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Examining the highlighted area of your specimen, click on the image below which most closely resembles your specimen.
Straight process (sp) that is generally blunt and as long or longer than the second to last segment Curved pointed process (cp), typically shorter in length than the second to last segment, but may be as long or longer
Phylum Arthropoda
Subphylum Crustacea
Class Maxillopoda
Subclass Copepoda
Order Calanoida
Family Diaptomidae