Fragile Brittlestar (Ophiothrix fragilis), detail of many individuals with arms raised on gravel seabed, St Abbs, Scotland, UK North Sea

underwater fragile brittlestar brittle starfish brittle star fish brittle starfishes brittle star fishes ophiothrix fragilis fragile fragile brittle starfish fragile brittle star fish large group of animals arms arm gravel sea bottom seabed st abbs scotland uk united kingdom close up close ups close up close ups echinoderms north sea black sealife sea life full frame crowded togetherness