An Introduction to Copepod Diversity, by G. A. Boxshall. The Ray Society, London, United Kingdom. 2004. 966 p. ISBN 0-903874-31-8.

Copepods comprise a subclass of crustaceans with representatives living in marine and freshwater habitats as well as in moist soils; they are numerous regarding species richness and individual abundance. For example, it is estimated that about 25% of all extant crustacean species are copepods, and copepod individuals outnumber all other metazoans combined in some environments. But beyond such impressive statistics, copepods influence ecosystems. Free-living copepods help to form the hub of marine food webs and support many important commercial fisheries. Some copepods are medically important, such as species that serve as intermediate hosts for parasitic nematodes that debilitate thousands of people annually. Ho (2001) estimated that about 33% of all copepod species are symbionts, and some of these are economically important pathogens, such as two...

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