Animals 10 pharynx 10 Argentina 8 article 8 nonhuman 8 Chickens 6 Trematode Infections 6 animal 6 metacercaria 6 Biomphalaria 4 Buenos Aires [Argentina] 4 Fish Diseases 4 Gastropoda 4 Gills 4 Life Cycle Stages 4 Microscopy, Electron, Scanning 4 Pharynx 4 Trematoda 4 Venezuela 4 adult 4 bird disease 4 chicken 4 classification 4 controlled study 4 flatworm 4 gill 4 histology 4 isolation and purification 4 life cycle 4 morphology 4