Regular shells slightly irregular 3-5 microns in diameter, with a tuft of filaments 40 micronsde long. Isolated or in aggregates. Murein absent. Anaerobic, heterotrophic fermenting yeast extract. Optimal growth at 70-95 ° C and pH 6.5-8.5, inhibited by S °. DNA: 54-56 mol% G+ C.A single species, Sulfophobococcus zilligii .
