Pleurobranch sidegill slug (Berthella martensi), Puerto Galera, Mindoro, Philippines, Southeast Asia, Asia

invertebrates sea slug nudibranch snail pleurobranch sidegill slug berthella martensi puerto galera mindoro philippines yellow soft bodied one animal coral reef day outdoors nature natural world marine life close up close ups sea slugs nudibranches snails pleurobranch sidegill slugs southeast asia asia tropical vibrant colors vibrant colours underwater horizontal