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Species Identity of Commercial Stocks of Paramecium in the U.S

Species Identity of Commercial Stocks of Paramecium in the U.S

Authors :
Ruchir Sehra
Willis H. Johnson
Thomas A. Cole
Source :
The American Biology Teacher. 54:299-302
Publication Year :
1992
Publisher :
University of California Press, 1992.

Abstract

The "aurelia" group of the genus Paramecium (Wichterman 1986) contains three major species-complexes of slipper-shaped organisms. P. aurelia is generally distinguishable from P. caudatum and P. multimicronucleatum on the basis of size (120 ,um-180 ,um length) and its possession of two vesicular micronuclei (approximately 3.5 ,um in diameter). Distinguishing between P. caudatum and P. multimicronucleatum is more difficult because of overlapping size ranges (P. c.: 170 ,um300 pkm long; P. m.: 180 ,um-350 gm long). P. caudatum has one compact micronucleus (8,um-14,um in diameter) and P. multimicronucleatum has between four and eight vesicular ones (0.7 ,m-5 gm in diameter). P. jenningsi is a more recently described member of the "aurelia" group; it has two micronuclei which are larger than those of P. aurelia. Persons without extensive experience in observing members of these species-complexes of Paramecium are inclined to consult How to Know the Protozoa (ahn et al. 1979; Jahn & Jahn 1949). The first revised edition (ahn & Jahn 1949, p. 188) gives directions for distinguishing these species-groups on the basis of micronuclear staining

Details

ISSN :
00027685
Volume :
54
Database :
OpenAIRE
Journal :
The American Biology Teacher
Accession number :
edsair.doi...........695b03c02d586757a7d8780d4a633b31
Full Text :
https://doi.org/10.2307/4449483