Adiaphanida
Trepaxonemata
Subclass of flatworms
Trepaxonemata (from trepa-, spiral + axoneme) is a subclass of the Platyhelminthes or flatworms.[1] It includes all parasitic flatworms (clade Neodermata) and several free-living species that were previously grouped in the now obsolete class Turbellaria. Therefore, it contains the majority of species in the phylum Platyhelminthes, excluding the Catenulida, and the Macrostomorpha.