ostracod is a small crustacean found in a freshwater pond. zooplankton, micro crustacean

ostracod small crustacean found freshwater pond zooplankton micro biology zoology macro zoological plankton lake water planktonic fauna zoo microscope macrophotography microphoto microscopic floating crustacea scientific aquatic fresh underwater micrograph closeup microbiology aquaculture eye crustaceans microorganism copepoda hydrobiology biologist invertebrates close light magnification 100 times objective 10