according to the wiki article, they did not know how to classify the b hominis, they thought it should be classified as (read below)
Wiki says::
Blastocystis is a genus of single-celled protozoan parasites belonging to a group of organisms known as the Stramenopiles (also called Heterokonts) that includes algae, diatoms, and water molds. Blastocystis comprises several species, living in the gastrointestinal tracts of species as diverse as humans, farm animals, birds, rodents, reptiles, amphibians, fish, and cockroaches.[1] The species residing in humans is known as Blastocystis hominis and is the focus of this article.