Orthonectida

Orthonectida () is a small phylum of poorly known parasites of marine invertebrates that are among the simplest of multi-cellular organisms. Members of this phylum are known as orthonectids.

Rhopaluridae is a family of worms belonging to the phylum Orthonectida, order and class unknown.

Intoshia is a genus of worms belonging to the family Rhopaluridae.

Ciliocincta is a genus of worms belonging to the family Rhopaluridae.

species of orthonectids

REDIRECT Pelmatosphaera

Pelmatosphaera is a monotypic genus of worms belonging to the monotypic family Pelmatosphaeridae. The only species is Pelmatosphaera polycirri.