planktonic crustaceans daphnia probably daphniidae scapholebris mucronata. freshwater zooplancton by microscope

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