Monotypic flatworm genera

Gastrodiscoides is genus of zoonotic trematode under the class Trematoda. It has only one species, Gastrodiscoides hominis. It is a parasite of a variety of vertebrates, including humans. The first definitive specimen was described from a human subject in 1876. It is prevalent in Bangladesh, India, Burma, China, Kazakhstan, Philippines, Thailand, Vietnam, and the Volga Delta of Russia, with isolated cases from Africa, such as Nigeria. It is especially notable in the Assam, Bengal, Bihar, Madhya Pradesh, Odisha and Uttar Pradesh states of India.

Archigyrodactylus is a genus of monogeneans in the family Gyrodactylidae. It consists of one species, Archigyrodactylus archigyrodactylus Mizelle & Kritsky, 1967.

Neohelicometra is a genus of trematodes in the family Opecoelidae. It consists of only one species, Neohelicometra scorpaenae.

Gandalfia is a monotypic genus of flatworms belonging to the family Trigonostomidae. The only species is Gandalfia bilunata.

Bothrioplana is a genus of freshwater flatworms, the sole genus in the family Bothrioplanidae and order Bothrioplanida.

Leucochloridiomorpha is a genus of parasitic trematode in the order Diplostomida. It is the only member of the family Leucochloridiomorphidae, and is monotypic, containing the sole species Leucochloridiomorpha constantiae.