Cladocerans

Part I of Essay
, or water fleas, are small (0.2-6 mm) aquatic crustaceans forming one of the orders of the Branchiopoda. Most inhabit quiet fresh waters. Along with the rotifers and copepods they account for most of the freshwater zooplankton yet most of them are benthic. Most are filter ....

Part II of Essay
.... of the lake or pond until spring at which time the eggs hatch. 1. Daphnia magna. Take a small culture dish to the instructor to receive a few living D. magna. This is a very large species, as go, and one that is easily cultured in the laboratory. Return to your bench and observe the animals using the dissecting microscope. Note the characteristic jerky swimming motion. The uneven appearance of this motion is a result of there being only one pair of locomotory appendages, or oars. Try to observe the movement of the second antennae, which ....