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
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
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
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
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
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
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
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