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a) Differential-interference contrast light micrograph of
Vorticella in its extended and feeding state. The contractile
spasmoneme can be seen to follow a shallow helical path inside the
stalk. Cilia encircle the anterior (adoral) end of the cell. b)
Differential-interference contrast micrograph of a dividing stage of
Vorticella. During division one daughter cell retains the
contractile stalk and the second daughter is motile due to the
production of a ring of aboral cilia. Finding a suitable substrate
this cell will produce a stalk and its aboral cilia will be lost.
Photographs courtesy of Dr. Klaus Hausmann, Berlin, Germany.
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