This species is the type species of the genus. The image is of a Lugol's-preserved specimen found in a sample from the BIOSOPE cruise in 2004 to the South Pacific. It has been reported from the South Atlantic, Mediterrean Sea and the South Pacific.
Xystonellopsis dicymatica is a tropical tintiinid ciliate about 350 microns long. The image is of a lugol's preserved specimen ffrom the South East Pacific.