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Description

This hydroid is found as clusters of pinnate colonies with the main stem usually slightly curved and with alternately arranged side branches. The hydrothecae are long and tubular and are arranged in opposite pairs. They are attached to the side branches for approximately 1/2 of their length. There is a single opercular flap attached to the inner margin. The gonothecae are relatively large and are arranged on short pedicels. The male capsule is elongate, and tapers towards the base. There are four thick spines that surround the males raised aperture. The female gonotheca is more ovate in shape and four long, leaf-like processes surround the aperture. Typically individual fronds are 40mm in length.

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Source: Encyclopedia of Marine Life of Britain and Ireland

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