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Distribution in scandinavian waters
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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.
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