A contractile vacuole in systole. The CV has collapsed into vesicles and tubules. Three CV pores can be seen where the CV meets the pellicle. Smooth membrane cisterna surrounds some cytoplasm, possibl...

The figure shows the beginning of the cytopharyngeal ribs of the ribbed wall. The peristome is bordered on one side by the paroral kinety that has 2 rows of basal bodies, of which only one is ciliated...

High resolution micrograph showing an overview of the peristome of Opercularia coarctata. The corrugated wall, the equivalent to the ribbed wall of Paramecium, contains tubular projections of alveoli ...

A myoneme of Opercularia coarctata. Such fibrous bundles are known to be composed of centrin, a filament that contracts when exposed to calcium. The ER is closely associated with the myonemes and send...

High resolution of the layer of contractile myonemes in Opercularia coarctata that covers most of the cytosolic side of the pellicle. Pellicular pores (the clathrin coated pits of ciliates) penetrate ...

High resolution image of elements of myonemal fibers which lie next to the epiplasm that lies internal to the plasma membrane and alveoli. A close association of the ER with the myonemes is seen. The ...

High resolution image of a myoneme of Opercularia coarctata. Such fibrous bundles are known to be composed of centrin, a filament that contracts when exposed to calcium. The ER is closely associated w...

This section is cut at a level where the macronucleus is folded so it appears to be in 2 parts and where the micronucleus is visible. Contractile vacuole, perioral kinetids, and the peristome is evide...

The peristome is covered on one side by the oral cilia and on the opposite by the ribbed wall. Lamellae from the ribbed wall extend into the nascent food vacuole forming region, the cytopharynx. This ...

The layer of contractile myonemes in Opercularia coarctata that covers most of the cytosolic side of the pellicle. Pellicular pores (the clathrin coated pits of ciliates) penetrate through this sheet....