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Examining the highlighted area of your specimen, click on the image below which most closely resembles your specimen.
Tip area of rostrum with more
elongated polygon markings
Tip area of rostrum with roughly
symmetrical polygon markings
Phylum Arthropoda
Subphylum Crustacea
Class Branchiopoda
Suborder Cladocera
Family Daphniidae
Genus Daphnia