A new finding of intracellular bacterial symbionts in the Nerillidae (Annelida: Polychaeta)

Tzetlin, A.B.; Saphonov, M.V.

Авторы: Tzetlin A.B., Saphonov M.V.
Журнал: Russian Journal of Aquatic Ecology
Том: 4
Номер: 1
Год издания: 1995
Первая страница: 55
Последняя страница: 60
Аннотация: Symbiotic bacteria were found in the epidermal cells of two representatives of meiofaunal group Nerillidae (Polychaeta Annelida). The bacteria inhabit highly specialized epidermal cells, bacteriocytes of Trochonerilla mobilis (from the marine aquaria in Moscow) and Micronerilla brevis from the subtidal of the White Sea. These bacteriocytes lack nuclei, and contain large vacuoles with numerous bacteria. Vacuoles are penetrated by irregular cytoplasmic extensions. The presence of residual bodies of lyzosomes in the bacteriocytes is the evidence of intracellular digestion (endocytosis) of bacteria. Energy nature of the symbiotic relations between bacteria and hosts in both species is assumed. The discovery of bacteria in adults, juveniles, and embryos and the presence of highly specialized bacteriocytes observed in both species give the reason to suggest that the symbiosis is obligate. In addition, Micronerilla brevis has symbiotic gramm-negative bacteria in the basicuticular zone. Bacterial cells in the cuticle are similar to intraepidermal ones. Whether these two different types of bacteria observed in the epidermis and cuticle of Micronerilla are two different species or two different life cycle stages was not determined. This is the first finding of symbiotic bacteria in Nerillida.
Добавил в систему: Цетлин Александр Борисович

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A new finding of intracellular bacterial symbionts in the Nerillidae (Annelida: Polychaeta)статья

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