Rhestr o enwau gwyddonol, Cymraeg a Saesneg am rywogaethau pysgod cregyn.
A list of scientific, Welsh and English shellfish species names.
| Scientific Name | Cymraeg | English |
| Aequipecten opercularis | Cragen y frenhines | Queen scallop |
| Buccinum undatum | Gwalc | Whelk |
| Callista chione | Cragen galed | Hard clam |
| Cancer pagurus | Cranc bwytadwy | Edible crab |
| Cerastoderma edule | Cocos | Cockle |
| Donax spp. | Cragen donacs | Donax clam |
| Ensis spp. | Môr gyllell | Razor clam |
| Homarus gammarus | Cimwch | Lobster |
| Liocarcinus puber |
Cranc melfed/Cranc llygatgoch/Rhwydywella |
Velvet crab |
| Maia squinado | Cranc heglog | Spider crab |
| Mytilus edulis | Cragen lâs | Mussel |
| Nephrops norvegicus | Cimwch Norwy | Nephrops/Dublin Bay prawn |
| Octopus vulgaris | Octopws | Octopus |
| Palinurus spp. | Siacar goch | Crawfish |
| Parapenaeus longirostris | Perdysen rhosyn dyfnddwr | Deepwater rose shrimp |
| Pecten maximus | Cragen fylchog/Cragen Berffro | Scallop |
| Pharus legumen | Môr-gyllell ffa | Bean solen |
| Ruditapes decussatus | Cragen garped rhigolog | Grooved carpet shell |
| Ruditapes phillipinarum | Cragen fyrwddf | Short necked clam |
| Spisula solidissima | Cragen beistion | Surf clam |
| Venerupis pallustra | Cragen garped | Carpetshell |
| Venus verrucosa | Cragen gylchog | Clam |
| Littorina spp. | Gwichyn | Winkle |
| Modiolus modiolus | Marchfisglen | Horse mussel |
| Sepia officinalis | Ystifflog | Cuttlefish |
| Balanus spp. | Cragen llong/Crach y mộr | Barnacle |
| Draenog y mộr | Sea urchin | |
| Cragen y forwyn | Venus shell | |
| Crangon vulgaris | Perdysen/Sioni naill ochr | Shrimp |
| Nucella lapullus | Cragen foch felen | Dog whelk |
| Leander serratus squilla | Corgimwch(-ychiaid) | Prawn |
| Pandalus montagui | Corgimwch Esop | Aesop prawn |
| Cragen Iago/Fair | Cowrie | |
| Cranc/glas/traeth/gwyrdd | Shore crab | |
| Cranc porslen | Porcelain crab | |
| Cranc melyn/mygydog | Masked crab | |
| Pysgranc(od) | Pea crab | |
| Cranc meudwyol/ymfudol | Hermit crab | |
| Galathea | Cimwch byrdew | Squat lobster |
| Cragen y forwyn belydrog | Banded Venus shell | |
| Cragen y forwyn aur/euraidd | Golden Venus shell | |
| Cragen y forwyn hirgron | Oval Venus shell | |
| Cragen y forwyn lefn | Smooth Venus shell | |
| Cragen y forwyn resog | Stripe Venus shell | |
| Cragen y forwyn ddafadennog/arw | Warty Venus shell |
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