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Gwylan: Pomatoceros triqueter. Tiwblyngyren Drumiog. Keel Worm.
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Gwylan: Sabella pavonina
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Gwylan: Sabella pavonina
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Gwylan: Peunlynghyren - Sabella pavonina, Caernarfon
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Gwylan: Peunlynghyren - Sabella pavonina, Caernarfon
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Gwylan: Sabella pavonina
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Gwylan: Peunlynghyren - Sabella pavonina
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Gwylan: Sabellaria alveolata. Y Llyngyren Ddiliau. Honeycomb Worm.
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Gwylan: Lwgwd - Arenicola marina
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Gwylan: Hediste diversicolor - siani garpiog
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Gwylan: Hediste diversicolor. Siani Garpiog. Ragworm.
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Gwylan: Eulalia viridis. Rhodlwr Gwyrdd. Greenleaf Worm.
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Gwylan: Sthenelais boa. Llyngyren Gennog Nadreddog
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Gwylan: Llynghyren gennog
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Gwylan: Lineus longissimus - carrai`r graean
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Gwylan: Lineus longissimus. Carrai`r Graean. Bootlace Worm.
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Gwylan: Lineus longissimus. Carrai`r graean. Bootlace worm. The longest animal.
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Gwylan: Lineus longissimus. Carrai`r Graean. Bootlace Worm.
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Gwylan: Prostheceraeus vittatus. Llyngyren Resog. Candy Stripe Flatworm.
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Gwylan: Llynghyren ledog (flatworm) Cycloporous sp.
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Gwylan: seiri'r tywod - Lanice conchilega
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Gwylan: tiwblyng(h)yren drumiog - Pomatoceros triqueter (keel worm)
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Gwylan: llyngyr diliau - Sabellaria alveolata, Tresaith
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Gwylan: llyngyr diliau - Sabellaria alveolata, Tresaith
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Gwylan: llyngyr diliau - Sabellaria alveolata, Tresaith
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Gwylan: llyngyr diliau - Sabellaria alveolata, Tresaith
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Gwylan: twmffat y tywod - Pectinaria sp. Dale
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Gwylan: Neanthes (Nereis) virens - Biwmaris
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Gwylan: Nereis virens
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Gwylan: twmffat y tywod - Pectinaria sp. Dinas Dinlle