Slide 53:

Most copepods are so small that we see them only as pale specks moving jerkily through the water. But we have at least one species three millimeters long, which occurs commonly in ponds. Copepods usually have long segmented antennae, and a club-shaped body. This one is a male, swimming on its back. Females carry their eggs in one or two sacs attached to the base of the abdomen. The male shown has his right antenna thickened and modified to help grasp a female during mating.