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This hydroid is most likely to be mistaken for Abietinaria abietina but is much smaller in all its parts. The main stem is unbranched or sparsely branched, with regularly spaced, alternate side branches in a flat plane. The hydrothecae are subalternate on both the stem and side branches. Typical colonies measure about 30mm in height, but can become elongate and branched to 100mm. Most likely to be confused with small colonies of Sertularia argentea which have not started to branch in three dimensions.


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© National Museums Northern Ireland and its licensors

Source: Encyclopedia of Marine Life of Britain and Ireland

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