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Examining the highlighted area of your specimen, click on the image below which most closely resembles your specimen.
Setae on left antenna segments 17, 19, 20, 22 with ends stiffly hooked (h) (View at 200x)
 
Setae on left antenna segments 17, 19, 20, 22 not hooked
 
Taxonomy
Phylum Arthropoda
Subphylum Crustacea
Class Maxillopoda
Subclass Copepoda
Order Calanoida
Family Diaptomidae