: Biofilm Architecture and Age-Dependent Pleomorphy.

Round bodies in spirochete cultures have been a controversial subject since their description seven decades ago. We report the existence of round bodies (spherical cells) in cultures of , a spiral bacterium phylogenetically distant from spirochetes. Furthermore, when grown in biofilms, demonstrates a unique morphology known as cording, which has been previously described only in mycobacteria. Thus, has two distinct features, each previously thought to be unique to two different phylogenetically distant groups of bacteria.