Ga
- Gabunillo
- Gabunoscia
- Gaetanus
- Gaetice
- Gaidiopsis
- Gaillardiellus
- Galacantha
- Galapalaophonte
- Galathea
- Galatheascus
- Galatheidae
- Galathella
- Galatheoidea
- Galathocrypta
- Galearctus
- Galene
- Galenidae
- Galilia
- Gallasellus
- Galziniella
- Gamboa
- Gammaracanthidae
- Gammaracanthus
- Gammarella
- Gammarellidae
- Gammarellus
- Gammaridae
Podred Gammaridea Latreille, 1802
- Acanthonotozomatidae Stebbing, 1906
- Acanthonotozomellidae Coleman & Barnard, 1991
- Alicellidae Lowry & De Broyer, 2008
- Amathillopsidae Pirlot, 1934
- Ampeliscidae Krøyer, 1842
- Amphilochidae Boeck, 1871
- Argissidae Walker, 1904
- Atylidae Lilljeborg, 1865
- Bateidae Stebbing, 1906
- Bolttsiidae Barnard & Karaman, 1987
- Cheidae Thurston, 1982
- Cheluridae Allman, 1847
- Colomastigidae Stebbing, 1899
- Condukiidae Barnard & Drummond, 1982
- Cressidae Stebbing, 1899
- Cyproideidae J.L. Barnard, 1974
- Dexaminidae Leach, 1814
- Didymocheliidae Bellan-Santini & Ledoyer, 1987
- Dikwidae Coleman & Barnard, 1991
- Epimeriidae Boeck, 1871
- Eusiroidea Bousfield, 1979
- Exoedicerotidae Barnard & Drummond, 1982
- Haustoriidae Stebbing, 1906
- Hyperiopsidae Bovallius, 1886
- Ipanemidae Barnard & Thomas, 1988
- Iphimediidae Boeck, 1871
- Lafystiidae Sars, 1893
- Laphystiopsidae Stebbing, 1899
- Lepechinellidae Schellenberg, 1926
- Leucothoidae Dana, 1852
- Liljeborgioidea Stebbing, 1899
- Lysianassoidea Dana, 1849
- Maxillipiidae Ledoyer, 1973
- Megaluropidae Thomas & Barnard, 1986
- Melphidippidae Stebbing, 1899
- Miramarassidae Lowry, 2006
- Nihotungidae J.L. Barnard, 1972
- Ochlesidae Stebbing, 1910
- Oedicerotidae Lilljeborg, 1865
- Pagetinidae K.H. Barnard, 1931
- Paracalliopiidae Barnard & Karaman, 1982
- Pardaliscidae Boeck, 1871
- Phoxocephalidae Sars, 1891
- Phoxocephalopsidae Barnard & Drummond, 1982
- Platyischnopidae Barnard & Drummond, 1979
- Pleustidae Buchholz, 1874
- Podosiridae Lowry & Myers, 2012
- Pontoporeioidea Dana, 1852
- Pseudamphilochidae Schellenberg, 1931
- Sebidae Walker, 1908
- Sicafodiidae Just, 2004
- Stegocephalidae Dana, 1855
- Stenothoidae Boeck, 1871
- Stilipedidae Holmes, 1908
- Synopiidae Dana, 1853
- Thurstonellidae Lowry & Zeidler, 2008
- Urohaustoriidae Barnard & Drummond, 1982
- Urothoidae Bousfield, 1978
- Valettiidae Stebbing, 1888
- Valettiopsidae Lowry & De Broyer, 2008
- Vicmusiidae Just, 1990
- Vitjazianidae Birstein & M. Vinogradov, 1955
- Zobrachoidae Barnard & Drummond, 1982
Crustacea → Malacostraca → Amphipoda
- Gammaroporeia
- Gammaroporeiidae
- Gammaropsis
- Gammarus
- 'gammarus'
- Gandalfus
- Gandoa
- Gangliopus
- Gareia
- Gariwerdeus
Potporodica Garjajewiinae Tachteew, 2001
- Eucarinogammarus Sowinsky, 1915
- Garjajewia Sowinsky, 1915
- Koshovia Bazikalova, 1975
- Paragarjajewia Bazikalova, 1945
Crustacea → Malacostraca → Amphipoda → Gammaroidea → Acanthogammaridae
- Garosyrrhoe
- Garthambrus
- Garthasia
- Garthiella
- Garthinia
- Garthiope
- Gastrodelphyidae
- Gastrodelphyidae
- Gastrodelphys
- Gastroptychus
- Gastrosaccus
- Gaudichaudia
- Gaussia
- Gaussicia
- Gaussicuma
Ge
Podred Gebiidea de Saint Laurent, 1979
- Axianassidae Schmitt, 1924
- Kuwaitupogebiidae Sakai, Türkay & Al Aidaroos, 2015
- Laomediidae Borradaile, 1903
- Thalassinidae Latreille, 1831
- Upogebiidae Borradaile, 1903
Crustacea → Malacostraca → Decapoda → Pleocyemata
- Gecarcinautes
- Gecarcinidae
- Gecarcinucidae
- Gecarcinucoidea
- Gecarcinucus
- Gecarcinus
- Gecarcoidea
- Geelvinkia
- Geeopsis
- Geithusa
- Gejavis
- Gelasimus
- Gelastocaris
- Gelsana
- Gemmotheres
- Genkaia
- Gennadas
Geocerceis Menzies & Glynn, 1968
- Geocerceis barbarae Menzies & Glynn, 1968
Crustacea → Malacostraca → Isopoda → Sphaeromatoidea → Sphaeromatidae
- Geocythere
- Geoffreya
- Geograpsus
- Georgeoplax
- Geosesarma
- Geothelphusa
- Gephyrocuma
- Gerufa
- Geryon
- Geryonidae
- Geyserius
Gi
- Gibbagnathia
- Gibbamblyops
- Gibberosus
- Gibberythrops
Gibbesia Manning & Heard, 1997
- Gibbesia neglecta (Gibbes, 1850)
- Gibbesia prasinolineata (Dana, 1852)
Crustacea → Malacostraca → Stomatopoda → Squilloidea → Squillidae
- Gibbosaverruca
Gigacuma Kurian, 1951
- Gigacuma halei Kurian, 1951 [1]
Crustacea → Malacostraca → Cumacea → Bodotriidae → Vaunthompsoniinae
Gigantapseudes Kudinova-Pasternak, 1978
- Gigantapseudes adactylus Kudinova-Pasternak, 1978
- Gigantapseudes maximus Gamô, 1984
Crustacea → Malacostraca → Tanaidacea → Apseudomorpha → Apseudoidea → Gigantapseudidae
Porodica Gigantapseudidae Kudinova-Pasternak, 1978
- Gigantapseudes Kudinova-Pasternak, 1978 [2]
Crustacea → Malacostraca → Peracarida → Tanaidacea → Apseudomorpha → Apseudoidea
Gigantione Kossmann, 1881
- Gigantione bouvieri Bonnier, 1900
- Gigantione elconaxii Markham, 1994
- Gigantione giardi Nobili, 1906
- Gigantione hainanensis An, Yu & Markham, 2009
- Gigantione hawaiiensis Danforth, 1967
- Gigantione ishigakiensis Shiino, 1941
- Gigantione moebii Kossmann, 1881
- Gigantione mortenseni Adkison, 1984
- Gigantione petalomerae Markham, 1999
- Gigantione pikei Page, 1985
- Gigantione pratti Danforth, 1967
- Gigantione rathbunae Stebbing, 1910
- Gigantione rhombos An, Yu & Markham, 2009
- Gigantione sagamiensis Shiino, 1958
- Gigantione tau An, Yu & Markham, 2009
- Gigantione uberlackerae Adkison, 1984
Crustacea → Malacostraca → Isopoda → Bopyroidea → Bopyridae → Pseudioninae
Gigantocypris Skogsberg, 1920
- Gigantocypris agassizii G. W. Müller, 1895 [3]
- Gigantocypris australis Poulsen, 1962 [3]
- Gigantocypris danae Poulsen, 1962 [3]
- Gigantocypris dracontovalis Cannon, 1940 [3]
- Gigantocypris muelleri Skogsberg, 1920 [3]
- Gigantocypris pellucida G. W. Müller, 1895 [3]
Crustacea → Ostracoda → Myodocopida → Cypridinoidea → Cypridinidae → Cypridininae → Gigantocypridinini
- Gilvossius
- Giranauria
- Gironomysis
- Gitana
- Gitanopsis
Gl
- Glaberarcturus
- Glabroapseudes
- Glabropilumnus
Glabroserolis Menzies, 1962
- Glabroserolis occidentalis Brandt & Brix, 2014
- Glabroserolis specialis Menzies, 1962
Crustacea → Malacostraca → Isopoda → Sphaeromatidea → Seroloidea → Serolidae
- Gladioferens
- Glassella
Glebocarcinus Nations, 1975
- Glebocarcinus amphioetus (Rathbun, 1898)
- Glebocarcinus oregonensis (Dana, 1852)
Crustacea → Malacostraca → Decapoda → Calappoidea → Heterotremata → Cancroidea → Cancridae
- Glencoeleberis
- Globarcturus
- Globarmadillo
- Globitelphusa
- Globonautes
- Globosolembos
- Gloiopotes
- Glomerulus
- Glossobius
- Glossocephalus
- Glypheidae
- Glypheoidea
- Glyphocrangon
- Glyphocrangonidae
- Glyphocuma
- Glyphus
- Glyptelasma
- Glyptidotea
- Glyptobairdia
- Glyptocarcinus
- Glyptograpsidae
- Glyptograpsus
- Glyptolithodes
- Glyptonotus
- Glyptoplax
- Glyptoxanthus
- Glypturus
Gn
- Gnathia
- Gnathiidae
- Gnatholana
- Gnathophausia
- Gnathophyllidae
- Gnathophylloides
- Gnathophyllum
- Gnathopleustes
- Gnathostenetroidae
- Gnathostenetroides
- Gnathostenetroidoidea
- Gnomoniscus
Gnorimosphaeroma Menzies, 1954
- Gnorimosphaeroma akanense Nunomura, 1998
- Gnorimosphaeroma albicauda Nunomura, 2005
- Gnorimosphaeroma anchialos Jang & Kwon, 1993
- Gnorimosphaeroma boninense Nunomura & Satake, 2006
- Gnorimosphaeroma chejuense Kim & Kim, 1988
- Gnorimosphaeroma chinense (Tattersall, 1921)
- Gnorimosphaeroma hachijoense Nunomura, 1999
- Gnorimosphaeroma hoestlandti Kim & Kwon, 1985
- Gnorimosphaeroma hokurikuense Nunomura, 1998
- Gnorimosphaeroma insulare (Van Name, 1940)
- Gnorimosphaeroma iriei Nunomura, 1998
- Gnorimosphaeroma izuense Nunomura, 2007
- Gnorimosphaeroma kurilense Kussakin, 1974
- Gnorimosphaeroma naktongense Kwon & Kim, 1987
- Gnorimosphaeroma noblei Menzies, 1954
- Gnorimosphaeroma oregonensis (Dana, 1853)
- Gnorimosphaeroma ovatum (Gurjanova, 1933)
- Gnorimosphaeroma paradoxa (Nunomura, 1988)
- Gnorimosphaeroma pulchellum Nunomura, 1998
- Gnorimosphaeroma rayi Hoestlandt, 1969
- Gnorimosphaeroma rebunense Nunomura, 1998
- Gnorimosphaeroma shikinense Nunomura, 1999
- Gnorimosphaeroma tondaense Nunomura, 1999
- Gnorimosphaeroma trigonocaudum Nunomura, 2011
- Gnorimosphaeroma tsutshimaense Nunomura, 1998
Crustacea → Malacostraca → Isopoda → Sphaeromatoidea → Sphaeromatidae
Go
- Godzilliidae
- Godzilliidae
- Godzilliognomus
- Godzillius
- Goesia
- Goffinella
- Goleathopseudione
- Gomeza
- Gomphocythere
- Gonatonotus
- Gondogeneia
- Gondwanothrichidae
- Gondwanothrix
- Goneplacidae
- Goneplacoidea
- Goneplacoides
- Goneplax
- Goniocyclops
- Gonioinfradens
- Goniopsis
- Goniopugettia
- Goniothorax
- Gonodactylaceus
- Gonodactylellu
- Gonodactylellus
- Gonodactylidae
- Gonodactylidea
- Gonodactyloidea
- Gonodactylus
- Gonopanope
- Gopkittisak
- Gordania
- Gordonella
- Gordonopsis
- Goreopagurus
- Gorgonariana
- Gorgoniscus
- Gorgonolaureus
- Gourretia
- Goyazana
Gr
- Gracilimesus
- Graeconiscus
- Grallatotanais
- Grammcythella
- Grandidierella
- Grandifoxus
- Grapsicepon
- Grapsidae
- Grapsion
- Grapsodius
- Grapsoidea
- Grapsus
- Graptoleberis
- Graviscalpellum
- Griceus
- Griffinia
- Grimaldina
- Gronella
- Grypachaeus
Gu
- Guaplax
- Gubernatoriana
- Guernea
- Guernella
- Guinoplax
- Guinotellus
- Guinothusa
- Guinotia
- Guinotinia
- Guinusia
- Guitonia
- Gulbarentsia
- Gulcamptus
- Gunenotophorus
- Gurjanopsis
- Gustavus
- Gutuapseudes
Gy
- Gyge
- Gymnerythrops
Pared Gymnomera Sars, 1865
- Haplopoda Sars, 1865 [4]
- Onychopoda Sars, 1865 [4]
Crustacea → Branchiopoda → Diplostraca → Onychocaudata → Cladoceromorpha → Cladocera
- Gymnoscalpellum
- Gynodiastylidae
- Gynodiastylis