This figure shows the connection between the peristome and the food vacuole forming zone where the alveoli end. The cytostome is the opening that connects these two zones. TEM taken on 6/13/69 by R. ...

This group represents a serial series of sections. At the level of this section the macronucleus, cytopharyngeal tube, food vacuoles, and perioral membranelle are evident. TEM taken on 3/12/71 by R. A...

This group represents a serial series of sections. At the level of this section, the bottom of cytopharyngeal tube with one cilium remaining. End of macronucleus, three membranelles of the pek, and ma...

In an enlargement of a pronucleus in the chromatin material appears as sparsely scattered opaque bodies, as may be expected of a haploid nucleus, in a medium dense nucleoplasm. The nuclear envelope of...

High resolution overview of Opercularia coarctata with macronucleus, cytoplasm, and section of the oral area. Specialized rough endoplasmic reticulum with modification into decorated tubules that lie ...

High resolution image of Halteria fixed in cacodylate-buffered fixative and stained. The round, dark bodies, possibly pigment granules, which were transparent in other preparations are electron-opaque...

High resolution image of the DNA replication band in macronucleus of Halteria. Like hypotrichs the macronucleus of this oligotrich has a DNA replication band where DNA is synthesized. The nucleolus is...

High resolution transmission electron micrograph of a portion of the macronucleus of Opercularia coarctata containing irregularly shaped heterochromatin bodies and elliptical nucleoli. Ribosome-like p...

An image of the micronucleus and macronucleus of Opercularia coarctata. The nuclear envelope has numerous pores, at least as many per unit length as in the macronucleus. Some areas of the outer membra...

High resolution image of the macronucleus of Coleps hirtus. Heterochromatin and nucleoli are seen as smaller and larger stained bodies, respectively, in the macronucleus. Many nuclear pores exist in t...