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Examining the highlighted area of your specimen, click on the image below which most closely resembles your specimen.

2nd abdominal process (2) is about
½ the length of the 1st (1)
2nd abdominal process (2) less than
½ the length of the 1st (1)
 
Taxonomy
Phylum Arthropoda
Subphylum Crustacea
Class Branchiopoda
Suborder Cladocera
Family Daphniidae
Genus Daphnia