It's an imaged based key to the Zooplankton of the Northeast(USA)
When identifying zooplankton, especially rotifers, natural variability and variability due to preservation techniques exists. If a specimen does not appear to fit a couplet, do not select one just because the specimen is "close enough" as you may have a new or different species. Please refer to the taxonomic references if you think you have something not illustrated in the key.
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