Blepharisma japonicum is a species of protozoan that can be found either in water or soil[1] in Japan.

It has a cytostome which is a two-layered undulating membrane, on the right front edge, and also contractile vacuole with cytopyge terminal.

[2] Blepharisma japonicum produces sexual pheromones that promote conjugation.

When sexually mature mating-type I cells are moderately starved, they autonomously produce and secrete gamone I.

Sexual reproduction involving interaction of opposite mating types promotes outcrossing and the masking of deleterious recessive mutations in the diploid stage of the sexual life cycle.