The order Cladocera is included in the class Branchiopoda, and forms a monophyletic group, which is currently divided into four suborders.
Around 620 species have been described, but many more species remain undescribed.
The genus Daphnia alone contains around 150 species.

These families are recognised:
Order Cladocera Latreille, 1829
Suborder Ctenopoda Sars, 1865
Holopediidae Sars, 1865
Sididae Baird, 1850
Suborder Anomopoda Stebbing, 1902
Bosminidae Baird, 1845
Chydoridae Stebbing, 1902
Daphniidae Straus, 1820
Gondwanotrichidae Van Damme et al.,
2007
Macrotrichidae Norman & Brady, 1867
Suborder Onychopoda Sars, 1865
Cercopagididae Mordukhai-Boltovskoi, 1968
Podonidae Mordukhai-Boltovskoi, 1968
Polyphemidae Baird, 1845
Suborder Haplopoda Sars, 1865
Leptodoridae Lilljeborg, 1900
The order Cladocera is included in the class Branchiopoda, and forms a monophyletic group, which is currently divided into four suborders. Around 620 species have been described, but many more species remain undescribed. The genus Daphnia alone contains around 150 species.
These families are recognised:
Order Cladocera Latreille, 1829
Suborder Ctenopoda Sars, 1865
Holopediidae Sars, 1865
Sididae Baird, 1850
Suborder Anomopoda Stebbing, 1902
Bosminidae Baird, 1845
Chydoridae Stebbing, 1902
Daphniidae Straus, 1820
Gondwanotrichidae Van Damme et al., 2007
Macrotrichidae Norman & Brady, 1867
Suborder Onychopoda Sars, 1865
Cercopagididae Mordukhai-Boltovskoi, 1968
Podonidae Mordukhai-Boltovskoi, 1968
Polyphemidae Baird, 1845
Suborder Haplopoda Sars, 1865
Leptodoridae Lilljeborg, 1900
Cladocera