Dragonflies and damselflies are predatory both in the aquatic nymphal and adult stages. The stick insect life cycle is hemimetabolous, proceeding through a series of nymphal stages. This species goes through five nymphal stages. This usually happens in the sixth or seventh nymphal stage. "D. andersoni" is a three-host tick with larval, nymphal, and adult life stages. The Phasmatodea life cycle is hemimetabolous, proceeding through a series of several nymphal instars. These locations are where nymphal ticks seek out hosts. Hatchlings typically go through four nymphal stages before becoming adults. A similar structure in nymphal stoneflies (Plecoptera) is of uncertain homology. Or, the nymphal ticks can be darker. The nymphal pheromone is different from the adult one. Oribatid mites have six active instars&colon; prelarva, larva, three nymphal instars and the adult. Nymphal population density also affects the dispersal of water striders. In the final nymphal instar, they construct an exit tunnel to the surface and emerge. If any nymphal stages are absent, then authors may disagree on which stages are present.