Light micrograph of the hatching of the rotifer Adineta sp. The picture shows the newly hatched young rotifer (left) having just emerged from its egg (left). After a few minutes of extending and contracting itself, the young rotifer swims off in search of food. Rotifers are allied to roundworms. They are usually freshwater though some marine species are known. Magnification x100 (at 35mm size)