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You have identified your specimen to the Genus Eurycercus:
 

Eurycercus has at least five species in North America, but species designations are confusing.

Pennak (1989) and Thorpe and Covich (1991)
Taxonomy
Phylum Arthropoda
Subphylum Crustacea
Class Branchiopoda
Suborder Cladocera
Family Chydoridae