Gwylan: Lutraria lutraria. Cragen y dyfrgi. Otter shell.
Gwylan: Mactra stultorum. Cragen noe. Trough shell.
Gwylan: Cerastoderma edule. Cocosen. Cockle.
Gwylan: Laevicardium crassum. Cocosen lefn. Smooth cockle.
Gwylan: Anomia ephippium. Wystrysen Gyfrwy. Saddle Oyster.
Gwylan: Aequipecten opercularis. Cwin. Cragen y Frenhines. Quin. Queen Scallop.
Gwylan: cwin - Aequipecten opercularis
Gwylan: Mimachlamys varia. Gylfgragen Amryliw. Variagated Scallop.
Gwylan: Mimachlamys varia.
Gwylan: gylfgragen amryliw - Chlamys varia
Gwylan: Wystrysen. Oyster.
Gwylan: Onchidella celtica. Môr-wlithen Geltaidd. Celtic Sea Slug.
Gwylan: Aeolidia papillosa. Môr-wlithen lwyd. Grey seaslug.
Gwylan: Môr-wlithen lygadog - Archidoris pseudoargus
Gwylan: Archidoris pseudoargus
Gwylan: Archidoris pseudoargus
Gwylan: Archidoris pseudoargus
Gwylan: Archidoris pseudoargus
Gwylan: Doris verrucosa. Warty Doris.
Gwylan: Doris verrucosa
Gwylan: Acanthodoris pilosa. Morwlithen. Sea Slug. Afonwen
Gwylan: Polycera quadrilineata
Gwylan: Polycera quadrilineata
Gwylan: Polycera quadrilineata
Gwylan: Polycera quadrilineata
Gwylan: Polycera quadrilineata
Gwylan: Polycera quadrilineata
Gwylan: Polycera quadrilineata
Gwylan: Polycera quadrilineata
Gwylan: Aplysia punctata ova