Occurrence of Chaetogaster limnaei limnaei (Oligachaeta) in the gastropod snail Lymnaea philipinensis Nevill in Metro Manila and its possible role in the control of fascioliasis

agentes nocivos animal animal aquatique animal nuisible animales animales nocivos animals annelida aquatic animals aquatic organisms asia asie control de plagas earthworms escargot facteur nuisible fasciola filipinas helminthe helminths helmintos injurious factors invertebrados invertebrates lombric lombriz de tierra molluscs mollusque moluscos noxious animals organisme aquatique organisme nuisible pest control pests philippines plagas plathelminthe platyhelminthes snails trematode trematodes trematodos