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Biol Bull 177: 130-140. (August 1989)
© 1989 Marine Biological Laboratory
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Bacterial Aggregates Within the Epidermis of the Sea Anemone Aiptasia pallida

EDWARD E. PALINCSAR 1, WARREN R. JONES 1, JOAN S. PALINCSAR 1, MARY ANN GLOGOWSKI 1, and JOSEPH L. MASTRO 1

1 Department of Biology, Loyola University, Chicago, Illinois 60626

Bacteria in cyst-like aggregates have been observed in the sea anemone Aiptasia pallida. Algal symbionts, common in certain Cnidaria, including Aiptasia, are located in the gastrodermis, while the bacteria described in the present study were found exclusively in the epidermis. They were gram-negative and packed closely together within what appeared to be a single cell. The bacterial sac varied in size according to the number of bacteria it contained. Ultrastructural features of the bacteria included numbers of large vacuoles or inclusions often intertwined with web-like nucleoids in the central region. Aggregates in situ showed a whorled arrangement of the bacteria and maintained this pattern and their structural organization after extrusion from anemone epidermis. A fatty acid profile suggested that the bacteria may belong to the genus Vibrio.

Submitted on October 12, 1988
Accepted on May 31, 1989




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