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
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Setae on left antenna segments 17, 19, 20, 22 not hooked
Taxonomy
Phylum
Arthropoda
Subphylum
Crustacea
Class
Maxillopoda
Subclass
Copepoda
Order
Calanoida
Family
Diaptomidae