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

Length of lateral spine (ls) ≥ length of second right exopod (ex)

Length of lateral spine (ls) < length of second right exopod (ex)
 
Taxonomy
Phylum Arthropoda
Subphylum Crustacea
Class Maxillopoda
Subclass Copepoda
Order Calanoida
Family Diaptomidae