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| Sabanema | Heligmonellidae | animal parasites | ||||
| Sabatieria | Comesomatidae | marine nematodes | G586mnu.htm | |||
| Sacrimarinema | Xyalidae | freshwater nematodes | G3891mnu.htm | |||
| Sadkonavis | Leptosomatidae | marine nematodes | ||||
| Saevadorella | Nordiidae | omnivores | 4 | 8 | o4 | G7134mnu.htm | 
| Safianema | Anguinidae | plant feeders | 2 | 1 | h2 | G126mnu.htm | 
| Sahaynema | Trichostrongylidae | animal parasites | ||||
| Sakia | Tylenchidae | plant feeders | 2 | 1 | h2 | G118mnu.htm | 
| Salesia | Hystrignathidae | animal parasites | ||||
| Salimella | Qudsianematidae | predators | 4 | 5 | p4 | G7263mnu.htm | 
| Santafea | Chambersiellidae | bacteria feeders | 2 | 3 | b2 | G912mnu.htm | 
| Saprorhabditis | Rhabditidae | bacteria feeders | 1 | 3 | b1 | G2232mnu.htm | 
| Sarconema | Onchocercidae | animal parasites | ||||
| Sarisodera | Heteroderidae | plant feeders | 3 | 1 | h3 | G119mnu.htm | 
| Sarsonia | Linhomoeidae | marine nematodes | ||||
| Sarwaria | Haemonchidae | animal parasites | ||||
| Sauertylenchus | Telotylenchidae | plant feeders | 3 | 1 | h3 | G120mnu.htm | 
| Sauricola | Strongylidae | animal parasites | ||||
| Saveljevia | Thoracostomopsidae | marine predators | ||||
| Scalpelus | Dorylaimidae | omnivores | 4 | 8 | o4 | G7301mnu.htm | 
| Scalpenchus | Leptonchidae | fungus feeders | 4 | 2 | f4 | G7826mnu.htm | 
| Scapidens | Aporcelaimidae | omnivores | 5 | 8 | o5 | G768mnu.htm | 
| Scaptrella | Xyalidae | marine nematodes | G3892mnu.htm | |||
| Scatonema | Allantonematidae | animal parasites | ||||
| Schistonchus | Aphelenchoididae | plant feeders | 2 | 1 | h2 | G220mnu.htm | 
| Schiurodendrium | Heligmonellidae | animal parasites | ||||
| Schneidernema | Schneidernematidae | animal parasites | ||||
| Schrankiana | Atractidae | animal parasites | G8661mnu.htm | |||
| Schulmanela | Capillariidae | animal parasites | ||||
| Schulzia | Molineidae | animal parasites | ||||
| Schulzinema | Chabertiidae | animal parasites | ||||
| Schwenkiella | Thelastomatidae | animal parasites | G9756mnu.htm | |||
| Sciuricola | Heligmonellidae | animal parasites | ||||
| Sciurodendrium | Heligmonellidae | animal parasites | G36313mnu.htm | |||
| Scleralaimus | Amphidelidae | bacteria feeders | 4 | 3 | b4 | |
| Scleramphidelus | Amphidelidae | bacteria feeders | 4 | 3 | b4 | G635mnu.htm | 
| Scleroactinolaimus | Actinolaimidae | omnivores | 5 | 8 | o5 | G7614mnu.htm | 
| Sclerodorylaimus | Dorylaimidae | omnivores | 5 | 8 | o5 | G7031mnu.htm | 
| Sclerolabia | Thornenematidae | omnivores | 5 | 8 | o5 | G7086mnu.htm | 
| Sclerolaimus | Leptonchidae | fungus feeders | 4 | 2 | f4 | G7846mnu.htm | 
| Sclerorhabditis | Rhabditidae | bacteria feeders | 1 | 3 | b1 | G2224mnu.htm | 
| Sclerostylus | Leptonchidae | fungus feeders | 4 | 2 | f4 | G7793mnu.htm | 
| Scolpaniella | Comesomatidae | marine nematodes | ||||
| Scottnema | Cephalobidae | bacteria feeders | 2 | 3 | b2 | G2615mnu.htm | 
| Scutellonema | Hoplolaimidae | plant feeders | 3 | 1 | h3 | G121mnu.htm | 
| Scutylenchus | Merliniidae | plant feeders | 3 | 1 | h3 | G166mnu.htm | 
| Sectonema | Aporcelaimidae | omnivores | 5 | 8 | o5 | G736mnu.htm | 
| Seinura | Aphelenchoididae | predators | 2 | 5 | p2 | G216mnu.htm | 
| Seleborca | Cephalobidae | bacteria feeders | 2 | 3 | b2 | G2616mnu.htm | 
| Semitobrilus | Tobrilidae | predators | 3 | 5 | p3 | G604mnu.htm | 
| Senegalonema | Hoplolaimidae | plant feeders | 3 | 1 | h3 | G122mnu.htm | 
| Serpentirhabdias | Rhabdiasidae | animal parasites | ||||
| Serpinema | Camallanidae | animal parasites | G7975mnu.htm | |||
| Setaria | Onchocercidae | animal parasites | G9871mnu.htm | |||
| Setoplectus | Haliplectidae | marine nematodes | G4271mnu.htm | |||
| Setosabatieria | Comesomatidae | marine nematodes | ||||
| Setostephanolaimus | Camacolaimidae | marine nematodes | G4327mnu.htm | |||
| Setsalia | Tobrilidae | predators | 3 | 5 | p3 | |
| Seuratascaris | Ascarididae | animal parasite | ||||
| Seuratum | Seuratidae | animal parasites | ||||
| Severianoia | Thelastomatidae | animal parasites | G9755mnu.htm | |||
| Shattukius | Molineidae | animal parasites | ||||
| Sheraphelenchus | Aphelenchoididae | fungus feeders | 2 | 2 | f2 | G219mnu.htm | 
| Shikhobalovia | Trichostrongylidae | animal parasites | ||||
| Sibayinema | Desmodoridae | marine nematodes | ||||
| Sicaguttur | Thornenematidae | omnivores | 5 | 8 | o5 | G707mnu.htm | 
| Sicarius | Habronematidae | animal parasites | ||||
| Siconema | Ungellidae | animal parasites | G1851mnu.htm | |||
| Siconemoides | Ungellidae | animal parasites | ||||
| Sicorinema | Crateronematidae | omnivores | 4 | 8 | o4 | G742mnu.htm | 
| Sicorinemella | Crateronematidae | omnivores | 4 | 8 | o4 | G7423mnu.htm | 
| Siddiqia | Longidoridae | plant feeders | 5 | 1 | h5 | G0951mnu.htm | 
| Sigmaphoronema | Desmodoridae | marine nematodes | ||||
| Sigmolenchus | Tylenchidae | plant feeders | 2 | 1 | h2 | G1683mnu.htm | 
| Silenchus | Tylenchidae | plant feeders | 2 | 1 | h2 | G1031mnu.htm | 
| Silvallis | Aporcelaimidae | omnivores | 5 | 8 | o5 | G7381mnu.htm | 
| Simpliconema | Simpliconematidae | marine nematodes | ||||
| Sinanema | Monhysteridae | marine nematodes | ||||
| Sinoichthyonema | Skrjabillanidae | animal parasites | ||||
| Sinospinata | Hystrignathidae | animal parasites | G9743mnu.htm | |||
| Siphonolaimus | Siphonolaimidae | marine nematodes | G405mnu.htm | |||
| Sitadevinema | Monhysteridae | marine nematodes | ||||
| Skarbilovinema | Iotonchiidae | animal parasites | G184mnu.htm | |||
| Skibbenema | Dorylaimidae | omnivores | 4 | 8 | o4 | G7302mnu.htm | 
| Skrjabillanus | Skrjabillanidae | animal parasites | G9416mnu.htm | |||
| Skrjabinalius | Pseudaliidae | animal parasites | G934mnu.htm | |||
| Skrjabinelazia | Seuratidae | animal parasites | ||||
| Skrjabinema | Oxyuridae | animal parasites | ||||
| Skrjabingylus | Skrjabingylidae | animal parasites | G965mnu.htm | |||
| Skrjabinisakis | Anisakidae | animal parasites | G9101mnu.htm | |||
| Skrjabinocaulus | Protosrongylidae | animal parasites | ||||
| Skrjabinocercella | Desmidocercidae | animal parasites | ||||
| Skrjabinodentus | Strongylidae | animal parasites | G9785mnu.htm | |||
| Skrjabinodon | Pharyngodonidae | animal parasites | ||||
| Skrjabinura | Seuratidae | animal parasites | ||||
| Smithsoninema | Camacolaimidae | marine nematodes | G4351mnu.htm | |||
| Soaresnema | Hystrignathidae | animal parasites | ||||
| Sobolevingylus | Angiostrongylidae | animal parasites | ||||
| Soboliphyme | Soboliphymatidae | animal parasites | G9565mnu.htm | |||
| Solenolaimus | Siphonolaimidae | marine nematodes | ||||
| Solididens | Nygolaimidae | predators | 5 | 5 | p5 | G6783mnu.htm | 
| Southernia | Aegialoalaimidae | marine nematodes | ||||
| Southerniella | Diplopeltidae | marine nematodes | G4492mnu.htm | |||
| Spalacina | Heligmonellidae | animal parasites | ||||
| Spauligodon | Pharyngodonidae | animal parasites | G9962mnu.htm | |||
| Spectatus | Kathlaniidae | animal parasites | ||||
| Sphaeroamphis | Thorniidae | omnivores | 4 | 8 | o4 | G7112mnu.htm | 
| Sphaerocephalum | Linhomoeidae | marine nematodes | ||||
| Sphaerolaimus | Sphaerolaimidae | marine predators | 3 | 5 | p3 | G391mnu.htm | 
| Sphaeronema | Tylenchulidae | plant feeders | 3 | 1 | h3 | G123mnu.htm | 
| Sphaerotheristus | Xyalidae | marine nematodes | G38325mnu.htm | |||
| Sphaerularia | Sphaerulariidae | insect associate | 3 | 7 | d3 | G396mnu.htm | 
| Spiculimermis | Mermithidae | animal parasites | ||||
| Spiculocaulus | Protosrongylidae | animal parasites | G9322mnu.htm | |||
| Spiculopteragia | Haemonchidae | animal parasites | ||||
| Spilophorella | Chromadoridae | marine nematodes | 3 | 3 | b3 | |
| Spilotylenchus | Parasitylenchidae | animal parasites | G3952mnu.htm | |||
| Spimtectus | Hedruridae | animal parasites | ||||
| Spinicauda | Heterakidae | animal parasites | ||||
| Spinitectus | Cystidicolidae | animal parasites | G953mnu.htm | |||
| Spinocephalus | Cephalobidae | bacteria feeders | 2 | 3 | b2 | G2673mnu.htm | 
| Spinodesmoscolex | Desmoscolecidae | marine nematodes | ||||
| Spinodiplotriaena | Diplotriaenidae | animal parasites | ||||
| Spinostrongylus | Molineidae | animal parasites | ||||
| Spiramphinema | Xyalidae | marine nematodes | G38326mnu.htm | |||
| Spirina | Linhomoeidae | marine nematodes | ||||
| Spirinia | Desmodoridae | marine nematodes | G5325mnu.htm | |||
| Spirobakerus | Spirocercidae | animal parasites | ||||
| Spirobolbolaimus | Microlaimidae | marine nematodes | ||||
| 
		 Spirocamallanoides  | 
		Camallanidae | animal parasites | ||||
| Spirocamallanus | Camallanidae | animal parasites | G7976mnu.htm | |||
| Spirocerca | Thelaziidae | animal parasites | G9904mnu.htm | |||
| Spirodesma | Desmodoridae | marine nematodes | G5322mnu.htm | |||
| Spironoura | Kathlaniidae | animal parasites | ||||
| Spirophilometra | Philometridae | animal parasites | ||||
| Spirostrongylus | Chabertiidae | animal parasites | ||||
| Spiroxys | Gnathostomatidae | animal parasites | G9473mnu.htm | |||
| Spirura | Spiruridae | animal parasites | G9901mnu.htm | |||
| Sporonchulus | Mylonchulidae | predators | 4 | 5 | p4 | G6581mnu.htm | 
| Spratellus | Mackerrastrongylidae | animal parasites | ||||
| Sprentia | Hystrignathidae | animal parasites | ||||
| Squamofilaria | Aproctidae | animal parasites | ||||
| Squanema | Desmodoridae | marine nematodes | ||||
| Srivastavanema | Heligmonellidae | animal parasites | G3636mnu.htm | |||
| Stauratostoma | Thelastomatidae | animal parasites | ||||
| Stefanskostrongylus | Angiostrongylidae | animal parasites | ||||
| Stegelleta | Cephalobidae | bacteria feeders | 2 | 3 | b2 | G2671mnu.htm | 
| Stegelletina | Cephalobidae | bacteria feeders | 2 | 3 | b2 | G2672mnu.htm | 
| Stegorhabditis | Rhabditidae | bacteria feeders | 1 | 3 | b1 | G2283mnu.htm | 
| Steineria | Xyalidae | marine nematodes | G3894mnu.htm | |||
| Steinernema | Steinernematidae | bacteria feeders | 2 | 3 | b2 | G832mnu.htm | 
| Steinertetanonema | Tetanonematidae | animal parasites | ||||
| Stelmioides | Cucullanidae | animal parasites | ||||
| Stenodorylaimus | Nordiidae | omnivores | 4 | 8 | o4 | G7152mnu.htm | 
| Stenonchulus | Onchulidae | predators | 3 | 5 | p3 | G611mnu.htm | 
| Stenuroides | Pseudaliidae | animal parasites | ||||
| Stenurus | Pseudaliidae | animal parasites | ||||
| Stephanium | Mononchulidae | predators | 4 | 8 | o4 | G7971mnu.htm | 
| Stephanofilaria | Filariidae | animal parasites | ||||
| Stephanolaimus | Camacolaimidae | marine nematodes | G4323mnu.htm | |||
| Stephanurus | Syngamidae | animal parasites | G9671mnu.htm | |||
| Steratocephalus | Teratocephalidae | bacteria feeders | 3 | 3 | b3 | |
| Stictylus | Neotylenchidae | fungus feeders | 2 | 2 | f2 | G1482mnu.htm | 
| Stilbonema | Desmodoridae | marine nematodes | G537mnu.htm | |||
| Stilestrongylus | Heligmonellidae | animal parasites | ||||
| Stomacholaimus | Qudsianematidae | predators | 4 | 5 | p4 | G7411mnu.htm | 
| Stomachorhabditis | Rhabditidae | bacteria feeders | 1 | 3 | b1 | G2284mnu.htm | 
| Stopractinca | Actinolaimidae | omnivores | 5 | 8 | o5 | G7615mnu.htm | 
| Storobogotovia | Enoplidae | marine nematodes | ||||
| Strelkovimermis | Mermithidae | animal parasites | ||||
| Strongylacantha | Strongylacanthidae | animal parasites | ||||
| Strongyloides | Strongyloididae | animal parasites | G233mnu.htm | |||
| Strongyluris | Heterakidae | animal parasites | ||||
| Strongylus | Strongylidae | animal parasites | G979mnu.htm | |||
| Stygodesmodora | Desmodoridae | marine nematodes | ||||
| Stylotheristus | Xyalidae | marine nematodes | G3822mnu.htm | |||
| Subanguina | Anguinidae | plant feeders | 2 | 1 | h2 | G124mnu.htm | 
| Subsphaerolaimus | Sphaerolaimidae | marine nematodes | G43913mnu.htm | |||
| Subulura | Subuluridae | animal parasites | ||||
| Sucamphida | Ungellidae | animal parasites | ||||
| Sudhausia | Diplogastridae | bacteria feeders | 1 | 3 | b1 | G3262mnu.htm | 
| Suifilaria | Filariidae | animal parasites | ||||
| Suifunema | Thelastomatidae | animal parasites | G9753mnu.htm | |||
| Sulcascaris | Anisakidae | animal parasites | ||||
| Sulphuritylenchus | Allantonematidae | animal parasites | ||||
| Suncinema | Heligmosomidae | animal parasites | G3602mnu.htm | |||
| Sutarostrongylus | Herpetostrongylidae | animal parasites | ||||
| Suttonema | Heligmonellidae | animal parasites | ||||
| Swangeria | Belondiridae | plant feeders | 5 | 1 | h5 | G755mnu.htm | 
| Sychnotylenchus | Anguinidae | plant feeders | 2 | 2 | f2 | G125mnu.htm | 
| Symplocostoma | Enchelidiidae | marine nematodes | ||||
| Symplocostomella | Enchelidiidae | marine nematodes | ||||
| Syncheilaxonchium | Belondiridae | plant feeders | 5 | 1 | h5 | G7511mnu.htm | 
| Syncuaria | Acuariidae | animal parasites | G9481mnu.htm | |||
| Syngamus | Syngamidae | animal parasites | G9672mnu.htm | |||
| Synhimantus | Acuariidae | animal parasites | G948mnu.htm | |||
| Synodontisia | Pharyngodonidae | animal parasites | ||||
| Synodontium | Axonolaimidae | marine nematodes | ||||
| Synodontoides | Axonolaimidae | marine nematodes | ||||
| Synoecnema | Ungellidae | animal parasites | G185mnu.htm | |||
| Synonchiella | Selachinematidae | marine nematodes | G4912mnu.htm | |||
| Synonchium | Selachinematidae | marine nematodes | ||||
| Synonchoides | Leptosomatidae | marine nematodes | ||||
| Synonchus | Leptosomatidae | marine nematodes | G5902mnu.htm | |||
| Synonema | Aponchiidae | marine nematodes | ||||
| Syphabulea | Oxyuridae | animal parasites | ||||
| Syphacia | Oxyuridae | animal parasites | G9961mnu.htm | |||
| Syphaciella | Heteroxynematidae | animal parasites | ||||
| Sypharista | Oxyuridae | animal parasites | ||||
| Syringolaimus | Ironidae | marine/fw nematodes | ||||
| Syringonomus | Leptosomatidae | marine nematodes | ||||
| Tachygonetria | Pharyngodonidae | animal parasites | G9952mnu.htm | |||
| Tachynema | Mackerrastrongylidae | animal parasites | ||||
| Tadaridanema | Molineidae | animal parasites | G3572mnu.htm | |||
| Talanema | Qudsianematidae | omnivores | 4 | 8 | o4 | G7412mnu.htm | 
| Tanqua | Gnathostomatidae | animal parasites | G9472mnu.htm | |||
| Tantunema | Tylencholaimidae | fungus feeders | 4 | 2 | f4 | G796mnu.htm | 
| Tanzanius | Tylenchidae | plant feeders | 2 | 1 | h2 | G1032mnu.htm | 
| Tapia | Leptosomatidae | marine nematodes | ||||
| Tapironema | Cooperiidae | animal parasites | ||||
| Tarantobelus | Brevibuccidae | bacteria feeders | 1 | 3 | b1 | G300mnu.htm | 
| Tarvaia | Tarviidae | marine nematodes | ||||
| Tasmanema | Mackerrastrongylidae | animal parasites | ||||
| Teladorsagia | Haemonchidae | animal parasites | G9644mnu.htm | |||
| Telotylenchus | Telotylenchidae | plant feeders | 3 | 1 | h3 | G174mnu.htm | 
| Tendinema | Paraxonchiidae | omnivores | 4 | 8 | o4 | G7311mnu.htm | 
| Tenoranema | Capillariidae | animal parasites | ||||
| Tenuidraconema | Draconematidae | marine nematodes | G5386mnu.htm | |||
| Tenunemellus | Tylenchidae | plant feeders | 2 | 1 | h2 | G168mnu.htm | 
| Teporingonema | Cooperiidae | animal parasites | ||||
| Teratocephalus | Teratocephalidae | bacteria feeders | 3 | 3 | b3 | G311mnu.htm | 
| Teratodiplogaster | Diplogastridae | bacteria feeders | 1 | 3 | b1 | G3261mnu.htm | 
| Teratolobus | Cephalobidae | bacteria feeders | 2 | 3 | b2 | G2691mnu.htm | 
| Teratorhabditis | Rhabditidae | bacteria feeders | 1 | 3 | b1 | G2282mnu.htm | 
| Ternidens | Chabertiidae | animal parasites | ||||
| Terranova | Anisakidae | animal parasites | G9105mnu.htm | |||
| Terschellingia | Linhomoeidae | marine nematodes | G4021mnu.htm | |||
| Terschellingioides | Linhomoeidae | marine nematodes | ||||
| Tethystrongylus | Chabertiidae | animal parasites | ||||
| Tetleyus | Thelastomatidae | animal parasites | ||||
| Tetrabothiostrongylus | Mackerrastrongylidae | animal parasites | ||||
| Tetradonema | Tetradonematidae | animal parasites | G9541mnu.htm | |||
| Tetrameres | Tetrameridae | animal parasites | G9923mnu.htm | |||
| Tetylenchus | Dolichodoridae | plant feeders | 3 | 1 | h3 | G128mnu.htm | 
| Thada | Tylenchidae | plant feeders | 2 | 1 | h2 | G129mnu.htm | 
| Thainema | Ungellidae | animal parasites | ||||
| Thaistrongylus | Angiostrongylidae | animal parasites | G9585mnu.htm | |||
| Thalassironus | Ironidae | marine/fw nematodes | G5911mnu.htm | |||
| Thalassolaimus | Oxystominidae | marine/freshwater nematodes | ||||
| Thalassomonhystera | Monhysteridae | marine nematodes | G3781mnu.htm | |||
| Thalassonema | Marimermithidae | marine parasites | ||||
| Thaliostonema | Chabertiidae | animal parasites | ||||
| Thaumamermis | Mermithidae | animal parasites | ||||
| Thecavermiculatus | Heteroderidae | plant feeders | 3 | 1 | h3 | G130mnu.htm | 
| Theileriana | Strongylidae | animal parasites | ||||
| Thelandros | Oxyuridae | animal parasites | G996mnu.htm | |||
| Thelastoma | Thelastomatidae | animal parasites | G9754mnu.htm | |||
| Thelazia | Thelaziidae | animal parasites | G9903mnu.htm | |||
| Thelonema | Linhomoeidae | marine nematodes | ||||
| Theristus | Xyalidae | marine nematodes | G382mnu.htm | |||
| Thonus | Dorylaimidae | omnivores | 4 | 8 | o4 | G721mnu.htm | 
| Thoonchus | Enchelidiidae | marine nematodes | ||||
| Thoracostoma | Leptosomatidae | marine nematodes | ||||
| Thoracostomopsis | Thoracostomopsidae | marine predators | ||||
| Thornedia | Nordiidae | omnivores | 4 | 8 | o4 | G7138mnu.htm | 
| Thorneella | Thorniidae | omnivores | 4 | 8 | o4 | G7111mnu.htm | 
| Thornenema | Thornenematidae | omnivores | 5 | 8 | o5 | G710mnu.htm | 
| Thornia | Thorniidae | omnivores | 4 | 8 | o4 | G711mnu.htm | 
| Thorniosa | Thorniidae | omnivores | 4 | 8 | o4 | G717mnu.htm | 
| Thripinema | Allantonematidae | animal parasites | ||||
| Thubunaea | Physalopteridae | animal parasites | ||||
| Thylonema | Chabertiidae | animal parasites | ||||
| Thylostrongylus | Chabertiidae | animal parasites | ||||
| Tigronchoides | Anatonchidae | predators | 4 | 5 | p4 | G6601mnu.htm | 
| Timmia | Chromadoridae | marine nematodes | ||||
| Timminema | Thornenematidae | omnivores | 5 | 8 | o5 | G7088mnu.htm | 
| Timmungella | Ungellidae | animal parasites | ||||
| Timmus | Mydonomidae | omnivores | 4 | 8 | o4 | G7883mnu.htm | 
| Tlacuatzoxyuris | Oxyuridae | animal parasites | ||||
| Tobrilia | Tripylidae | predators | 3 | 5 | p3 | G626mnu.htm | 
| Tobriloides | Onchulidae | predators | 3 | 5 | p3 | G610mnu.htm | 
| Tobrilonchulus | Onchulidae | predators | 3 | 5 | p3 | |
| Tobrilus | Tobrilidae | predators | 3 | 5 | p3 | G601mnu.htm | 
| Tokorhabditis | Rhabditidae | bacteria feeders | 1 | 3 | b1 | G2225mnu.htm | 
| Tonoscolecinema | Drilonematidae | animal parasites | G1511mnu.htm | |||
| Torquenema | Chabertiidae | animal parasites | G9683mnu.htm | |||
| Torrestrongylus | Molineidae | animal parasites | ||||
| Torumanawa | Dorylaimidae | omnivores | 4 | 8 | o4 | G732mnu.htm | 
| Torynurus | Pseudaliidae | animal parasites | ||||
| Touzeta | Quimperiidae | animal parasites | ||||
| Toxascaris | Ascarididae | animal parasites | G9382mnu.thm | |||
| Toxocara | Ascarididae | animal parasites | G939mnu.htm | |||
| Trachactinolaimus | Actinolaimidae | omnivores | 5 | 8 | o5 | G7701mnu.htm | 
| Trachypharynx | Chabertiidae | animal parasites | ||||
| Trachypleurosum | Actinolaimidae | omnivores | 4 | 8 | o4 | G770mnu.htm | 
| Trakiosia | Thelastomatidae | animal parasites | ||||
| Travnema | Pharyngodonidae | animal parasites | ||||
| Travassosascaris | Ascarididae | animal parasite | ||||
| Travassosinema | Travassosinematidae | animal parasites | ||||
| Travassosnema | Guyanemidae | animal parasites | G9412mnu.htm | |||
| Travassosius | Trichostrongylidae | animal parasites | ||||
| Travassostrongylus | Viannaiidae | animal parasites | G3621mnu.htm | |||
| Trefusia | Trefusiidae | marine nematodes | ||||
| Trefusialaimus | Trefusiidae | marine nematodes | ||||
| Tremonema | Tylenchidae | plant feeders | 2 | 1 | h2 | G1681mnu.htm | 
| Triaulolaimus | Leptosomatidae | marine nematodes | ||||
| Tricaenonchus | Cobbonchidae | predators | 4 | 5 | p4 | |
| Tricephalobus | Panagrolaimidae | bacteria feeders | 1 | 3 | b1 | G284mnu.htm | 
| Triceratonema | Leptosomatidae | marine nematodes | ||||
| Trichenoplus | Enoplidae | marine nematodes | ||||
| Trichethmolaimus | Ethmolaimidae | marine nematodes | ||||
| Trichinella | Trichinellidae | animal parasites | G950mnu.htm | |||
| Trichochenia | Molineidae | animal parasites | ||||
| Trichodorus | Trichodoridae | plant feeders | 4 | 1 | h4 | G131mnu.htm | 
| Trichofreitasia | Heligmonellidae | animal parasites | ||||
| Trichohelix | Molineidae | animal parasites | ||||
| Tricholeiperia | Molineidae | animal parasites | ||||
| Tricholinstowia | Heligmonellidae | animal parasites | ||||
| Trichonchium | Leptonchidae | fungus feeders | 4 | 2 | f4 | |
| Trichoskrjabibia | Molineidae | animal parasites | ||||
| Trichosomoides | Trichosomoididae | animal parasites | ||||
| Trichospirura | Thelaziidae | animal parasites | ||||
| Trichostrongyella | Trichostrongylidae | animal parasites | ||||
| Trichostrongylus | Trichostrongylidae | animal parasites | G1103mnu.htm | |||
| Trichotheristus | Xyalidae | marine nematodes | G3824mnu.htm | |||
| Trichotravassosia | Heligmonellidae | animal parasites | ||||
| Trichotylenchus | Dolichodoridae | plant feeders | 3 | 1 | h3 | G132mnu.htm | 
| Trichromadora | Chromadoridae | narine nematodes | G4722mnu.htm | |||
| Trichuris | Trichuridae | animal parasites | G952mnu.htm | |||
| Tricirronema | Bicirronematidae | bacteria feeders | 2 | 3 | b2 | G919mnu.htm | 
| Tricoma | Desmoscolecidae | marine nematodes | G908mnu.htm | |||
| Tridentoinfundibulum | Strongylidae | animal parasites | G9786mnu.htm | |||
| Tridentulus | Monhysteridae | |||||
| Triepsilonema | Epsilonematidae | marine nematodes | G9021mnu.htm | |||
| Trifurcata | Molineidae | animal parasites | ||||
| Trigonostonema | Chabertiidae | animal parasites | ||||
| Thoracostomopsidae | marine nematodes | G596mnu.htm | ||||
| Trilobostrongylus | Angiostrongylidae | animal parasites | ||||
| Triodontolaimus | Triodontolaimidae | marine nematodes | ||||
| Triodontophorus | Strongylidae | animal parasites | G9792mnu.htm | |||
| Tripius | Sphaerulariidae | insect associate | 3 | 7 | d3 | |
| Tripyla | Tripylidae | predators | 3 | 5 | p3 | G621mnu.htm | 
| Tripylella | Tripylidae | predators | 3 | 5 | p3 | G625mnu.htm | 
| Tripylina | Trischistomatidae | predators | 3 | 5 | p3 | G624mnu.htm | 
| Tripylium | Monhysteridae | G3762mnu.htm | ||||
| Tripyloides | Tripyloididae | marine nematodes | ||||
| Trischistoma | Trischistomatidae | predators | 3 | 5 | p3 | G622mnu.htm | 
| Trissonchulus | Ironidae | marine/fw nematodes | ||||
| Triumphalisnema | Hystrignathidae | animal parasites | ||||
| Triversus | Dolichodoridae | plant feeders | 3 | 1 | h3 | G133mnu.htm | 
| Trochamus | Chromadoridae | marine nematodes | G4751mnu.htm | 
	|||
| Troglostrongylus | Crenosomatidae | animal parasites | G9591mnu.htm | |||
| Trophomera | Benthimermithidae | marine nematodes | ||||
| Trophomermis | Mermithidae | animal parasites | ||||
| Trophonema | Tylenchulidae | plant feeders | 3 | 1 | h3 | G134mnu.htm | 
| Trophotylenchulus | Tylenchulidae | plant feeders | 3 | 1 | h3 | G136mnu.htm | 
| Trophurus | Telotylenchidae | plant feeders | 3 | 1 | h3 | G135mnu.htm | 
| Trualaimus | Bicirronematidae | bacteria feeders | 2 | 3 | b3 | G9181mnu.htm | 
| Truttaedacnitis | Cucullanidae | animal parasites | ||||
| Truxonchus | Anatonchidae | predators | 4 | 5 | p4 | |
| Trypanoxyuris | Oxyuridae | animal parasites | ||||
| Tsuganema | Thelastomatidae | animal parasites | ||||
| Tubixaba | Aporcelaimidae | omnivores | 5 | 8 | o5 | G7382mnu.htm | 
| Tubolaimella | Leptosomatidae | marine nematodes | ||||
| Tubolaimoides | Tubolaimoididae | marine nematodes | ||||
| Tubolaimus | Monhysteridae | marine nematodes | ||||
| Tuerkiana | Leptosomatidae | marine nematodes | ||||
| Tumiota | Sphaeronematidae | plant feeders | 3 | 1 | h3 | G1232mnu.htm | 
| Tupaiostrongylus | Molineidae | animal parasites | G355mnu.htm | |||
| Turbatrix | Panagrolaimidae | bacteria feeders | 1 | 3 | b1 | G285mnu.htm | 
| Turgida | Physalopteridae | animal parasites | ||||
| Tutunema | Hethidae | animal parasites | ||||
| Tylaphelenchus | Aphelenchoididae | fungus feeders | 2 | 2 | f2 | G2193mnu.htm | 
| Tylenchocriconema | Tylenchulidae | plant feeders | 2 | 1 | h2 | G137mnu.htm | 
| Tylenchodoroides | Tylencholaimidae | fungus feeders | 4 | 2 | f4 | G7907mnu.htm | 
| Tylenchodorus | Tylencholaimidae | fungus feeders | 4 | 2 | f4 | G7908mnu.htm | 
| Tylencholaimellus | Tylencholaimellidae | fungus feeders | 4 | 2 | f4 | G785mnu.htm | 
| Tylencholaimus | Tylencholaimidae | fungus feeders | 4 | 2 | f4 | G786mnu.htm | 
| 
		 plant feeders  | 
		3 | 1 | h3 | G138mnu.htm | ||
| 
		 plant feeders  | 
		3 | 1 | h3 | G139mnu.htm | ||
| 
		 plant feeders  | 
		2 | 1 | h2 | G140mnu.htm | ||
| 
		 fungus feeders  | 
		4 | 2 | f4 | G7841mnu.htm | ||
| 
		 bacteria feeders  | 
		2 | 3 | b2 | G423mnu.htm | ||
| 
		 plant feeders  | 
		2 | 1 | h2 | G141mnu.htm | ||
| 
		 fungus feeders  | 
		3 | 2 | f3 | G803mnu.htm | ||
| 
		 fungus feeders  | 
		2 | 2 | f2 | G351mnu.htm | ||
| 
		 animal parasites  | 
		G1089mnu.htm | |||||
| Typhlopsia | Molineidae | animal parasites | ||||
| Rhabdolaimidae | 
		 bacteria feeders  | 
		3 | 3 | b3 | G462mnu.htm | |
| Telotylenchidae | plant feeders | 3 | 1 | h3 | G171mnu.htm | |
| Tylenchidae | plant feeders | 2 | 1 | h2 | G1682mnu.htm | |
| Umingmakstrongylus | Protosrongylidae | animal parasites | ||||
| Uncinaria | Ancylostomatidae | animal parasites | G961mnu.htm | |||
| Ungella | Ungellidae | animal parasites | ||||
| Unicorninema | Ungellidae | animal parasites | ||||
| Uniqaxonchium | Belondiridae | unknown | G7516mnu.htm | |||
| Urangabadensis | Axonolaimidae | marine nematodes | ||||
| Urbanonema | Hystrignathidae | animal parasites | ||||
| Urucuia | Carnoyidae | animal parasites | ||||
| Usarpnema | Desmoscolecidae | marine nematodes | ||||
| Utahnema | Leptonchidae | fungus feeders | 4 | 2 | f4 | G7821mnu.htm | 
| Valvaelaimus | Xyalidae | marine nematodes | G38327mnu.htm | |||
| Vanderlindia | Tylencholaimidae | fungus feeders | 4 | 2 | f4 | G791mnu.htm | 
| Varestrongylus | Protosrongylidae | animal parasites | G9326mnu.htm | |||
| Vasostoma | Comesomatidae | marine nematodes | G5881mnu.htm | |||
| Vaucherus | Herpetostrongylidae | animal parasites | ||||
| Veleshkinema | Sphaerulariidae | insect associate | 3 | 7 | d3 | |
| Ventelia | Hystrignathidae | animal parasites | ||||
| Verutus | Heteroderidae | plant feeders | 3 | 1 | h3 | G142mnu.htm | 
| Vexillata | Ornithostrongylidae | animal parasites | ||||
| Viannaia | Viannaiidae | animal parasites | G362mnu.htm | |||
| Viannella | Viannaiidae | animal parasites | ||||
| Viguiera | Habronematidae | animal parasites | G9462mnu.htm | |||
| Viscosia | Oncholaimidae | marine nematodes | G1527mnu.htm | |||
| Vittatidera | Heteroderidae | plant feeders | 3 | 1 | h3 | G153mnu.htm | 
| Viverrostrongylus | Angiostrongylidae | animal parasites | ||||
| Vogeloides | Pneumospiruridae | animal parasites | ||||
| Vogtnema | Atractidae | animal parasites | ||||
| Vulcanonema | Hystrignathidae | animal parasites | ||||
| Wachekitylenchus | Parasitylenchidae | animal parasites | ||||
| Waerebekeia | Carnoyidae | animal parasites | ||||
| Wakubitinema | Quimperiidae | animal parasites | ||||
| Wallabicola | Chabertiidae | animal parasites | G9684mnu.htm | |||
| Wanaristrongylus | Amphibiophilidae | animal parasites | ||||
| Wasimellus | Tylencholaimidae | fungus feeders | 4 | 2 | f4 | G7953mnu.htm | 
| Websternema | Molineidae | animal parasites | ||||
| Wellcomia | Oxyuridae | animal parasites | ||||
| Westindicus | Actinolaimidae | predators | 5 | 5 | p5 | G7611mnu.htm | 
| Wetanema | Thelastomatidae | animal parasites | ||||
| Wieseria | Oxystominidae | marine/freshwater nematodes | ||||
| Wiesoncholaimus | Oncholaimidae | marine nematodes | G15211mnu.htm | |||
| Willinema | Thornenematidae | omnivores | 5 | 8 | o5 | G7088mnu.htm | 
| Wilsonema | Plectidae | bacteria feeders | 2 | 3 | b2 | G424mnu.htm | 
| Woodwardostrongylus | Chabertiidae | animal parasites | ||||
| Woolleya | Herpetostrongylidae | animal parasites | ||||
| Wuchereria | Onchocercidae | animal parasites | G986mnu.htm | |||
| Wuia | Chabertiidae | animal parasites | ||||
| Wuinema | Quimperiidae | animal parasites | ||||
| Xennella | Xennellidae | marine nematodes | ||||
| Xenocriconemella | Criconematidae | plant feeders | 3 | 1 | h3 | G152mnu.htm | 
| Xenocyatholaimus | Cyatholaimidae | marine nematodes | ||||
| Xenolaimus | Xyalidae | marine nematodes | G38328mnu | |||
| Xericola | Heligmonellidae | animal parasites | ||||
| Xiphidorus | Longidoridae | plant feeders | 5 | 1 | h5 | G175mnu.htm | 
| Xiphinema | Longidoridae | plant feeders | 5 | 1 | h5 | G143mnu.htm | 
| Xiphinemella | Leptonchidae | fungus feeders | 4 | 2 | f4 | G7822mnu.htm | 
| Xustronema | Rhigonematidae | animal parasites | ||||
| Xyala | Xyalidae | marine nematodes | G387mnu.htm | |||
| Xylorhabditis | Rhabditidae | bacteria feeders | 1 | 3 | b1 | G0892mnu.htm | 
| Xystrognathus | Ichthyocephalidae | animal parasites | ||||
| Xyo | Hystrignathidae | animal parasites | G974mnu.htm | |||
| Xyzzors | Cyatholaimidae | marine nematodes | ||||
| Yagansiella | Ungellidae | animal parasites | ||||
| Yatinema | Heligmonellidae | animal parasites | G3637mnu.htm | |||
| Yeatesinia | Plectidae | bacteria feeders | 2 | 3 | b2 | G4224mnu.htm | 
| Ypsilon | Camacolaimidae | marine nematodes | G432mnu.htm | |||
| Ypsilonellus | Cephalobidae | bacteria feeders | 2 | 3 | b2 | |
| Zaglonema | Mackerrastrongylidae | animal parasites | ||||
| Zalonema | Desmodoridae | marine nematodes | G5329mnu.htm | |||
| Zalophora | Rhigonematidae | animal parasites | ||||
| Zeatylenchus | Anguinidae | plant feeders | 2 | 1 | h2 | G161mnu.htm | 
| Zeldia | Cephalobidae | bacteria feeders | 2 | 3 | b2 | G2612mnu.htm | 
| Zetalaimus | Leptonchidae | fungus feeders | 4 | 2 | f4 | G7791mnu.htm | 
| Zeylanema | Camallanidae | animal parasites | ||||
| Zoniolaimus | Chabertiidae | animal parasites | ||||
| Zullinius | Odontopharyngidae | predators | 1 | 5 | p1 | |
| Zygonemella | Xyalidae | marine nematodes | ||||
| Zygotylenchus | Pratylenchidae | plant feeders | 3 | 1 | h3 | G144mnu.htm | 
| Zygradus | Pratylenchidae | plant feeders | 3 | 1 | h3 | |