Digestive tract. The digestive tracts of P. canaliculata, composed of esophagus, intestine, stomach, and rectum, were lined by a ciliated columnar epithelium consisting of columnar cells and mucous-secreting goblet cells
Digestive tract. The digestive tracts of P. canaliculata,composed of esophagus, intestine, stomach, and rectum, were linedby a ciliated columnar epithelium consisting of columnar cells andmucous-secreting goblet cells