The Nematoda is one of the most abundant phyla within the animal kingdom. It is the most speciose phylum after the Arthropoda. Nematodes are a monophyletic group. They occupy nearly every ecological niche from marine to fresh water, from the Polar Regions to the tropics, as well as from the highest to the lowest of elevations. A total of 26,646 species have been described; of them 8,359 species parasitic in vertebrate hosts, 3,501 species parasitic in invertebrate hosts, 4,105 species parasitic in plants, and 10,681 free-living species. It has been estimated that the total number of nematode species might be approximately 1,000,000.
The species of nematodes reported to be incriminated in human infections
Family Rhabditidae
Rhabditis hominis
Rhabditis inermis
Rhabditis elongata
Rhabditis axei
Rhabditis taurica
Rhabditis terricola
Rhabditis pellio
Rhabditis niellyi
Rhabditis gracilis
Rhabditis usui
Rhabditis macrocerca
Unidentified species of Rhabditis!
Pelodera strongyloides
Pelodera teres
Diploscapter coronata
Cheilobus quadrilabiatus
Family Panagrolaimidae
Halicephalobus gingivalis
Turbatrix aceti
Family Strongyloididae
Strongyloides stercoralis
Strongyloides fuelleborni
Strongyloides kellyi
Strongyloides procyonis
Strongyloides ransomi
Strongyloides papillosus
Strongyloides westeri
Strongyloides canis
Strongyloides felis
Strongyloides cebus
Strongyloides simiae
Strongyloides myopotami
Strongyloides planiceps
Family Ancylostomatidae
Ancylostoma duodenale
Ancylostoma braziliense
Ancylostoma caninum
Ancylostoma ceylanicum
Ancylostoma malayanum
Cyclodontostomum purvisi
Necator americanus
Uncinaria stenocephala
Family Chabertiidae
Oesophagostomum aculeatum
Oesophagostomum bifurcum
Oesophagostomum brumpti
Oesophagostomum stephanostomum
Oesophagostomum dentatum
Ternidens deminutus
Family Syngamidae
Mammomonogamus laryngeus
Family Trichostrongylidae
Haemonchus contortus
Marshallagia marshalli
Ostertagia ostertagi
Teladorsagia circumcincta
Trichostrongylus orientalis
Trichostrongylus colubriformis
Trichostrongylus axei
Trichostrongylus vitrinus
Trichostrongylus probolurus
Trichostrongylus skrjabini
Trichostrongylus capricola
Trichostrongylus lerouxi
Trichostrongylus brevis
Trichostrongylus calcaratus
Trichostrongylus affinis
Family Metastrongylidae
Metastrongylus elongatus
Family Angiostrongylidae
Parastrongylus cantonensis
Parastrongylus costaricensis
Family Oxyuridae
Enterobius vermicularis
Enterobius gregorii
Syphacia obvelata
Family Anisakidae
Anisakis physeteris
Anisakis simplex
Contracaecum osculatum
Phocanema decipiens
Family Raphidascaridae
Hysterothylacium aduncum
Family Ascarididae
Ascaris lumbricoides
Ascaris suum
Baylisascaris procyonis
Lagochilascaris minor
Parascaris equorum
Toxocara canis
Toxocara cati
Family Dracunculidae
Dracunculus medinensis
Family Gnathostomatidae
Gnathostoma binucleatum
Gnathostoma doloresi
Gnathostoma hispidum
Gnathostoma nipponicum
Gnathostoma spinigerum
Family Physalopteridae
Physaloptera caucasica
Physaloptera transfuga
Family Rictulariidae
Rictularia sp.
Family Thelaziidae
Thelazia californiensis
Thelazia callipaeda
Family Gongylonematidae
Gongylonema pulchrum
Family Spirocercidae
Spirocerca lupi
Family Acuariidae
Cheilospirura sp.
Family Onchocercidae
Brugia beaveri
Brugia sp. (cf. B.ceylonensis)
Brugia guyanensis
Brugia malayi
Brugia pahangi
Brugia timori
Brugia sp. (cf. B.tupaiae)
Dipetalonema sp. (cf. D.arbuta/D.sprenti)
Dirofilaria immitis
Dirofilaria repens
Dirofilaria striata
Dirofilaria tenuis
Dirofilaria ursi
Loa loa
Loaina sp.
Mansonella ozzardi
Mansonella perstans
Mansonella rodhaini
Mansonella streptocerca
Meningonema peruzzii
‘Microfilaria’ bolivarensis
‘Microfilaria’ semiclarum
Onchocerca sp. (cf. O.gutturosa)
Onchocerca volvulus
Setaria equina
Wuchereria bancrofti
Family Dioctophymatidae
Dioctophyme renale
Eustrongylides sp.
Family Trichinellidae
Trichinella britovi
Trichinella murrelli
Trichinella nativa
Trichinella nelsoni
Trichinella pseudospiralis
Trichinella spiralis
Family Trichuridae
Anatrichosoma cutaneum
Calodium hepaticum
Eucoleus aerophilus
Paracapillaria philippinensis
Trichuris suis
Trichuris trichiura
Trichuris vulpis
Family Muspiceoidea
Some worms of genera and species unidentified!