Genus of nonphotosynthetic, nonfruiting, gram-negative, chemoorganotrophic, gliding bacteria that exist as multicellular filaments with the long axis of individual cells perpendicular to the long axis of the filament. The cells are flattened and curved to yield a convex-concave, crescentic symmetry. Isolated from the oral cavity of mammals. Type species is Simonsiella muelleri.
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Examples: glitazone, GI cocktail, etc.