The litterol zone is also the scene of the greastest concentration of animals. They, too, are distributed in recognizable communities. In or on the bottom are various dragonfly nymphs, crayfish, isopods, worms, snails, and clams.Other animals live in or on plants and other objects projecting up from the bottom. These include the climbing dragonfly or damselfly nymphs, rodofers, flatworms, briozoa, hydra, snails, and others. The zooplankton consists of water fleas, such as daphnia, rodofers, and ostrocobs. The larger, free swimming fauna, called nectin, includes diving beetles and bugs, ditris larvae, such as larvae of mosquitoes and large numbers of many other insects. Among the vertebrae are frogs, salamanders, and turtles. Newston or floating members of the community include whirley jig beetles, water streamers, and numerous protozoa. Many pond fish, such as sunfish, top minnows, bass, and pike spend much of their time in the litterol zone procuring food.

Match the following life zones of freshwater lakes to the correct description.