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