Intracellular procaryotic cells were consistently that the bacteria found in larvae might represent a found in TEM observations of pnmary oocytes and follicle transmission stage of the gill symbionts which had cells of the deep-sea seepage clam Calyptogena soyoae.been introduced into eggs in cryptic forms.Among These bacteria resembled gill endosymbionts in the following 3 polnts: dimensions and general outllne, occurrence of elec-deep-sea tZlftia pachyptila was tron-transparent vacuoles in the periplasm, and occurrence of establish syn~biosis by talung up bacteria from freeelectron-dense materials in the periplasm.Eggs which harbored bacteria were all in the vitellogenic stage.This finding suggests some restricted time schedule of the entry of bacteria into oocytes.It is hypothesized that these bacteria represent transmission stage of gill symbionts, and continuum of the symbiosis is maintained by maternal inheritance through egg infection.
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Endow et al. (1990) studied this question.