|Prokaryote, Eubacteria Sheathed heterotrophs
|Herpetosiphon, Thioploca and Thiothrix nivea which also have sheaths are a lso included in Nonphotosynthetic, Nonfruiting Gliding Bacteria in the non fruiting section. The genus Lyngbya which is one of the cyanobacteria also has a sheath.
|Gram-negative (Volker et al. 1977).
|Cells cylindrical to disk-shaped, 0.6-5.0 um in diameter, dividing by cross-septation to form sheathed filaments up to 1 cm long and often attached to a firm substrate
|Some cell chains show a gliding motility (Bump and Schweisfurth 1981).
|. Filaments are unbranched but may occasionally show what appears to be false branching. The very thin sheaths surrounding the filaments may be colourless at the tip or encrusted with iron (or manganese) oxides at the base. Filaments may show increased cross-septation on one or both free ends to form spherical propagation cells ("macrogonidia") with the same diameter as the rod-shaped cells. Presumably, these macrogonidia are liberated from the sheath ends, and they may elongate and cross-septate to form new sheathed filaments. Some of the Crenothrix filaments widen at the end(s), and here the cells undergo cross-septation and longitudinal septation. Numerous, small, cubical cells arising in this fashion ("microgonidia") are rounded up and are also released from the filament tip.
|This organism has not been grown on artificial media in pure culture.
|Found in stagnant and running waters containing low concentrations of organic matter, Fe2+ and traces of methane.
|G+C Mol %
|Cohn,F. 1870. Uber den Brunnenfaden (Crenothrix polyspora) mit Bemerkungen uber die mikroskopische Analyse des Brunnenwassers Beitr. Biol. Pflanz. 1875 1:108-131
|p 2006 P. Hirsch
|Volker,H., R. Schweisfurth and P. Hirsch. 1977. Morphology and ultrastructre of Crenothrix polyspora J. Bacteriol 131:306-313