List of parasitic organisms

This is an incomplete list of organisms that are true parasites upon other organisms.

Endoparasites

(endo = within; parasites that live inside their hosts)

These can be categorized into three groups; cestodes, nematodes and trematodes. Examples include:

Acanthocephala
Ascariasis (roundworms)
Cestoda (tapeworms) including: Taenia saginata (human beef tapeworm), Taenia solium (human pork tapeworm), Diphyllobothrium latum (fish tapeworm) and Echinococcosis (hydatid tapeworm)
Clonorchis sinensis (the Chinese liver fluke)
Dracunculus medinensis (Guinea worm)
Enterobius vermicularis (pinworm)
Filariasis
Hookworm
Loa loa
Onchocerciasis (river blindness)
Schistosomiasis
Strongyloides stercoralis
Tapeworm
Toxocara canis (dog roundworm)
Trichinella
Whipworm

Entamoeba histolytica and Entamoeba coli - can cause Amoebiasis
Acanthamoeba
Balamuthia mandrillaris
Giardia
Cyclospora cayetanensis
Cryptosporidium
Toxoplasma gondii
Leishmania - L. tropica, L. donovani, and L. mexicana are known to cause Leishmaniasis.
Plasmodium - causes the fatal disease, Malaria. P. falciparum, P. vivax, and P. malariae are pathogenic to humans.
Babesia

(ecto = outside; parasites that live on but not within their hosts, for example, attached to their skin)

Acari
- Varroa destructor
Cymothoa exigua
Bed bugs
Culicidae (mosquitoes)
Calyptra (moth) (vampire moths)
Hippoboscoidea
- Tsetse fly
- Lipoptena
- Melophagus ovinus, (sheep keds) and relatives
Oestridae (bot flies)
- Human botfly
- Cuterebra fontinella (mouse botfly)
Phlebotominae (sand flies)
Phthiraptera (Lice)
Siphonaptera (fleas)
Tabanidae (horse flies)
Tantulocarida
Triatominae
Pea crab
Sacculina

Monogeneans are flatworms, generally ectoparasites on fish.