Tube-like pharynx of common triclad planarian Dugesia can be protruded through the mouth opening and be used to suck food into the gut. The certain-like pharynx of many polyclads can be protruded through the mouth and be used to enwrap their crustacean prey. This is an example of which of the following Pharynx simplex Pharynx plicatus Pharynx Bulbosus A simple mouth opening.