What is the digestion of white planaria?

The white planaria feeds on a variety of crustaceans and worms. She has a mouth opening, but no anal. The planaria is characterized by a closed digestive system. Undigested food debris is also removed through a retractable pharynx, which swallows food. Digestion takes place in the intestine, the walls of which have one layer of cells. In a blindly closed intestine, digestive juice acts, it cannot completely digest food. Further nutrients enter the cells. Planaria retained the ability for cellular and extracellular digestion.