Fragile Brittlestar (Ophiothrix fragilis), detail of two individuals moving over sandy 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 two animals arms arm gravel sea bottom seabed st abbs scotland uk united kingdom close up close ups close up close ups echinoderms north sea moving move portrait vertical sealife sea life