"Hedruris spinigera is a parasite belong to phylum Nematoda, commonly found in the stomach of freshwater fish. The female Hedruris spinigera attaches itself onto the epithelium of the fishes' stomach using a hook at the curved tail. Meanwhile, the male swims freely until it finds a female that has already attached to a host, then the male curls around the body of that female so that sexual reproduction occurs within the host."@en . . . . . "Hedruris spinigera"@en . . .