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Examining the highlighted area of your specimen, click on the image below which most closely resembles your specimen.
Length of caudal ramus (cr) > three times its width Length of caudal ramus (cr) < three times its width
 
Taxonomy
Phylum Arthropoda
Subphylum Crustacea
Class Maxillopoda
Subclass Copepoda
Order Calanoida
Family