| Cross Index | "Pelosigma" | 
| superset | Prokaryote, Eubacteria Gram-Negative curved bacteria | 
| Compare | Ancylobacter aquaticus ,"Brachyarcus thiophilus", Cyclobacterium marinum, Flectobacillus, Meniscus glaucopis, "Pelosigma", Runella slithyformis, Spirosoma linguale | 
| Contrast | Archaea | 
| Subset | 
| Morphology | "Pelosigma" | 
| CELLULAR | 
| Staining | Gram reaction not recorded | 
| Morphology | S shaped slender filaments arranged side by side in sigmoid aggregates of four or multiples of four | 
| Motility | Aggregate may be motile | 
| Specialized structures | 
| Division | Synchronous cross division of the aggregate and sudden appearance of the daughter aggregate | 
| COLONIAL | 
| Solid surface | 
| Liquid | 
| Growth Parameters | "Pelosigma" | 
| PHYSIOLOGICAL | 
| Tropism | |
| Oxygen | Oxygen is absent, sulfide present | 
| pH | 7.25-7.9 | 
| Temperature | |
| Requirements | |
| Products | |
| Enzymes | |
| Unique features | 
| ENVIRONMENTAL | 
| Habitat | Has NOT been isolated in pure culture Occur in mud of fresh or brackish waters | 
| Lifestyle | |
| Pathogenicity | 
| Distribution | 
| Reference | "Pelosigma" | 
| First citation | Lauterborn,R. (1913) Zur Kenntnis einiger sapropelischer Schizomyceten Allg. Bot. Z. 19: 97-100 | 
| The Prokaryotes | p | 
| Bergey's Systematatic | p 138 P. Hirsch | 
| Bergey's Determinative | p 67 | 
| References | Hirsch (1981) |