<unk>  is the only parasite of the genus<unk>  capable of infecting humans.<unk>  infections are due to humans acting as accidental hosts for the parasite. There are seven genera of spirudia nematodes that infect human hosts accidentally: Gnathostoma, Thelazia,<unk> , Physaloptera, Spirocerca, Rictularia. The G.<unk>  parasite is a nematode worm of the order Spirurida. It is a relatively thin nematode, and like other worms within its class, it has no circulatory or respiratory system. Most other<unk>  species infect birds and mammals: there are 25 species found in mammals and 10 species found in birds. This parasite is multi-cellular, and capable of movement. They have numerous rear mucosal projections, which assumedly assist propulsion through the thin layer of skin on the inside of the human host's mouth. They also have an excretory system possessing lateral canals. This parasite eats epithelial cells. Also, very often the canals are a place of inflammation, with accumulation of exudates in them.<unk>  also swallows these exudates.
Gongylonema pulchrum
Antihecticum poterii
Craniopagus parasiticus
Baylisascaris procyonis
Trichobacteriosis axillaris
Haycocknema perplexum
Myriodontium keratinophilum
Toxocara cati