anemone capture cnidocyte coruna defense disk flower ocean oral pedal poison polyp portiño predatory prey rock rocks saavem sea tentacle tentacles toxin toxins water texture appearance arms bilaterally symmetric calamari cephalopod fried octopus tentacles invertebrates moist mollusc mottled octopoda octopus seafood skin Slime spots suckers suction cups surface textures wet background wallpaper abstract object crystal green light crystal picture and digital yellow ocher alive animal animals aquarium aquariums beautiful blue blue background creature creatures danger dangerous fish fishmonk jelly jelly fish jellyfish live oceans poisonous pretty soft swim swimming translucent transparent under sea undersea wild hand marina marine pins star stella tentacoli