Fastidiosibacteraceae Francisellaceae Piscirickettsiaceae Thiofilaceae Thiolinaceae Thiotrichaceae Thiotrichales is an order of sulfur-oxidizing bacteria within the class Gammaproteobacteria known for their large size and ability to live in sulfur rich environments.

Thiotrichales has an important role in the sulfur and nitrogen cycles in marine and freshwater sediments, hydrothermal vents, and areas with an accumulation of organic matter.

These bacteria thrive when there is a gradient between oxygenated and anoxic zones, that can occur around hydrothermal vents.

They can form symbiotic relationships with other organisms, mostly marine invertebrates like mussels and worms.

Through sulfur oxidation, Thiotricales effectively detoxify sulfide in marine and freshwater sediments, hydrothermal vents, and areas with large accumulations of organic matter making the regions more hospitable to other organisms.