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