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This hydroid has erect main stems with side branches at regular alternate intervals. The hydrothecae diverge little from the stem and branches. Typical size of colonies is 120mm in height. The overall appearance of this hydroid is most similar to some Diphasia species, but the hydrothecae in this species are subalternate as opposed to opposite in Diphasia.


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© National Museums Northern Ireland and its licensors

Source: Encyclopedia of Marine Life of Britain and Ireland

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