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This group represents a serial series of sections. At the level of this section the funnel shaped oral region is now reduced to a narrow cytopharyngeal tube extending toward the aboral region of the cell. A few cross-sectioned cilia are present in the tube. Remnants of food vacuoles fill the cell's aboral half. Six membranelles of the perioral ciliature are present as well as the macronucleus. TEM taken on 3/12/71 by R. Allen with Hitachi HU11A operating at 75kV. Neg. 3,800X. Bar = 2µm. Standard glutaraldehyde fixation followed by osmium tetroxide, dehydrated in alcohol and embedded in an epoxy resin. Microtome sections prepared thicker to accommodate the series. Additional information available at (

Biological Sources

NCBI Organism Classification
Halteria grandinella
Cell Type
cell by organism
eukaryotic cell
Eukaryotic Protist
Ciliated Protist
Cell Line
Carolina Biological Supply Co., NC, U.S.A.
Cellular Component
oral apparatus
food vacuole

Biological Context

Biological Process
oral apparatus organization
macronucleus organization


Richard Allen


This image is part of a group.


Image Type
transmission electron microscopy (TEM)
illumination by electrons
Imaging Mode
detection of electrons
Parameters Imaged
electron density
Source of Contrast
stain with broad specificity
Visualization Methods
stain with broad specificity
osmium tetroxide
uranyl salt
lead salt
Processing History
recorded image
Print scanned for Photoshop
Data Qualifiers
processed data
suitable for spatial measurements


Spatial Axis Image Size Pixel Size
X 1686px ——
Y 1746px ——
*CIL – Cell Image Library accession number. Please use this to reference an image.