Moc
- Mocosoa
Mod
- Modiolicola
Mog
- Moguai
Moi
- Moina
- Moinidae
- Moinodaphnia
Mok
Mokuoloe J.L. Barnard, 1970
- Mokuoloe ninole J. L. Barnard, 1970
Crustacea → Malacostraca → Amphipoda → Gammaridea → Cyproideidae
Mol
- Mollicia
- Moloha
- Molotanaissus
Mom
- Momedossa
Mon
- Monacilla
- Mongoloniscus
- Monitus
- Monocletodes
- Monocorophium
- Monoculode
- Monoculodes
- Monoculopsis
- Monocyphoniscus
- Monodaeus
- Monodella
- Monodellidae
- Monodgnathia
- Monoditanais
- Monokalliapseudes
Monolistra Gerstaecker, 1856
- Monolistra (Microlistra) Gerstaecker, 1856
- Monolistra (Microlistra) bolei (Sket, 1960)
- Monolistra (Microlistra) calopyge Sket, 1982
- Monolistra (Microlistra) fongi Prevorènik, Verovnik, Zagmajster & Sket., 2010
- Monolistra (Microlistra) jalzici Prevorènik, Verovnik, Zagmajster & Sket., 2010
- Monolistra (Microlistra) pretneri Sket, 1964
- Monolistra (Microlistra) schottlaenderi Stammer, 1930
- Monolistra (Microlistra) sketi (Deeleman-Reinhold, 1971)
- Monolistra (Microlistra) spinosa (Racovitza, 1929)
- Monolistra (Microlistra) spinosissima (Racovitza, 1929)
- Monolistra (Monolistra) Gerstaecker, 1856
- Monolistra (Monolistra) caeca Gerstaecker, 1856
- Monolistra (Monolistra) monstruosa Sket, 1970
- Monolistra (Monolistrella) Sket, 1964
- Monolistra (Monolistrella) velkovrhi Sket, 1960
- Monolistra (Pseudomonolistra) Hubault, 1937
- Monolistra (Pseudomonolistra) bosnica Sket, 1970
- Monolistra (Pseudomonolistra) hercegoviniensis Absolon, 1916
- Monolistra (Pseudomonolistra) radjai Prevorcnik & Sket, 2007
- Monolistra (Typhlosphaeroma) Racovitza, 1910
- Monolistra (Typhlosphaeroma) bericum (Fabiani, 1901)
- Monolistra (Typhlosphaeroma) boldorii Brian, 1931
- Monolistra (Typhlosphaeroma) lavalensis Stoch, 1984
- Monolistra (Typhlosphaeroma) matjasici Sket, 1965
- Monolistra (Typhlosphaeroma) pavani Arcangeli, 1942
- Monolistra (Typhlosphaeroma) racovitzai Strouhal, 1928
Crustacea → Malacostraca → Isopoda → Sphaeromatoidea → Sphaeromatidae
- Monope
- Monoporeia
- Monopseudocuma
- Monospilus
- Monstrilla
- Monstrillidae
- Monstrillidae
- Monstrilloida
- Monstrilloida
- Monstrillopsis
- Monstrotanais
- Montucaris
Mop
Moplisa Moreira, 1974
- Moplisa sphaeromiformis (Mañe-Garzón, 1946) [1]
Crustacea → Malacostraca → Isopoda → Valvifera → Idoteidae
Mor
- Moraria
- Moreiradromia
- Moreirocarcinus
- Moritschus
- Morlockia
- Morlockiidae
- Morlockiidae
- Mormonilla
- Mormonillidae
- Mormonillidae
- Mormonilloida
- Mormonilloida
- Mortensenella
Moruloidea Baker, 1908
- Moruloidea darwinii (Cunningham, 1871)
- Moruloidea fraudatrix (Kussakin & Vasina, 1982)
- Moruloidea ornata (Kussakin & Vasina, 1982)
- Moruloidea perionasus Bruce, 2003
- Moruloidea tasmaniae (Baker, 1926)
- Moruloidea tumida Harrison, 1984
Crustacea → Malacostraca → Isopoda → Sphaeromatoidea → Sphaeromatidae
Mos
- Moserius
- Mossambicuma
Mot
- Mothocya