Gnathostomulid is a small class microscopic of marine worms. They generally live amongst the sand of muddy ocean seabeds. They are similar to flatworms in that they have ciliated epidermis, are symmetrical along the midline, and lack an internal body cavity. Their most distinguishing feature is their pair of toothed jaws, in which they use to feed on fungi and other small organisms. Even though Gnathostomulids are hermaphroditic, possessing both egg and sperm, they cannot fertilize themselves. Approximately 80-100 species of Gnathostomulid have been currently found.