Examining the highlighted area of your specimen, click on the image below which most closely resembles your specimen. Slender process (sp) is generally straight and blunt and as long or longer than the second to last segment Slender process (sp) is curved and pointed and shorter in length than the second to last segment     Taxonomy Phylum Arthropoda Subphylum Crustacea Class Maxillopoda Subclass Copepoda Order Calanoida Family Diaptomidae