Epifluorescence micrograph of a DAPI stained specimen of the anaerobic ciliate Metopus verrucosus. The blue color, from DAPI, shows the three macronuclei of the ciliate as well as transverse bands of rod-shaped ectosymbionts. Surrounding material is from co-occurring microbiota, including filamentous sulfur oxidizing bacteria. Sample from Santa Barbara Basin, CA. Photo by Joan M. Bernhard.