môr-Wennol Gribog Leiaf, Lesser Crested Tern, Sterna bengalensis
- Môr-Wennol Fwyaf, Caspian Tern, Sterna caspia
- Môr-Wennol Wridog, Roseate Tern, Sterna dougallii
- Môr-Wennol Forster, Forster's Tern, Sterna forsteri
- Môr-Wennol Fraith, Sooty Tern, Sterna fuscata
- Môr-Wennol Gyffredin, Common Tern, Sterna hirundo
- Môr-Wennol Fawr, Royal Tern, Sterna maxima
- Môr-Wennol Y Gogledd, Arctic Tern, Sterna paradisaea
- Môr-Wennol Bigddu, Sandwich Tern, Sterna sandvicensis
- Draenogyn Cegfawr, Zander, Stizostedion lucioperca
- Hugan, Northern Gannet, Sula bassana
- Pibell Fôr Nilsson, Lesser pipefish, Syngnathus rostellatus
- Pibell Fôr Drwynllydan, Broadnosed pipefish, Syngnathus typhle
- Gwyach Fach, Little Grebe, Tachybaptus ruficollis
- Hwyaden Goch Yr Eithin, Ruddy Shelduck, Tadorna ferruginea
- Hwyaden Yr Eithin, Common Shelduck, Tadorna tadorna
- Merfog Asgell-Hir, Big-scale pomfret, Taractichthys longipinnis
- Sgorpion Môr, Taurulus bubalis, Taurulus bubalis
- Sgorpion Môr Norwy, Norway bullhead, Taurulus lilljeborgi
- Gobi Mannog, Leopard-spotted goby, Thorogobius ephippiatus
- Tiwna Asgell-Hir, Albacore, Thunnus alalunga
- Tiwna Melyn, Yellowfin tuna, Thunnus albacares
- Tiwna, Atlantic bluefin tuna, Thunnus thynnus
- Cangen Las, Grayling (species), Thymallus thymallus
- Sgreten, Tench, Tinca tinca
- Morgath Drydan Fraith, Marbled electric ray, Torpedo marmorata
- Morgath Drydan, Atlantic torpedo, Torpedo nobiliana
- Môr-Wiber Fawr, Greater weever, Trachinus draco
- Marchfacrell, Atlantic horse mackerel, Trachurus trachurus
- Chwyrnwr Ysgithrog, Piper gurnard, Trigla lyra
- Chwyrnwr Rhesog, Streaked gurnard, Trigloporus lastoviza
- Pibydd Cynffonlwyd, Grey-tailed Tattler, Tringa brevipes
- Pibydd Coesgoch Mannog, Spotted Redshank, Tringa erythropus
- Melyngoes Bach, Lesser Yellowlegs, Tringa flavipes
- Melyngoes Mawr, Greater Yellowlegs, Tringa melanoleuca
- Pibydd Coeswyrdd, Common Greenshank, Tringa nebularia
- Pibydd Y Gors, Marsh Sandpiper, Tringa stagnatilis
- Pibydd Coesgoch, Common Redshank, Tringa totanus
- Swtan Norwy, Trisopterus esmarkii, Trisopterus esmarkii
- Codyn Llwyd, Trisopterus luscus, Trisopterus luscus
- Codyn Ebrill, Poor cod, Trisopterus minutus
- Dolffin Trwyn Potel, Common bottlenose dolphin, Tursiops truncatus
- Gwylog, Common Murre, Uria aalge
- Cwtiad Heidiol, Sociable Lapwing, Vanellus gregarius
- Pysgodyn Cleddyf, Swordfish, Xiphias gladius
- Pysgodyn Darn Arian, John Dory, Zeus faber
- Morfil Gylfinog Cuvier, Cuvier's beaked whale, Ziphius cavirostris
- Gweflogyn, Viviparous eelpout, Zoarces viviparus
