Sea cucumbers (Synaptula sp.) on giant barrel sponge (Xestospongia testudinaria), Dumaguete, Negros Island, Philippines, Southeast Asia, Asia

invertebrates echinoderms sea cucumbers synaptula sp giant barrel sponge xestospongia testudinaria dumaguete negros island philippines coral reef day outdoors nature natural world marine life close up close ups sea cucumber sponge sponges barrel sponge barrel sponges southeast asia asia shapes synaptula coral reefs horizontal