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Examining the highlighted area of
your specimen, click on the image below
which most closely resembles your specimen.
Hair (h) at bottom of second segment (2)
extends past top (t) of ramus
Hair (h) at bottom of second segment (2)
does not extend past (t) top of ramus
 
Taxonomy
Phylum Arthropoda
Subphylum Crustacea
Class Branchiopoda
Suborder Cladocera
Family Daphniidae
Genus Daphnia