Examining the highlighted area of your specimen, click on the image which most closely resembles your specimen.   Third segment from the end of the right first antenna with a long slender process (sp) and no hyaline lamella.  Third segment from the end of the right first antenna with hyaline lamella (hl). Third segment from the end of the right first antenna without any distinct process.   Taxonomy Phylum Arthropoda Subphylum Crustacea Class Maxillopoda Subclass Copepoda Order Calanoida Family