. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CHEMOAUTOTROPHIC SYMBIOSIS 377 5 um. •.. "IV y >9? :*}& .u*-i i , ' Figure 2. Transmission electron micrograph showing rod-shaped endosymbiotic bacteria in the bacte- riocytesofthegillofthe Mariana gastropod. Nuclei of the bacteriocytes(nu), lysosomes(ly), mitochondria (mi), and Golgi apparatus (ga) are found in the basal regions of the cells while the slender endosymbionts (es) are typically observed in the outer region of the cells arranged in a radial fashion. The outer surface of the bacteriocyte is covered w
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CHEMOAUTOTROPHIC SYMBIOSIS 377 5 um. •.. "IV y >9? :*}& .u*-i i , ' Figure 2. Transmission electron micrograph showing rod-shaped endosymbiotic bacteria in the bacte- riocytesofthegillofthe Mariana gastropod. Nuclei of the bacteriocytes(nu), lysosomes(ly), mitochondria (mi), and Golgi apparatus (ga) are found in the basal regions of the cells while the slender endosymbionts (es) are typically observed in the outer region of the cells arranged in a radial fashion. The outer surface of the bacteriocyte is covered with microvilli (mv). Inset. Enlargement of endosymbionts showing cell membranes (scale bar = 1 Mm.). could find more suitable habitat in the face of diminish- ing vent flow. Endosymbioses between sulfur bacteria and bivalve molluscs have been described worldwide from deep-sea hydrothermal vents, sewage outfalls, mangrove swamps, and other environments where there is simultaneous ac- cess to reduced sulfur compounds and molecular oxygen (Cavanaugh, 1983; Felbeck, 1983; Schweimanns and Felbeck, 1985). Although gastropods occur in many of these habitats, and large gastropod shells have been de- scribed at hydrothermal vents in the Manus Back-Arc basin near New Guinea (Both et a/., 1986), none until now have been reported to contain bacterial endosymbi- onts. From evolutionary and biogeographical stand-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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