Paragordius tricuspidatus

Paragordius tricuspidatus belongs to the phylum Nematomorpha, and is known for manipulating the behavior of its host, the cricket Nemobius sylvestris. In its larval stage, the worm is microscopic, but grows into a large worm (10–15 cm or 3.9–5.9 in) inside its host after accidental ingestion since their eggs are laid at the edge of the water by rivers where crickets frequently reside. Upon ingestion, the worm nourishes upon its host and fills the entire body cavity of...