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The peripheral membranes of the micro-organisms of the mycetocytes of adult midgut caecae and of larval mycetomes of Sitophilus granarius (L.), GG strain, have been examined with an electron microscope. The majority of the mycetocytes were depleted of intracellular organelles but contained large numbers of mycetomal micro-organisms, most of which exhibited only one peripheral membrane. Some mycetocytes, however, had well-developed ultrastructure and harboured mycetomal micro-organisms which showed two peripheral membranes, namely a cell wall and plasma membrane. Intermediate conditions also occurred. It is suggested that the absence of host-provided membranes around the micro-organisms categorizes them as obligate symbiotes.

Ultrastructure and Peripheral Membranes of the Mycetomal Microorganisms of Sitophilus granarius (L.) (Coleoptera)