The cytology of a new species of spirostomum

Seshachar, B. R. ; Padmavathi, P. B. (1956) The cytology of a new species of spirostomum Journal of Eukaryotic Microbiology, 3 (3). pp. 145-150. ISSN 0022-104X

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A study has been made of the cytology of an undescribed species of Spirostomum. The species is much smaller than S. ambiguum. The peristome extends to about half the length of the animal, whereas in S. ambiguum it is about two-thirds the body length. The nuclear apparatus reveals some striking differences. The macronucleus is cylindrical, and not chain-like, in the vegetative animal. The micronuclei are far fewer than in S. ambiguum and number 6-15, but are larger in size. During binary fission, the macronucleus becomes condensed into an oval or polymorphic mass and is drawn out again into a cylinder before it is cut into two lengths. The micro-nuclei divide by mitosis and, whatever their number in the vegetative animal, only 7-8 take part in the division. The others presumably degenerate.

Item Type:Article
Source:Copyright of this article belongs to John Wiley and Sons.
ID Code:76990
Deposited On:09 Jan 2012 08:22
Last Modified:09 Jan 2012 08:22

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