Novel microbial and chemical components of a specific black-band region in the cockroach hindgut

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Abstract
An area of the hindgut of the cockroach, Eublaberus posticus, is characterized by its black color. This area is the site of accumulation of metal sulfides in the lumen next to the gut wall. In addition to the normal hindgut flora, two unusual procaryotic organisms are seen by both scanning and transmission electron microscopy only in this area of the hindgut. They are (i) a large rod (1.2 by 6 micrometers) with a tuft of polar flagella, many inclusion bodies, and a distinctive complex wall and (ii) an apparently flexible rod with a helically ridged wall. In addition, phagelike particles are described which are apparently infecting gram-positive bacteria attached to the gut wall in the black band area.