microscopic view of testate amoeba centropyxis aculeata shell

aculeata ameba ameboid amoeba animal biology brightfield brownish centropyxis chitin chitinous close debris education educational enlarge enlarged freshwater illumination light macro magnification magnify micrograph microphotograph microphotography microscope microscopic microscopy nature organism protist protozoa protozoan science scientific shaped shell test testacea testate thecamoeba thecamoebians transmitted umbrella unicellular yellowish zoological zoology