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 Lateral spine (ls) of terminal exopod segment located in middle third (m3) of exopod Lateral spine (ls) of terminal exopod segment located in proximal third (p3) of exopod   Taxonomy Phylum Arthropoda Subphylum Crustacea Class Maxillopoda Subclass Copepoda Order Calanoida Family Diaptomidae