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

Base of the process (bp) starts at the middle of the segment

Base of the process (bp) starts at the apex of the segment
 
Taxonomy
Phylum Arthropoda
Subphylum Crustacea
Class Maxillopoda
Subclass Copepoda
Order Calanoida
Family Diaptomidae