caption: The image shows a close up of a sea pen, a type of jellyfish, on a rock in the ocean surrounded by aquatic plants. The jellyfish has a white body with a pinkish-purple hue and long, thin tentacles. Its eyes are large and round, and its mouth is slightly open, revealing its small, white teeth. Its tentacles are long and thin, and it is surrounded by a variety of colorful coral and other sea plants.