Bacterial Phylum Bacteroidota

The phylum Bacteroidota includes Gram-negative rods classified into four orders - Bacteroidales, Cytophagales, Flavobacteriales, and Sphingobacteriales.

The order Bacteroidales primarily comprises obligately anaerobic, fermentative bacteria.

Notably, the genus Bacteroides constitutes a significant portion of the microbial biomass in the human large intestine.

The order Cytophagales primarily includes obligate aerobes that are typically long, slender rods, often with pointed ends.

Cytophaga is a key genus of Cytophagales, capable of degrading cellulose, agar, and chitin.

The order Flavobacteriales includes the widespread genus Flavobacterium and the genera Polaribacter and Psychroflexus, which thrive in polar waters and sea ice.

The order Sphingobacteriales is a diverse group commonly found in soil and freshwater environments. Sphingobacterium is the representative genus.

Sphingobacterium species are nonmotile rods without flagella. Additionally, many species within the genus Sphingobacterium appear pigmented as they possess carotenoids in their cell walls.