Phasmarhabditis hermaphrodita. Coloured scanning electron micrograph (SEM) of Phasmarhabditis hermaphrodita. Phasmarhabditis hermaphrodita is a microscopic nematode in the family Rhabditidae. It is a lethal parasite of the slug. This nematode is commercially reared in a culture with the bacterium Moraxella osloensis and sold as a biological molluscicide for the control of slugs. Magnification: x 80 when printed 10cm wide.