Who can identify those protozoa (see image below)?

More than 50,000 species have been described, most of which are free-living organisms; protozoa are found in almost every possible habitat. The fossil record in the form of shells in sedimentary rocks shows that protozoa were present in the Pre-cambrian era. read more

The protozoa can have very diverse lifecycles with multiple morphological stages, depending on species. Most protozoa have a cyst stage, which is dormant and highly resistant to environmental stress. In the disease-causing species, these cysts are often the mode of infection, frequently acquired by fecal-oral contamination. read more

The specimen is in focus, but contrast is poor. You can enhance contrast by moving the aperture diaphragm toward the closed position. This restricts the angles at which light strikes the specimen and thereby tends to eliminate the bright, washed-out appearance of the image. This is a better alternative than reducing lamp intensity. read more

while living in the gut of their host, intestinal protozoan parasites are usually in the trophozoite form. -as A group, protozoa exhibit both asexual and sexual reproduction. -most protozoa are motile via pseudopods, flagella, cilia, or undulating membranes. read more