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

Length of left exopod two about 1/3 the length of exopod one Claw with an irregular bump (ib)

Length of left exopod two 1/2 to 3/4 length of exopod one
Claw evenly curved
 
Taxonomy
Phylum Arthropoda
Subphylum Crustacea
Class Maxillopoda
Subclass Copepoda
Order Calanoida
Family Diaptomidae