image_list image_listE

Oligohymenophorea (formerly Nassophorea): Peniculida: Parameciidae

Paramecium caudatum
Ehrenberg, 1838

Behavior of micronuclei during conjugation


Metapase of the first meiotic division

P. caudatum; conjugating pairs; A, metapase of the first meiotic division;
B, the first meiotic division; C, the stage just before nuclear exchange;
living cells observed by differential-interference-contrast microscopy;
by A. Yanagi
Paramecium caudatum, micronuclei during conjugation Paramecium caudatum, micronuclei during conjugation
P. caudatum; conjugating pair at metapase of the first meiotic division;
A, normal; B, abnormal pycnosis induced by vinblastine; double-stained
by Feulgen reaction and Fast green; by A. Yanagi
Paramecium caudatum, micronuclei during conjugation Paramecium caudatum, micronuclei during conjugation

Second meiotic division

P. caudatum; conjugating pair at the second meiotic division; A, normal;
B, round-shaped micronuclei induced by vinblastine; living cells observed
by differential-interference-contrast microscopy; by A. Yanagi
Paramecium caudatum, micronuclei during conjugation Paramecium caudatum, micronuclei during conjugation

From Second meiotic division to the nuclear exchange

P. caudatum; conjugating pairs from the second meiotic division to the
stage of nuclear exchange; stained by Feulgen reaction; by A. Yanagi
Paramecium caudatum, micronuclei during conjugation

From the second meiotic division to nuclear exchange

P. caudatum; conjugating pairs from the second meiotic division to
the stage of nuclear exchange; living cells observed by
phase-contrast microscopy; by A. Yanagi
Paramecium caudatum, micronuclei during conjugation Paramecium caudatum, micronuclei during conjugation Paramecium caudatum, micronuclei during conjugation Paramecium caudatum, micronuclei during conjugation Paramecium caudatum, micronuclei during conjugation
Paramecium caudatum, micronuclei during conjugation Paramecium caudatum, micronuclei during conjugation Paramecium caudatum, micronuclei during conjugation Paramecium caudatum, micronuclei during conjugation Paramecium caudatum, micronuclei during conjugation
Paramecium caudatum, micronuclei during conjugation Paramecium caudatum, micronuclei during conjugation Paramecium caudatum, micronuclei during conjugation Paramecium caudatum, micronuclei during conjugation Paramecium caudatum, micronuclei during conjugation
Paramecium caudatum, micronuclei during conjugation Paramecium caudatum, micronuclei during conjugation Paramecium caudatum, micronuclei during conjugation Paramecium caudatum, micronuclei during conjugation

Just before nuclear exchange

P. caudatum; conjugating pair at the stage just before nuclear exchange;
A, normal; B, abnormal pycnosis induced by vinblastine; double-stained
by Feulgen reaction and Fast green; by A. Yanagi
Paramecium caudatum, micronuclei during conjugation Paramecium caudatum, micronuclei during conjugation

Stage of nuclear exchange

P. caudatum; conjugating pairs at the stage of nuclear exchange; A,
living pair observed by differential-interference-contrast microscopy;
B, stained by Feulgen reaction; by A. Yanagi
Paramecium caudatum, micronuclei during conjugation

Please click on images for viewing enlarged.
Copyright Protist Information Server