Ga
- Gammanema
- Gammarinema
Ge
- Geocenamus
Gl
- Globocephaloides
- Globocephalus
- Globodera
Gn
- Gnathostomatidae
- Gnomoxyala
Go
- Goezia
- Goffartia
- Gomphionema
- Gongylonema
- Gongylonematidae
- Gonionchus
- Goodeyus
Gr
Gracilacus Raski, 1962
- Gracilacus abietis (Eroshenko, 1974)
- Gracilacus aciculus (Brown, 1959)
- Gracilacus aculentus (Brown, 1959)
- Gracilacus anceps (Cobb, 1923)
- Gracilacus anchora Mohilal & Dhanachand, 2004
- Gracilacus aonli (Misra & Edward, 1971)
- Gracilacus bilineatus Brzeski, 1995
- Gracilacus brasiliensis Huang & Raski, 1986
- Gracilacus capitata Adams & Eichenmuller, 1962
- Gracilacus capitatus Adams & Eichenmuller, 1962
- Gracilacus colinus Huang & Raski, 1986
- Gracilacus corbetti (Ganguly & Khan, 1990)
- Gracilacus costatus Raski, 1976
- Gracilacus crenatus (Corbett, 1966)
- Gracilacus elegans Raski, 1962
- Gracilacus elongatus Abdel-Rahman & Maggenti, 1988
- Gracilacus enatus Raski, 1976
- Gracilacus epacris (Allen & Jensen, 1950)
- Gracilacus goodeyi (Oostenbrink, 1953)
- Gracilacus hamicaudata Cid del Prado Vera & Maggenti, 1988
- Gracilacus idalimus Raski, 1962
- Gracilacus intermedius Raski, 1962
- Gracilacus ivorensis (Luc & de Guiran, 1962)
- Gracilacus janai Baqri, 1979
- Gracilacus latescens Raski, 1976
- Gracilacus longilabiatus Huang & Raski, 1986
- Gracilacus macrodorus (Brzeski, 1963)
- Gracilacus marylandicus (Jenkins, 1960)
- Gracilacus micoletzkyi (Edward, Misra & Singh, 1967)
- Gracilacus mirus Raski, 1962
- Gracilacus mutabilis (Colbran, 1969)
- Gracilacus oostenbrinki (Misra & Edward, 1971)
- Gracilacus oryzae Sharma, Edward, Misra & Chandrashekar, 1992
- Gracilacus pandatus Raski, 1976
- Gracilacus parvulus Raski, 1976
- Gracilacus peperpotti Schoemaker, 1963
- Gracilacus peraticus Raski, 1962
- Gracilacus raskii Phukan & Sanwal, 1979
- Gracilacus robustus (Wu, 1974)
- Gracilacus solivagus Raski, 1976
- Gracilacus straeleni (de Coninck, 1931)
- Gracilacus teres Raski, 1976
- Gracilacus verus Brzeski, 1995
- Gracilacus yokooi Toida, Ohshima & Hirata, 1983
Nematoda → Secernentea → Tylenchida → Tylenchulidae
- Grahamius
- Granonchulus
- Graphidium
- Graphonema
- Greeffiella
- Greenenema
Gy
- Gyalocephalus
- Gymnolaimus