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

CIL:39251*  Cite 

Didinium nasutum showing the two prominent girdles of cilia in full metachronous beat. If you look at higher magnification you will see the occasional short, blunt clavate cilia. These are known to not contain central microtubules. (See Wessenberg, H. and Antipa, G. Studies on Didinium nasutum. I. Structure and ultrastructure. Protistologica 4:427-447). Also this specimen represents an early divider, and just anterior to the posterior girdle of cilia, the presumptive clevage furrow can be seen at higher magnification (See Small, E. B., Antipa, G. A. and Marszalek, D. The cytological sequence of events in the binary fission of Didinium nasutum (O. F. M.). Acta Protozool. 9:275-282). This micrograph was taken in 1968 by G. Antipa on a Cambridge Mark IIA operating at 20kV. The negative magnification is 842X. Further details are available at Wessenberg, H. and Antipa, G. 1970. Capture and ingestion of Paramecium by Didinium nasutum. J. Protozool. 17:250-270.

Biological Sources
NCBI Organism Classification
Didinium nasutum
Cell Type
cell by organism
eukaryotic cell
Eukaryotic Protist
Ciliated Protist
Cellular Component
oral apparatus
cell cortex
cell surface
motile cilium
clavate cilia
Biological Context
Biological Process
ciliary cell motility
cellular membrane organization
cellular architecture
cell division
Gregory Antipa (San Francisco State University)
Digital Object Identifier (DOI)
Archival Resource Key (ARK)
Image Type
recorded image
Image Mode
illumination by electrons
secondary_electron imaging
Parameters Imaged
illumination by electrons
secondary electron generation
secondary_electron imaging
Source of Contrast
detection of electrons
Visualization Methods
shadowing and plating
Processing History
recorded image
Data Qualifiers
raw, unprocessed data
Sample Preparation
chemically fixed tissue
Parducz fixative
lyophilized specimen
Au/Pd metal sputter-coat
Relation To Intact Cell
whole mounted tissue
Spatial Axis Image Size Pixel Size
X 5691px 18nm
Y 5432px 18nm