Fig. 4.

In situ images of B. hirsutum from the Reykjanes Ridge axis (A–D) and the IceAGE vent field (E, F). A, Dense cluster of specimens attached to pillow lava (site B). B, Barnacles aggregated with a cold-water coral. Accumulated dead shell plates visible to the lower left (site C). C, Epizoic growth on boulder with associated coral fauna (site C). D, Feeding behaviour by extended cirral fans in multiple specimens situated on volcanic rock (site C). E–F, Specimens with brown-black shell precipitate attached to volcanic rocks, surrounded by white bacterial mats (site D). Large orange anemones, possibly of the genus Phelliactis, share the habitat. Image courtesy: GEOMAR, Kiel.