Click on the image which your specimen most closely resembles. Has three stout caudal setae on each caudal ramus; last abdominal segments may curve off to one side (not a good indicator alone) Has five thin caudal setae on each caudal ramus; never has a bend in the last abdominal segments   Taxonomy Phylum Arthropoda Subphylum Crustacea Class Maxillopoda Subclass Copepoda Order Calanoida Family