stentor structure

stentor anatomy heterotrphic observe times ciliate protist antique polymorphous historic natural etching old history ancient aquarium animalcules species growth art line ciliates filter genus feeding heterotrichs infection medical membrane macronuclear nodes cell holdfast food vacuoles oral pouch protozoan cortex micronucleus set nucleus flagellate medicine ectoplasm structure diagram 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