stentor anatomy

stentor diagram anatomy structure etching natural historic heterotrphic times ciliate polymorphous protist observe history ancient aquarium animalcules species growth line ciliates filter genus feeding heterotrichs infection medical membrane macronuclear nodes cell holdfast food vacuoles protozoan cortex micronucleus set nucleus flagellate medicine ectoplasm oral pouch animal vintage trumpet microbiology black drawing white engraved engraving microorganism protozoa nature organism magnification biology vector zoology endoplasm microscopic gullet amoeba microscopy contractile vacuole euglena difflugia micro single