This multicellular organism, called a rotifer, is laying an egg as it’s slowly being devoured by a single-celled organism known as a heliozoon. . Rotifers are animals, with a simple brain, gut, muscles, and more, but they’re often eaten by unicellular organisms like this heliozoon. Heliozoa are amoeba-like unicellulars, also known as “sun animalcules” because of the sun-ray-like structures that extend from their cell. They use these rays to capture food and to move, almost like a tiny sea urchin