The Ultrastructure of Tintinnopsis parva

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Abstract
Laboratory-reared T. parva were examined by EM and their ultrastructure compared with published studies on freshly preserved species from the plankton. Capsules, inclusions unique to the ciliate suborder Tintinnina, were smaller than in other species, but the organizational pattern was similar. Absent throughout the bulk of the cytoplasm except in the posterior cortical region, the capsules were especially numerous in the cytoplasmic evaginations connected with the adoral membranelles (as in other species). The position of the evaginations was constant. Striae (2) were present, a median and an external, on opposite sides of each adoral membranelle. Observations are reported on the lorica-building granules, the lorica proper and various cytoplasmic inclusions. Endocytoplasmic bacteria, present in many other species, were absent in the cultivated specimens.

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