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

Process as long or longer than the second to last segment

Process shorter than the second to last segment, typically no more than half its length
 
Taxonomy
Phylum Arthropoda
Subphylum Crustacea
Class Maxillopoda
Subclass Copepoda
Order Calanoida
Family Diaptomidae