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Light micrographs of Vorticella microstoma (ATCC, strain #
30897). a) a single extended zooid atop an uncoiled stalk. The
perioral cilia form rings of beating cilia at the top of the
bell-shaped zooid. b) two zooids bound to two stalks attached
to the substrate at nearly the same point. The perioral cilia are not
evident. The spasmoneme appears as a helical shaft passing through the
stalk’s length. c) the same two zooids as in b but after
contraction of the stalks and the myonemes in the zooids. The cell in
figure 1 was fixed in this contracted state. d to f are
three different orientations of two zooids in the final stage of
division attached to the same stalk. The perioral chambers are open
and the cilia are actively beating in both zooids bringing a current
containing bacteria against the opening into the peristome where the
bacteria are passed into the cytopharynx and nascent food vacuole.
Micrographs taken by R. Allen on11/6/75.
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