microscopic view of testate amoeba arcella shell with visible some of internal structure

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