• Norwegian: liten sjøgran


Hydroid stage: Looks like a feather with numerous branches defining a plane. Each branch has a separate joint to the main stem. The hydroids grow on both sides of the regularly spaced branches alternating along the stem. The colony may grow to a height of 25 cm. Sometimes it has several stems growing from the fibrous base.

Medusa stage: No information.


It is usually found on depths between 20 and 100 meters, preferably on rocky substrate.


The Herring-bone hydroid is record in the Atlantic Ocean, from Spitzbergen to South-AFrica, as well as from parts of the Pacific Ocean.