P. campylostylus Karling, 1947 1947 Fig. 10C Semi-schematic drawing of a vertical section through the pharynx, one side depicted; camera lucida, Magn. 670X
from Karling TG (1947) Studien ueber Kalyptorhynchien (Turbellaria). I. Die Familien Placorhynchidae und Gnathorhynchidae. Acta zool fenn 50:1-64