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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) located in middle (m3) or proximal (p3) third of segment

Lateral spine (ls) located in distal third (d3) of segment
Phylum Arthropoda
Subphylum Crustacea
Class Maxillopoda
Subclass Copepoda
Order Calanoida
Family Diaptomidae