ABSTRACT
The classification of triclads (Platyhelminthes, Tricladida) has improved since modern phylogenetic studies, i.e., Hennigian or cladistic analyses, have been used as the basis for taxonomic revisions. In this respect, attention has been paid mostly to: 1) the relationships between the higher taxa within the Tricladida, the sub- or infraorders of current taxonomy (cf. Sluys 1989a; Carranza et al. 1998a); 2) the affinities within the suborder of the marine triclads or Maricola (Sluys 1989b); and 3) the higher taxon relationships within the freshwater planarians or Paludicola in general and within the family Dugesiidae Ball, 1974 in particular (cf. Ball 1974a; de Vries and Sluys 1991).
