Eoptychia abbreviata (FOSSIL) (de Koninck, 1881 †)
Plocezyga abolescens (FOSSIL) Knight, 1930 †
Plocezyga acuminata (FOSSIL) Hoare & Sturgeon, 1980 †
Pseudozygopleura acuminata (FOSSIL) Knight, 1930 †
Plocezyga angularis (FOSSIL) Knight, 1930 †
Pseudozygopleura angustata (FOSSIL) Hoare & Sturgeon, 1985 †
Pseudozygopleura assertonsoris (FOSSIL) Knight, 1930 †
Cyclozyga attenuata (FOSSIL) Hoare & Sturgeon, 1978 †
Hemizyga attenuata (FOSSIL) (Hoare & Sturgeon,1980 †)
Pseudozygopleura baltea (FOSSIL) Hoare & Sturgeon, 1985 †
Pseudozygopleura belli (FOSSIL) Carew, 1980 †
Hemizyga bilineata (FOSSIL) Batten, 1966 †
Hyphantozyga cancellata (FOSSIL) (Mark, 1912 †)
Cyclozyga carinata (FOSSIL) Knight, 1930 †
Eoptychia carinimaxima (FOSSIL) (Wang, 1987 †)
Microptychis cerithiformis (FOSSIL) (F.B. Meek& A.H. Worthen, 1860 †)
Levizygopleura charma (FOSSIL) Pan & Erwin, 2002 †
Pseudozygopleura cirritus (FOSSIL) Hoare & Sturgeon, 1985 †
Hemizyga clathratula (FOSSIL) (A.T. Young & Armstrong,1874 †)
Pseudozygopleura condrai (FOSSIL) Knight, 1930 †
Plocezyga conica (FOSSIL) Hoare & Sturgeon, 1980 †
Pseudozygopleura conica (FOSSIL) Knight, 1930 †
Microptychis constricta (FOSSIL) (J. de C. Sowerby,1821 †)
Pseudozygopleura contractus (FOSSIL) Hoare & Sturgeon, 1981 †
Plocezyga convertacostata (FOSSIL) Hoare, 1961 †
Pseudozygopleura convexus (FOSSIL) Batten, 1985 †
Hemizyga corbis (FOSSIL) Knight, 1930 †
Plocezyga cordiformis (FOSSIL) Hoare & Sturgeon, 1980 †
Plocezyga corona (FOSSIL) Knight, 1930 †
Gamizyga corpulentissima (FOSSIL) (Knight, 1930 †)
Plocezyga costata (FOSSIL) (Mark, 1912 †)
Helminthozyga costellata (FOSSIL) Hoare & Sturgeon, 1978 †
Stephanozyga crassa (FOSSIL) (J. Wanner, 1922 †)
Pseudozygopleura croneisi (FOSSIL) Knight, 1930 †
Pseudozygopleura cylindrata (FOSSIL) Knight 1930 †