The contractile vacuole and cortex of Didinium nasutum showing an extrusive organelle (cyrtocyst) of unknown function. Further details available at Wessenberg, H. and Antipa, G. 1968. Studies on Didin...

The CV membrane has collapsed into regularly spaced tubules oriented perpendicular to the microtubular ribbon in this ruptured cell. Some tubules and some nearby vesicles contain electron opaque mater...

A low power view of a median transverse section of a green Trichodina that lives on the surface of a freshwater snail collected in central Illinois. In this view the abundant endosymbiotic zoochlorell...

This section of Conchophthirus is at the edge of the cortex showing the striated fibers and microtubules that attach to ciliated basal bodies. In particular, enlarged glancing longitudinal views of bo...

A high resolution image of a dikinetid in cross section near its proximal end. A postciliary ribbon and a transverse ribbon are seen. A short kinetodesmal fiber buds from the side of the kinetid. Coat...

A high resolution image of a section through the cytopharynx of Coleps showing the corrugated lips containing lamellae surrounding the atrium of the buccal cavity. Rods composed of hexagonally packed ...

High resolution image of longitudinal section of somatic cilia showing the axoneme, basal body, and attached fibrous and microtubular elements. Adjacent digestive vacuoles and cortical cytoplasm evide...

A high resolution micrograph showing the striated kinetodesmal fiber extending to the pellicle from the basal body where it terminates against the epiplasm. A bundle of microtubules extends into the c...

High resolution image of the nucleoli of the macronucleus. Nucleoli have a core of DNA that contains the genes that are transcribed into ribosomal RNA. Assembly of the ribosomal subunits from this pro...

Mucocysts have a herringbone pattern of subunits and are surrounded by a membrane that fuses with the plasma membrane. When the mucocyst content is extruded the content expands (see Hausmann, Protisto...