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Sieve Plates and Habitat Adaptation in the Foraminifer Planulina ornata
- Pacific Science
- University of Hawai'i Press
- Volume 57, Number 1, January 2003
- pp. 103-110
- 10.1353/psc.2003.0007
- Article
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Planulina ornata (d'Orbigny), a coarsely perforate species of foraminifera having a low trochospiral test, was recovered attached to phosphatic hardgrounds from the lower oxygen-minimum zone off Peru. Above the base of individual pores are calcified, perforate sieve plates, the largest so far described. Structure of the pores suggests a possible association with mitochondria and respiratory function. These large pores may facilitate extraction of the severely limited amount of oxygen from the ambient bottom waters at that locale.