 This feature is not present in other triclads.Another feature shared with "Neppia" is the presence of a glandular area at the transicional area between the seminal vesicle and the ejaculatory duct, although in "Dugesia" these glands are concentrated at the diaphragm, a structure not present in any other genera.Ball proposed that the presence of this glands was a synapomorphy of "Dugesia" and "Neppia".