You have identified your specimen to the Genus Moina: Specimen < 1.2 mm, no hair on head or valves If your specimen is > 1.2 mm or has has hair on its head or valves, your specimen may be M. affinis, M. wierzejskii or M. brachycephala   Taxonomy Phylum Arthropoda Subphylum Crustacea Class Branchiopoda Suborder Cladocera Family Moinidae Genus Moina