Noun
An extensive group of worms which have the body covered externally with vibrating cilia. It includes the Rhabdoc/la and Dendroc/la. Formerly, the nemerteans were also included in this group.
Source: Webster's dictionaryMajor subgroups Early classification divided the flatworms into four groups: Turbellaria, Trematoda, Monogenea and Cestoda. Source: Internet
Turbellaria main The turbellarian Pseudoceros dimidiatus These have about 4,500 species, are mostly free-living, and range from convert to convert in length. Source: Internet