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A feather-like hydroid with central main stem and numerous side branches arising in a flat plane. The main stem is brown in colour. The side branches are composed of separate joints, one joint bearing a hydrotheca and defensive nematothecae alternates with a shorter joint bearing only nematophores. The gonothecae are amphora-shaped, with an oval body and tubular neck, borne along the central region of the colony. This species seems to come in two forms, when growing on other hydroids it measures only about 15mm in height, while on rocky substrata it grows to 70mm or more in length. This species is similar to Kirchenpaueria similis but can be distinguished by its amphora-shaped gonothecae and brown as opposed to colourless main stem.


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© National Museums Northern Ireland and its licensors

Source: Encyclopedia of Marine Life of Britain and Ireland

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