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

Spine on fifth leg large
Endopite 1 of 4th leg rectangular with convoluted edge
Edge of genital segment rounded

Spine on fifth leg small
Endopite 1 of 4th leg square with smooth edges
Egde of genital segment pointed
 
 
Taxonomy
Phylum Arthropoda
Subphylum Crustacea
Class Copepoda
Subclass Copepoda
Order Eucopepoda
Family Cyclopoida
Genus Acanthocyclops