Wikipedia
Dolichomacrostomidae
The Dolichomacrostomidae are a family of small basal free-living flatworms ( Macrostomida, Turbellaria, Platyhelminthes), and members of the marine, but also brackish, meiobenthos. The name was coined by Reinhard M. Rieger (1971), who designated the Dolichomacrostomidae as a family within the taxon Macrostomida. There are currently about 40 named species in this family.