The membranelles of the AZM extending from the ventral side of the oral cavity are largely composed of 2 rows of cilia. A dikinetid of the somatic surface is also present. This dikinetid also has pigm...

A high magnification view of the above septum in planar view and the septal pores that connect adjacent alveoli. The pores always lie next to the junction of the septum with the outer alveolar membran...

Opercularia is named for a ciliated flap (operculum) that is adoral to the opening to the oral region. However, this operculum is pulled back into the body when the myonemes are fully contracted as in...

Striated band spanning the base of a longitudinal ridge (kinetodesmal fibers are seen in the ridge in cross section). The epiplasm appears absent from the top of the ridge or is replaced by two thicke...

A high resolution image of the detail of cell surface structures. The cell is covered by the plasma membrane and outer alveolar sac membrane which is separated from the inner alveolar sac membrane by ...

High resolution image of the detail of the three fibers supporting a basal body. A striated kinetodesmal fiber extends anteriorly from the basal body, a postciliary microtubular ribbon extends posteri...

A high resolution overview of Opercularia coarctata showing that cytostome divides the peristome from the cytopharynx. The cytopharynx starts where the alveoli end in the oral region. TEM taken on 6/1...

The cytostome of Opercularia divides the peristome from the cytopharynx. The cytopharynx starts where the alveoli end in the oral region. TEM taken on 6/13/69 by R. Allen with Philips 300 operating at...

High resolution image of the cytoproct is the site of spent vacuole defecation on the surface of Paramecium. When closed the cytoproct forms a long narrow wavy ridge along the posterior suture. At its...

High resolution image of a cell sectioned perpendicular to the surface. The parasomal sac ends internally as a coated pit, coated with clathrin. Where the coated pit has pinched off a clathrin-coated ...