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The Biological Bulletin, Vol 179, Issue 3 332-339, Copyright © 1990 by Marine Biological Laboratory


GENERAL BIOLOGY

The Anatomy and Morphology of the Adult Bacterial Light Organ of Euprymna scolopes Berry (Cephalopoda:Sepiolidae)

M. McFall-Ngai and M. K. Montgomery
Department of Biological Sciences, University of Southern California, Los Angeles, California 90089-0371

The sepiolid squid, Euprymna scolopes, has a bilobed luminous organ in the center of the mantle cavity, associated with the ink sac. Luminous bacterial symbionts (Vibrio fischeri) are housed in narrow channels of host epithelial tissue. The channels of each lobe of the light organ empty into a ciliated duct, which is contiguous with the mantle cavity of the squid. Surrounding the symbiotic bacteria and their supportive host cells are host tissues recruited into the light organ system, including a muscle-derived lens and thick reflector that appear to permit the squid to control the quality of bacterial light emission.


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