| Family | Common Name | Selected Genus and Species | Image |
|---|---|---|---|
| Aulolaimidae | Nematode | Aulolaimus mubarakvilli | |
| Axonolaimidae | Nematode | Axonolaimus paraspinosus | |
| Bastianiidae | Nematode | Bastiania sinensis | |
| Haliplectidae | Nematode | Geohaliplectus andrassyi | |
| Isolaimiidae | Nematode | Isolaimium nigeriense | |
| Leptolaimidae | Nematode | Leptolaimus elegans | |
| Plectidae | Nematode | Plectus murrayi | |
| Rhabdolaimidae | Nematode | Syringolaimus smolae | |
| Teratocephalidae | Nematode | Teratocephalus lirellus | |
| Tripyloididae | Nematode | Bathylaimus gracilis | |
| Family | Common Name | Selected Genus and Species | Image |
|---|---|---|---|
| Ceramonematidae | Nematode | Ceramonema inguinispina |  |
| Choniolaimidae | Nematode | Cobbionema acrocerca |  |
| Chromadoridae | Nematode | Atrochromadora naviculatum |  |
| Comesomatidae | Nematode | Vasostoma brevispicula |  |
| Cyatholaimidae | Nematode | Paracanthonchus heterodontus |  |
| Desmodoridae | Nematode | Desmodora minuta |  |
| Draconematidae | Nematode | Megadraconema cornutum |  |
| Epsilonematidae | Nematode | Metepsilonema hagmeieri |  |
| Microlaimidae | Nematode | Microlaimus korari |  |
| Monoposthiidae | Nematode | Monoposthia mirabilis |  |
| Richtersiidae | Nematode | Richtersia argentinae |  |
| Selachinematidae | Nematode | Gammanema magnum |  |
| Xennellidae | Nematode | Xennella suecica |  |
| Family | Common Name | Selected Genus and Species | Image |
|---|---|---|---|
| Desmoscolecidae | Nematode | Desmoscolex falcatus |  |
| Family | Common Name | Selected Genus and Species | Image |
|---|---|---|---|
| Actinolaimidae | Nematode | Neoactinolaimus kosambus |  |
| Alaimidae | Soil-inhabiting Nematode | Alaimus assamens |  |
| Anatonchidae | Predatory Nematode | Miconchus studeri |  |
| Aporcelaimidae | Nematode | Aporcelaimellus cylindricus |  |
| Belondiridae | Plant-feeder Nematode | Belondira tropica |  |
| Campgdoridae | Nematode | Campydora demonstrans |  |
| Carcharolaimidae | Nematode | Carcharolaimus teres |  |
| Cobbonchidae | Nematode | Cobbonchus palustris |  |
| Diphterophoridae | Nematode | Diphtherophora lata |  |
| Dorylaimidae | Nematode | Labronema ibarakiense |  |
| Falcihastidae | Nematode | Falcihasta palustris | |
| Iotonchusidae | Nematode | Iotonchus lotilabiatus |  |
| Leptonchidae | Nematode | Leptonchus granulosus |  |
| Longidoridae | Needle Nematode | longidorus elongatus |  |
| Mononchidae | Nematode | Mononchus truncatus |  |
| Mononchulidae | Nematode | Mononchulus nodicaudatus |  |
| Nygolaimellidae | Freshwater Nematode | Nygolaimellus abnormis |  |
| Nygolaimidae | Freshwater Nematode | Paravulvus moroccanus |  |
| Opailaimidae | Nematode | Opailaimus mirus | |
| Oxydiridae | Nematode | Oxydirus tenuicaudatua |  |
| Qudsianematidae | Nematode | Hulqus zelandicus |  |
| Trachypleurosidae | Nematode | Trachypleurosum indicum |  |
| Tylencholaimellidae | Nematode | Tylencholaimellus masakii |  |
| Tylencholaimidae | Nematode | Meylis dicephalus | |
| Family | Common Name | Selected Genus and Species | Image |
|---|---|---|---|
| Anoplostomatidae | Nematode | Anoplostoma nhatrangensis |  |
| Anticomidae | Nematode | Anticoma subsimilis |  |
| Cryptonchidae | Nematode | Cryptonchus tristis |  |
| Enchelidiidae | Nematode | Belbolla warwicki |  |
| Enoplidae | Nematode | Enoplus meridionalis |  |
| Eurystominidae | Nematode | Eurystomina terricola |  |
| Ironidae | Nematode | Trissonchulus baldwini |  |
| Lauratonematidae | Nematode | Lauratonema macrostoma |  |
| Leptosomatidae | Nematode | Thoracostoma setosum |  |
| Oncholaimidae | Nematode | Oncholaimus paralangrunensis |  |
| Onchulidae | Nematode | Kinonchulus sattleri |  |
| Oxystominidae | Nematode | Halalaimus diacros |  |
| Phanodermatidae | Nematode | Phanoderma ocellatum |  |
| Prismatolaimidae | Nematode | Prismatolaimus intermedius |  |
| Rhabdodemaniidae | Nematode | Rhabdodemania minor |  |
| Symplocostomatidae | Nematode | Symplocostoma tenuicolle |  |
| Thoracostomopsidae | Nematode | Thoracostomopsis carolae |  |
| Trefusiidae | Nematode | Trefusia piperata |  |
| Triodontolaimidae | Nematode | Triodontolaimus acutus |  |
| Tripylidae | Nematode | Tripyla daviesae |  |
| Family | Common Name | Selected Genus and Species | Image |
|---|---|---|---|
| Mermithidae | Grasshopper Nematode | Mermis nigrescens |  |
| Family | Common Name | Selected Genus and Species | Image |
|---|---|---|---|
| Aponchiidae | Nematode | Synonema obtusicaudatum |  |
| Linhomoeidae | Nematode | Linhomoeus undulatus |  |
| Monhysteridae | Nematode | Monhystera stagnalis |  |
| Scaptrellidae | Nematode | Scaptrella cincta | |
| Siphonolaimidae | Nematode | Siphonolaimus japonicus |  |
| Sphaerolaimidae | Nematode | Parasphaerolaimus magdolnae |  |
| Xyalidae | Nematode | Paramphimonhystrella barbula |  |
| Family | Common Name | Selected Genus and Species | Image |
|---|---|---|---|
| Mononchida | Nematode | Coomansus venezolanus |  |
| Family | Common Name | Selected Genus and Species | Image |
|---|---|---|---|
| Cystoopsidae | Nematode | Cystoopsis acipenseri |  |
| Robertdollfusidae | Parasitic Nematode | Haycocknema perplexum |  |
| Trichinellidae | Trichina Worm | Trichinella spiralis |  |
| Trichuridae | Whipworm | Trichuris trichiura |  |
| Family | Common Name | Selected Genus and Species | Image |
|---|---|---|---|
| Diphtherophoridae | Nematode | Longibulbophora ammophilae |  |
| Trichodoridae | Stubby-root Nematode | Trichodorus obtusus |  |