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

CIL:40951*  Cite 

Didinium captures Paramecium. A moment after initial contact when toxicysts enter Paramecium. The strand of toxicysts can be seen between the two organisms, and Didinium will use the anchored toxicysts to reel in Paramecium to the awaiting proboscis which is opening to accept its prey. Also showing metachronous waves of cilia within the two characteristic ciliary girdles of Didinium nasutum; the waves on Paramecium may be paralyzed due to the effects of the attached toxicysts. This micrograph was taken in 1968 by G. Antipa on a Cambridge Mark IIA operating at 20kV. The negative magnification is 485X. 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
Paramecium sp.
Cell Type
cell by organism
eukaryotic cell
Eukaryotic Protist
Ciliated Protist
Cellular Component
oral apparatus
phagocytic cup
cell cortex
cell surface
Biological Context
Biological Process
phagocytosis, engulfment
Gregory Antipa (San Francisco State University)
Digital Object Identifier (DOI)
Archival Resource Key (ARK)
Grouping This image is part of a group.
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 3272px 26nm
Y 4000px 26nm