Accumulation and transport of minerals by marine protozoa. Final report, September 1, 1975--November 30, 1978. [Ultrastructural studies of cultures of Tintinnopsis power]
Lorica building was studied experimentally for Tintinnopsis parva, an agglutinated tintinnid. This species incorporated either siliceous or calcium-rich particles. Evidence of agglutination was seen within 30 min following the addition of particules to cultures of the protozoa. Fully agglutinated loricae were produced by the proter; partially incrusted loricae attributed to an opisthe were also recovered. The cytoplasmic evaginations of unknown function called striae were seen under the scanning electron microscope in better relief than ever before. They may provide the mechanism whereby the enclosed capsules are brought into contact with prey organisms. The tintinnid Tintinnopsis parva was reared in the laboratory and its ultrastructure compared with published records on other species. Capsules, unique inclusions restricted to this group of protozoa, were found mainly in the posterior cortical region and in the cytoplasmic evaginations connected to the large adoral membranelles. The constant position of the evaginations and the structure of the capsules suggest that both structures are important in food capture - the evaginations to provide the mechanism whereby the capsules are brought into proximity to food items; the capsules, possibly, to stun or inactivate the prey.
- Research Organization:
- New York Aquarium, Brooklyn (USA). Osborn Labs. of Marine Sciences
- DOE Contract Number:
- EY-76-S-02-3390
- OSTI ID:
- 6470109
- Report Number(s):
- COO-3390-34
- Country of Publication:
- United States
- Language:
- English
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