daphnia pleuroxus uncinatus, freshwater planktonic crustacean

algae antennules aquatic bioindicator biology body cell closeup copepods creek crustacea crustacean daphnia daphniidae education environment freshwater lake life macro microorganism microscope microscopic near organism plancton planktonic pleuroxus pond probably research river science shell small super swamp transparent uncinatus underwater water zoology zooplancton