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*CIL – Cell Image Library accession number. Please use this to reference an image.

CIL:9716*  Cite 

This micrograph may show important features involved in calcareous plate formation within the alveoli that underlie the plasma membrane in Coleps. Densities are seen on the inner alveolar membrane at its corners with septa. These densities are not known at this time in other ciliates and may be involved in calcareous platelet formation within the alveoli or in stabilizing the surface shape. Filamentous material fills the cytosolic space between two densities. Densities occur at the corners of the alveoli with the cytosol. A Golgi complex lies next to this quartet of densities. Smooth spongiome is also observed. Microtome sections prepared at approximately 75nm thickness. TEM taken on 5/23/69 by R. Allen with Philips 300. Neg. 18,500X. Bar = 0.5µm. A print of the negative was scanned and processed in Photoshop. This image is best used for qualitative analysis. A high resolution image (CIL:2867) is available for quantitative analysis. Additional information available at (

Biological Sources
NCBI Organism Classification
Coleps hirtus
Cell Type
eukaryotic cell
Eukaryotic Protist
Ciliated Protist
Cell Line
Cambridge Culture Collection, Cambridge, England, catalog # LB1656/1
Cellular Component
plasma membrane
alveolar membranes
Golgi apparatus
smooth spongiome
Biological Context
Biological Process
membrane transport
elevation of cytosolic calcium ion concentration
Molecular Function
possible calcareous plate formation
Richard Allen
Digital Object Identifier (DOI)
Archival Resource Key (ARK)
Grouping This image is part of a group.
Image Type
transmission electron microscopy (TEM)
illumination by electrons
Image 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 from negative scanned to Photoshop.
Data Qualifiers
processed data
suitable for spatial measurements
Spatial Axis Image Size Pixel Size
X 3000px ——
Y 2361px ——