Worms & their Eggs on Worms Head Causeway

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Slimey green blob on the beach with seaweed.

Their were small green slime balls everywhere on the Worms Head Causeway last week. They were attached to seaweeds, rocks, and shells, either exposed to the air or in shallow tide pools. We thought at first they were the eggs of the marine polychaete paddle worm commonly called the Green Leaf Worm (Eulalia viridis (Linnaeus) – but we didn’t see any adults of that species in the locality.

We did find lots of specimens of a related species which I believe to be Phyllodoce (Anaitides) maculata (Linnaeus). These worms were slithering over mussel shells and wriggling over rocks in pools. Their appearance was most distinct. I couldn’t take any underwater close-ups but the images I captured are just about good enough to zoom in to see the characteristic appearance and patterning. I did not take any specimens to view under the microscope to confirm the identification by looking at details such as the proboscis, tentacles, and paddles. Maybe I should take specimen tubes with me and do that another time.

Unlike the bright green Eulalia viridis, the worm P. maculata is not green in colour but is described as whitish or yellowish with transverse dark brown bands. It can, however, produce green eggs as well as dark orange ones.


Hayward P. J. and Ryland J. S (1998) Handbook of the Marine Fauna of Northwest Europe, Oxford University Press, pp 215 223.

Blob of green jelly attached to mussel shells in a tide pool and containing worm eggs on the seashore.

Small green slime ball containing paddle worm eggs on the seashore.

Snot-like green ball of mucilage containing microscopic green aggs of a marine paddle worm.

small jelly-like green ball covered with mucus and detritus and containing green worm eggs.

Lots of stripey marine worms slithering among mussel shells in a tide pool.

Marine polychaete paddle worms living amongst mussels in a rock pool.

Paddle worm crawling over a rock in a tide pool.

Detail of a marine paddle worm crawling over a rock in a tide pool.


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