Overview of world wide distributions and type localities of species belonging to the families of Archimonocelidae, Calviriidae, Coelogynoporidae, Meidiamidae, Monocelididae, Monotoplanidae, Otoplanidae, Polystyliphoridae. The data were digitized by VLIZ from the original report: Martens, P.M. (1989). Revisie van de Monocelididae Hofsten, 1907 (Platyhelminthes). PhD Thesis. Rijksuniversteit Gent : Faculteit Wetenschappen: Gent. 2 volumes pp.