I found this colony of Stentors between moss leafs. The images were taken under polarized light with a retarder.
Stentor, polarized light
Stentor, polarized light
Stentor, darkfield
Nassula ornata - focus on the cortex. The pore of the contractile vacuole and the oral apparatus (nasse) is visible.
This is a peek inside Nassula ornata. You can see the contractile vacuole, the cyrtos and the nucleus. Nassula feeds mainly on cyanobacteria. Food vacuoles that contain cyanobacteria change their color with the digestion progress: green --> purple --> brown --> gold.
Paramecium bursaria
Paramecium bursaria cilia
ma - macronucleus, mi - micronucleus, oa - oral apparatus, cv - contractile vacuole, amp - ampullae, cca - collecting canals, fv - food vacuole, cry - crystals, zc - zoochlorella, zcid - deviding zoochlorella
Paramecium bursaria, fluorescence
Vaginicola sp. with symbiotic algae (zoochlorella) coming out of his lorica.