Spirurina (spirurine nematodes)

Mainly obligate parasites of vertebrates, including fish, reptiles (including birds) and mammals.

Anguillicoloidea

One family: Anguillicolidae.

Dracunculoidea

Gnathostomatomorpha

One family: Gnathostomatidae.

Oxyuridomorpha

Rhigonematomorpha

Spiruromorpha

Ascaridomorpha

Includes Ascaris lumbricoides, parasitic on humans.

Myolaimina

One family Myolaimidae, with four genera: Daubaylia (parasites of molluscs, such as Planorbis freshwater snails, and annelids), Deleyia, Myolaimus and Poikilolaimus.

Tylenchina

Panagrolaimomorpha

Five families: Panagrolaimidae, Alloionematidae, Rhabdiasidae, Steinernematidae, Strongyloididae

Cephalobomorpha

Five families: Cephalobidae, Elaphonematidae, Osstellidae, Alirhabditidae and Bicirronematidae, Metacrobelidae

Tylenchomorpha

Drilonematomorpha

Six families: Creagrocercidae, Drilonematidae, Homungellidae, Mesidionematidae, Scolecophilidae and Ungellidae.

Rhabditina

Bunonematomorpha

Two familes: Bunonematidae (genera: Aspidonema, Bunonema, Craspedonema, Rhodolaimus, Rhodonema, Sachsium, Stammeria) and Pterygorhabditidae (one genus: Pterygorhabditis). Bunonema species are free-living in soil, decaying vegetable matter, cow dung or rotting wood, and eat bacteria.

Diplogasteromorpha

One family: Diplogasteridae, containing 35 genera. Parasites of insects. Parasitodiplogaster parasitises agaonid fig wasps.

Rhabditomorpha

Includes family Rhabditidae.

Uncertain position

Families: Teratocephalidae (genera Steratocephalus, Teratocephalus), Chambersiellidae (genera Chambersiella, Cornilaimus, Fescia, Geraldius, Trualaimus, Diastolaimus, Macrolaimus) and Brevibuccidae (genera Brevibucca and Cuticonema).