Aca
- Acaenosquilla
- Acaeroplastes
- Acallocheirus
- Acanthacaris
- Acanthamunnopsis
- Acanthapseudes
- Acantharcturus
- Acanthaspidia
- Acanthaspidiidae
- Acanthastenasellus
- Acanthaxius
- Acanthephyra
- Acanthilia
†Acanthinopus Pinna 1974
- †Acanthinopus gibbosus Pinna 1974
Crustacea → Malacostraca → Decapoda
Acanthocarpus Stimpson, 1871
- Acanthocarpus alexandri Stimpson, 1871
- Acanthocarpus bispinosus A. Milne-Edwards, 1880
- Acanthocarpus brevispinis Monod, 1946
- Acanthocarpus delsolari Garth, 1973
- Acanthocarpus meridionalis Mané-Garzon, 1980
- †Acanthocarpus obscurus Rathbun 1918
Crustacea → Malacostraca → Decapoda → Heterotremata → Calappoidea → Calappidae
-
Acanthocarpus alexandri
- Acanthochondria
- Acanthochondrites
- Acanthocolax
- Acanthocope
- Acanthocyclops
- Acanthocyclus
- Acanthocythereis
- Acanthodiaptomus
- Acanthodillo
- Acanthodromia
Porodica Acanthogammaridae Garjajeff, 1901
- Acanthogammarinae Garjajeff, 1901
- Garjajewiinae Tachteew, 2001
- Hyalellopsinae Kamaltynov, 1999
- Parapallaseinae Kamaltynov, 1999
- Plesiogammarinae Kamaltynov, 1999
- Poekilogammarinae Kamaltynov, 1999
Crustacea → Malacostraca → Amphipoda → Gammarida → Gammaridira → Gammaroidea
Potporodica Acanthogammarinae Garjajeff, 1901
- Acanthogammarus Stebbing, 1899
- Boeckaxelia Schellenberg, 1940
- Brachyuropus Stebbing, 1899
- Brandtia Bate, 1862
- Carinurus Sowinsky, 1915
- Cheirogammarus Sowinsky, 1915
- Coniurus Sowinsky, 1915
- Cornugammarus Kamaltynov, 2002
- Dedyuola Kamaltynov, 2002
- Diplacanthus Kamaltynov, 2002
- Dorogammarus Bazikalova, 1945
- Dorogostaiskia Kamaltynov, 2002
- Issykogammarus Chevreux, 1908
- Metapallasea Bazikalova, 1959
- Oxyacanthus Kamaltynov, 2002
Crustacea → Malacostraca → Amphipoda → Gammaroidea → Acanthogammaridae
Acanthogammarus Stebbing, 1899
- Acanthogammarus (Acanthogammarus) Stebbing, 1899
- Acanthogammarus (Acanthogammarus) godlewskii (Dybowsky, 1874)
- Acanthogammarus (Acanthogammarus) gracilispinus Tachteew, 2001
- Acanthogammarus (Ancyracanthus) Kamaltynov, 2002
- Acanthogammarus (Ancyracanthus) lappaceus Tachteew, 2001
- Acanthogammarus (Ancyracanthus) maculosus Dorogostaisky, 1930
- Acanthogammarus (Ancyracanthus) victorii (Dybowsky, 1874)
Crustacea → Malacostraca → Amphipoda → Gammaroidea → Acanthogammaridae → Acanthogammarinae
- Acanthohaustorius
- Acantholeberidae
- Acantholeberis
- Acantholithodes
- Acantholithus
- Acantholobulus
- Acantholochus
†Acanthomeridion Hou et al. 1989
- †Acanthomeridion serratum Hou et al. 1989
Crustacea → Ostracoda → Bradoriida
- Acanthomolgus
- Acanthomunna
- Acanthomysis
- Acanthoniscus
- Acanthonotozoma
- Acanthonotozomella
- Acanthonotozomellidae
- Acanthonotozomoides
- Acanthonotozomopsis
- Acanthonyx
- Acanthophrys
- Acanthopotamon
- Acanthoscina
Acanthoserolis Brandt, 1988
- Acanthoserolis polaris (Richardson, 1911)
- Acanthoserolis schythei (Lütken, 1858)
Crustacea → Malacostraca → Isopoda → Sphaeromatidea → Seroloidea → Serolidae
- Acanthosquilla
- Acanthostepheia
- Acartia
- Acartiapotamon
- Acartiella
- Acartiidae
- Acartiidae
- Acasta
Acc
- Accalathura
- Accedomoera
Ace
- Aceroides
- Acetabulastoma
- Acetes
Ach
- Achaeopsis
- Achaeus
- Achelion
- Achelous
- Acheronia
- Achlidon
- Achtheres
Aci
- Acidops
- Acidopsidae
- Acidostoma
- Acinoproscelos
Acm
- Acmaeopleura
Aco
- Acontiostoma
- Acoridon
Acr
- Acrenhydrosoma
- Acrobelione
- Acrocalanus
- Acroperus
Act
- Actaea
- Actaecia
- Actaeciidae
Actaeodes Dana, 1851
- Actaeodes consobrinus (A. Milne-Edwards, 1873)
- Actaeodes hirsutissimus (Rüppell, 1830)
- Actaeodes inaequalis
- Actaeodes mutatus Guinot, 1976
- Actaeodes quinquelobatus Garth & Kim, 1983
- Actaeodes semoni (Ortmann, 1894)
- Actaeodes tomentosus (H. Milne Edwards, 1834)
Crustacea → Malacostraca → Decapoda → Xanthoidea → Xanthidae → Actaeinae
- Actaeomorpha
- Actenos
- Acteoniscus
- Actinacanthus
- Actinocythereis
- Actinoseta
Actiomera Ng, Guinot & Davie, 2008
- Actiomera boninensis (Odhner, 1925)
- Actiomera erythra (Lanchester, 1902)
- Actiomera lophopa (Alcock, 1898)
Crustacea → Malacostraca → Decapoda → Xanthidae → Liomerinae
Actopsyllus Wells, 1967
- Actopsyllus hartmannorum Kunz, 1971
- Actopsyllus longipes Wells, 1967
- Actopsyllus matthewi Bouck & Thistle, 2004
Crustacea → Multicrustacea → Copepoda → Harpacticoida → Miraciidae
Actumnus Dana, 1851
- Actumnus amirantensis Rathbun, 1911
- Actumnus antelmei Ward, 1942
- Actumnus arbutum Alcock, 1898
- Actumnus asper (Rüppell, 1830)
- Actumnus calypso (Herbst, 1801)
- Actumnus davaoensis Ward, 1941
- Actumnus digitalis (Rathbun, 1907)
- Actumnus dorsipes (Stimpson, 1858)
- Actumnus elegans de Man, 1888
- Actumnus fissifrons Alcock, 1898
- Actumnus forficigerus (Stimpson, 1858)
- Actumnus globulus Heller, 1861
- Actumnus granotuberosus Garth & Kim, 1983
- Actumnus griffini Takeda & Webber, 2006
- Actumnus intermedius Balss, 1922
- Actumnus margarodes MacGilchrist, 1905
- Actumnus marissinicus Takeda & Kim, 1977
- Actumnus miliaris A. Milne-Edwards, 1865
- Actumnus obesus Dana, 1852
- Actumnus parvulus A. Milne-Edwards, 1869
- Actumnus setifer (De Haan, 1835)
- Actumnus setosiareolatus Takeda, 1977
- Actumnus similis Takeda & Miyake, 1969
- Actumnus simplex Rathbun, 1911
- Actumnus squamosus (De Haan, 1835)
- Actumnus taiwanicus Ho, Yu & Ng, 2001
- Actumnus targionii Cano, 1889
- Actumnus tesselatus Alcock, 1898
Crustacea → Malacostraca → Decapoda → Heterotremata → Pilumnoidea → Pilumnidae → Pilumninae
Acu
- Acuminocythere
- Acuminodeutopus
- Acuticythereis
- Acutigebia
- Acutihumerus
Acutiserolis Brandt, 1988
- Acutiserolis gerlachei (Monod, 1925)
- Acutiserolis johnstoni (Hale, 1852)
- Acutiserolis luethjei (Wägele, 1986)
- Acutiserolis margaretae (Menzies, 1962)
- Acutiserolis neaera (Beddard, 1884)
- Acutiserolis poorei Brandt, 2009
- Acutiserolis spinosa (Kussakin, 1967)
Crustacea → Malacostraca → Isopoda → Sphaeromatidea → Seroloidea → Serolidae
- Acutomunna