Thalassia testudinum, commonly known as turtle grass, is a seagrass species found in shallow coastal waters of the Caribbean Sea and the Gulf of Mexico. It plays a crucial role in marine ecosystems by providing habitat and food for various marine organisms, including sea turtles and manatees. This seagrass has long, ribbon-like leaves that can grow up to 1 meter in length. It forms extensive underwater meadows, which help stabilize sediments and improve water quality by absorbing nutrients and carbon dioxide. Thalassia testudinum is vital for maintaining biodiversity and supporting fisheries in its habitat.