This is a list of freshwater species that have been reported from Japan in the literature. It only lists those that have been identified down to the species level (i.e. excludes Candona sp. 1, Cypridopsis cf. vidua etc). It includes some brackish water species that are occassionally found in freshwater habitats along coasts (marked with *).
Total = 93.

Order Podocopida

  Suborder Cypridocopina

    Superfamily Cypridoidea

      Family Candonidae

Physocypria biwaensis

        Subfamily Candoninae
           Candona candida (O. F. Mueller, 1776)
           Candonopsis kingsleii (Brady & Robertson, 1870)
           Candonopsis tenuis (Brady, 1886)
           Cryptocandona brehmi (Klie, 1934)
           Fabaeformiscandona akaina Smith & Janz, 2008
           Fabaeformiscandona condylea Smith & Janz, 2008
           Fabaeformiscandona dolabella Smith & Janz, 2008
           Fabaeformiscandona fabaeformis (Fischer, 1851)
           Fabaeformiscandona japonica (Okubo, 1990)
           Fabaeformiscandona myllaina Smith & Kamiya, 2007
           Fabaeformiscandona nishinoae Smith & Janz, 2008
           Fabaeformiscandona okuboi Smith & Janz, 2008
           Fabaeformiscandona paterea Smith & Janz, 2008
           Fabaeformiscandona pedana Smith & Janz, 2008
           Fabaeformiscandona tora Smith & Kamiya, 2007
           Fabaeformiscandona velifera Smith & Janz, 2008
           Fabaeformiscandona yajimae Smith & Janz, 2008
           Pseudocandona abei Smith & Janz, 2008
           Pseudocandona rostrata (Brady & Norman, 1889)
           Pseudocandona sarsi (Hartwig, 1899)
           Schellencandona yakushimaensis Smith & Kamiya, 2006

        Subfamily Cyclocypridinae
           Cyclocypris diebeli Absolon, 1973
           Cyclocypris ovum (Jurine, 1820)
           Cypria exsculpta (Fischer, 1855)
           Cypria konishii Smith & Kamiya, 2006
           Cypria matzkeae Smith & Janz, 2008
           Physocypria biwaensis (Okubo, 1990)
           Physocypria nipponica Okubo, 1990

        Subfamily Paracypridinae
           *Dolerocypria mukaishimensis Okubo, 1980
           *Paracypria adnata Smith & Kamiya, 2006
           *Paracypria inujimensis (Okubo, 1980)

      Family Cyprididae

        Subfamily Cyprettinae
           Cypretta seurati Gauthier, 1929

        Subfamily Cypricercinae
           Strandesia biwaensis Okubo, 2004
           Strandesia decorata (Sars, 1903)
           Strandesia vittata (Sars, 1903)
           Tanycypris pellucida (Klie, 1932)

        Subfamily Cypridinae
           Chlamydotheca arcuata (Sars, 1901)
           Cypris maculosa Bronstein, 1925
           Cypris subglobosa Sowerby, 1840

        Subfamily Cypridopsinae
           Cypridopsis biwaensis Okubo, 2004
           Cypridopsis nigrovittata Okubo, 1990
           Cypridopsis uenoi Brehm, 1933
           Cypridopsis vidua (O. F. Mueller, 1776)
           Potamocypris producta Sars, 1924
           Potamocypris sudzukii Okubo & Terauchi, 1992

        Subfamily Cyprinotinae
           Cyprinotus kimberleyensis McKenzie, 1966
           Cyprinotus uenoi Brehm, 1936
           Hemicypris kawagaensis Okubo, 2004
           Hemicypris megalops Sars, 1903
           Hemicypris okayamenesis Okubo, 2004
           Hemicypris ovata Moniez, 1892
           Hemicypris pyxidata Moniez, 1892
           Hemicypris vulgaris Okubo, 1990
           Heterocypris bulgarica Sywula, 1968
           Heterocypris incongruens (Ramdohr, 1808)
           Heterocypris kaufmanni (Vavra, 1906)
           Heterocypris rotundata (Bronstein, 1928)
           Heterocypris salina (Brady, 1868)
           Heterocypris sanukiensis Okubo, 2004

        Subfamily Dolerocypridinae
           Dolerocypris fasciata (O. F. Mueller, 1776)
           Dolerocypris ikayai Smith & Kamiya, 2006
           Dolerocypris sinensis Sars, 1903

        Subfamily Eucypridinae
           Eucypris pigra (Fischer, 1851)

        Subfamily Herpetocypridinae
           Candonocypris assimilis Sars, 1894
           Candonocypris caledonica (Mehes, 1939)
           Chrissia formosa (Klie, 1938)
           Chrissia vittata Okubo, 1974
           Herpetocypris chevreuxi (Sars, 1896)
           Herpetocypris reptans (Baird, 1835)
           Ilyodromus intermedia Okubo, 2004
           Stenocypris hirutai Smith & Kamiya, 2006
           Stenocypris hislopi Ferguson, 1969
           Stenocypris major (Baird, 1859)
           Stenocypris tsukagoshii Smith & Kamiya, 2006
           Stenocypris viridis Okubo, 1990

        Subfamily Scottinae
           Scottia birigida Smith et al, 2002

      Family Ilyocyprididae

        Subfamily Ilyocypridinae
           Ilyocypris dentifera Sars, 1903
           Ilyocypris japonica Okubo, 1990
           Ilyocypris nipponica Okubo, 2004

      Family Notodromadidae

        Subfamily Notodromadinae
           Notodromas monacha (O. F. Mueller, 1776)

  Suborder Cytherocopina

    Superfamily Cytheroidea

      Family Cytherideidae

           Cytherissa lacustris (Sars, 1863)

      Family Limnocytheridae

        Subfamily Limnocytherinae
           Limnocythere stationis Varva, 1891
           Limnocythere kamiyai Smith & Janz, 2009
           Limnocythere fude Smith & Janz, 2009
           Limnocythere levigatus Smith & Janz, 2009
           Limnocythere cyphoma Smith & Janz, 2009

        Subfamily Timiriaseviinae
           Metacypris digitiformis Smith & Hiruta, 2004

      Family Entocytheridae

           Uncinocythere occidentalis (Kozloff & Whitman, 1954)

Vestalenula cylindrica

  Suborder Darwinulocopina
    Superfamily Darwinuloidea
      Family Darwinulidae

           Darwinula stevensoni (Brady & Robertson, 1870)
           Vestalenula cornelia Smith et al., 2006
           Vestalenula cylindrica (Straub, 1952)
           Vestalenula lundi (Neale & Victor, 1978)
           Vestalenula molopoensis (Martens & Rossetti, 1997)

References