Cladocerans

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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 are the locomotory appendages. If you have watched adult brine shrimp, Artemia, in motion, the difference should be immediately apparent. Adult Artemia have many pairs of oars and thus has a smooth, even motion through the water.
Try to capture an individual with a large bore plastic pipet and note the rapid evasive action these animals are capable of.

Prepare a wet mount of a single specimen using a coverslip with wax feet. because of the large size of these animals they require thick feet to support the coverslip. Place the slide on the stage of the compound microscope ...

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the setae increase the surface area in contact with the water during the power stroke. During the recovery stroke they collapse and their surface area is reduced.

The first antenna of females is very small but you can probably see it just posterior to the tip of the rostrum. This appendage is larger in males where it has a sensory function but it is very unlikely that your specimen is a male.

A pair of large compound eyes can be seen in the anterior region of the head. Focus on one of them and note that they are movable. If you look closely, you should be able to see the small muscles that are responsible for this motion. They extend posteriorly from the eye.

Many cladocerans, ...

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