Club-headed hydroid

Distribution in scandinavian waters

Maximum length: 1,5 cm.
Appearance: The individuals (polyps) have a pink to light red colour and swollen tops. The polyps are furnished with white tentacles at least half way down. Because of the characteristic place of growth, their sizable polyps, redness, and the blue coloured eggs, the club-headed hydroid is easily recognized. Compare with a few other hydroids, for example the hydroid dynamena pumila.
Depth: From sea-level and a few metres down.
Environment: This hydroid is usually found between branches and in depressions on shallow water brown algae. The picture above depicts a hydroid attached to a knotted wrack.
Misc: The club-headed hydroid catches minute plankton particles with its tentacles. The hydroid itself can be assaulted by among other things, opisthobranchs and sea-spiders.
Classification: Club-headed hydroids are part of the hydroid group under the cnidarians.

Club-headed hydroid    Other names

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Bo Johannesson | Martin Larsvik | Lars-Ove Loo | Helena Samuelsson