Halophila decipiens

About

Halophila decipiens, commonly known as paddle grass, is a seagrass species found in tropical waters of the Atlantic Ocean, Indo-Pacific, and other parts of the world. It has oval-shaped leaves and grows in short patches on the seafloor that contain extensive root systems underneath. Although its distribution is well-known, its role in marine ecosystems and its modern implications remain understudied.

Summary from Wikipedia