Pteraeolidia ianthina nudibranch, grows to 150mm, subtropical Indo-west Pacific waters, Philippines, Southeast Asia, Asia

nudibranch photography colour image colour color image color horizontal outdoors outside underwater no people nobody no one no one day animal themes wild wildlife nature the natural world pteraeolidia ianthina philippines southeast asia asia one animal part of side view undersea animals in the wild sea life invertebrate focus on foreground