Cortical slippage in Tetrahymena

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Abstract
Two strains of Tetrahymena pyriformis manifest similar deviations from the usual pattern of stomatogenesis. Some of the cells develop oral anlagen in the normal manner on the right postoral meridian (meridian 1), but others have oral primordia displaced to the left or (less frequently) to the right by one or more ciliary rows. The other caudal organelles, the cytoprocts and contractile vacuole pores, are displaced in a similar manner. In the course of successive fissions and repeated stomatogenic shifts, the stomatogenic site, and indeed all cortical structures, are expected to completely circumnavigate the cell. These observations support the interpretation that the various kineties are not permanently differentiated with respect to their morphogenetic capacities.

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