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Examining the highlighted area of your specimen,
click on the image below which most closely
resembles your specimen.
Spines over posterior 3/4 of ventral margin Spines over slightly more than 1/2 of ventral margin
 
Taxonomy
Phylum Arthropoda
Subphylum Crustacea
Class Branchiopoda
Suborder Cladocera
Family Daphniidae
Genus Daphnia