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

Lateral spine (ls) of terminal exopod segment located in distal third (d3) of exopod; terminal exopod segment of right 5th leg slender in appearance.

Lateral spine (ls) of terminal exopod segment located in middle third (m3) of exopod; terminal exopod segment of right 5th leg of usual appearance.

 
 
Taxonomy
Phylum Arthropoda
Subphylum Crustacea
Class Maxillopoda
Subclass Copepoda
Order Calanoida
Family Diaptomidae