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Dyma fôr-wlithen resog â phen bach. Mae i'w gweld yma ar wely'r môr lle ceir amrywiaeth o greaduriaid cytrefol ac ambell wymon coch. Caiff celloedd llosgol ei phrae eu storio yn y pigau ar ei chefn. Mae'n defnyddio'r rhain i'w hamddiffyn ei hun. Ffilmiwyd gan Phil Newman yng Ngwarchodfa Natur Forol Ynys Sgomer.

The "small-headed, lined" sea slug according to its scientific name. Seen here on the typical seabed "turf" composed mainly of a variety of colonial animals and some red seaweed. Stinging cells from the food of this slug are stored in the finger-like cerata on its back to provide a defence. Filmed by Phil Newman at Skomer MNR.

Check out the post on our English langauge blog 'The Welsh View' - http://thewelshview.co.uk/skomers-sub... - and find out a little more about these beautiful Welsh marine invertebrates with Phil Newman of Skomer Marine Reserve.