title: Intestinal opalinids from amphibia in Saudi Arabia.
mesh_terms: D000818:Animals; D002025:Bufonidae / Q000469:parasitology*; D016798:Ciliophora / Q000302:isolation & purification*; D007422:Intestines / Q000469:parasitology; D011895:Rana ridibunda / Q000469:parasitology*; D011898:Ranidae / Q000469:parasitology*; D012529:Saudi Arabia