Dynamena pumila

Distribution in scandinavian waters

Maximum length: 5 cm.
Appearance: In this sparsely branched colony, the individuals are attached in pairs. In natural size it looks as though the stem is composed of small triangles piled on top of each other. Usually dark brown in colour, but when the light shines through the chitin casing the colour can change to a golden lustre. The picture above depicts a colony of dynamena pumila that has been coloured by red algae. Dynamena pumila is self-luminescent.
    Because this species has a very characteristic appearance, it is easily recognizable. Compare with other hydroids, such as the club-headed hydroid.
Depth: From sea-level and a few metres down.
Environment: This hydroid attaches itself readily to the older parts of brown algae. The picture above depicts a colony attached to toothed wrack.
Misc: Dynamena pumila catches minute plankton particles with its tentacles. The hydroid itself can be assaulted by among other things, opisthobranchs and sea-spiders..
Classification: Dynamena pumila belongs to the group hydroids under the cnidarians.

Sea-fir    Other names

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