Gastropoda Cuvier, 1797
Cyclozyga Knight, 1930
Eoptychia Longstaff, 1933
Helminthozyga Knight, 1930
Hemizyga Girty, 1915
Microptychis Longstaff, 1912
Palaeostylus Mansuy, 1914
Plocezyga Knight, 1930
Pseudozygopleura Knight, 1930
Stephanozyga Knight, 1930
