In this image Vorticella can be identified by Fresh-water Invertebrates of the United States: Protozoa to Molusca by Robert W. Pennak on pg. 38 fig. 4D.
This image shows a Copepod which can be identified by the Fresh-water Invertebrates of the United States: Protozoa to Molusca on pg. 411 fig. 1B.
Bibliography
Pennak, Robert W. 1989. Fresh-water Invertebrates of the United States: Protozoa to Molusca. New York (NY): Wiley.
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