Abstract
At present there are approximately 11500 known species of copepods. The number of species described during the past 27 years is nearly two-thirds of all those described in the previous 100 years. Approximately one-third of marine copepod species are parasites or associates, nearly equally divided between those on fishes and those on invertebrates. Individual copepods are extremely abundant, not only as free-living species or parasites of fishes, but as associates of invertebrates, especially in the tropical regions of the world.
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Humes, A.G. How many copepods?. Hydrobiologia 292, 1–7 (1994). https://doi.org/10.1007/BF00229916
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DOI: https://doi.org/10.1007/BF00229916