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Tintinnid ciliates have been shown to be important components of many marine food webs, and several studies have been conducted to quantify their ingestion rates. The actual mechanism they use for prey capture, however, is not yet known. Extrosomes, membrane bound extrusible bodies subpellicularly located, are common in the ciliated Protozoa, and have diverse functions. Many species of tintinnid have been found to possess striae: cytoplasmic, capsule (extrosome) containing evaginations associated with the oral membranelles. To begin to test the hypothesis that the striae and the associated capsules are involved in prey capture, Stenosefnella oljva and several species of the genus Tintinnopsis were used. Tintinnids were field collected and divided into 2 groups, one which was fed, the other unfed for about 20 h, in a series of experiments. Subsequent scanning electron microscopic examinations revealed numerous striae associated with the oral membranelles of the fed group, while the unfed group exhibited a paucity of these structures. Large sac-like bodles were observed in one well-fed individual. It is suggested that the striae and associated capsules may be used to capture prey.

Ciliate feeding: effect of food presence or absence on occurrence of striae in tintinnids