@inbook {5406, title = {Relationships and phylogeny of the Turbellaria.}, booktitle = {The Lower Metazoa.}, year = {1963}, month = {1963}, pages = {191 - 224}, keywords = {Hofstenia atroviridis, Hofstenia giselae, Hofstenia miamia, Hofstenia viridis}, author = {Ax,P}, editor = {Dougherty,EC} }