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This hydroid is similar to Diphasia species in having the hydrothecae arranged in opposite pairs on the main stem and side branches of the sparsely branched, pinnate colonies. The hydrothecae are tubular in shape, large and robust and are attached for approximately 1/2 of their length, the upper 1/2 being unattached with a three pointed outer margin. Colonies are typically about 60mm to a maximum of 150mm in overall height. This species could easily be mistaken for a sparsely branched form of Abietinaria abietina but is distinguished by its opposite hydrothecae. The other species to compare are the various Diphasia species.


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© National Museums Northern Ireland and its licensors

Source: Encyclopedia of Marine Life of Britain and Ireland

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