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Examining the highlighted area of your specimen, click on the image below which most closely resembles your specimen.
Right (R5L) and left fifth leg (L5L) of similar length
Left fifth leg (L5L) shorter than the right fifth leg (R5L).
 
 
Taxonomy
Phylum Arthropoda
Subphylum Crustacea
Class Maxillopoda
Subclass Copepoda
Order Calanoida
Family Diaptomidae