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 process that is curved (cp) or straight (sp)      Third segment from the end of the right first antenna with a 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 Diaptomidae