title: Comparative fine structure and origin of the metacercarial cyst in two philophthalmid trematodes, Parorchis acanthus (Nicoll, 1906) and Philophthalmus megalurus (Cort, 1914).
mesh_terms: D000818:Animals; D008854:Microscopy, Electron; D014200:Trematoda / Q000166:cytology*