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Scientific classification Microcrustaceans-The copepods are the largest and most diversified group of crustaceans. Copepods can be found in many different shapes and sizes. There are over 14.000 species, 2.300 genera and 210 families. Important structural characteristics used to classify copepods are body shape, cylindrical segmented body, short articulated cylindrical segments, head, thorax, abdomen, antenna, antennule size, number of egg sacs, compound somite, thoracic and abdominal segments, ovary, pouch, limbs, number of segments and protective covering. etc. They have many moving parts. They are oar-footed, referring to the pair of swimming legs, Like protozoa and metazoa these microorganisms are strict aerobes and are more sensitive to toxic conditions than bacteria. Copepods are usually found only in a very stable activated-sludge environment or a lagoon system. Additional Information: They have a moderately long secondary antennae, and the females carry twin egg-sacs. They are typically 1-2 mm long. Although the usual length of adults is 1-2 mm, adults of some species may be as short as 0.2mm and others may be as long as 10mm. A common feature that unites all the copepod orders is a single simple eye in the middle of the head, at least in the larval stage. The cephalosome is a shield over the head and some thoracic segments distinguishes the free living forms. Where Found: They are found in many different types of water, including waste water clarifiers and lagoons. They are more often founds in large bodies of water and usually provide a good food source for fish and marine animals.One good thing, they are used as a measure of toxicity in a plant. If you actually have live ones living in your system, you know you should pass most or all Acute or chronic toxicity tests. How to Find Them: You will see them with the naked eye, but microscopic examination of a wet mount will determine if they are Daphnia or Copepods.
More on Cyclopod More to come soon! Would you like to see a closer look at some of the details of a rotifer or features of his feet or mouth? Check out the Rotifer enlargements at 400x and 1000x and see more fine details. . . . . .
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Organism:Copepods-
Cyclopoida
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