Ranellidae Gray, 1854
Gelagna pallida (Parth, 1996)
Gelagna succincta (Linnaeus, 1771)
Pygmaeoseistron annulatacollare Loeblich & Tappan, 1994
Pygmaeoseistron cyrillion Loeblich & Tappan, 1994
Pygmaeoseistron flexum (Cushman & Gray, 1946)
Pygmaeoseistron hispidum (Reuss, 1863)
Pygmaeoseistron islandicum (R.W. Jones, 1984)
Pygmaeoseistron oceanicum (Albani, 1974)
Pygmaeoseistron treptoinum Loeblich & Tappan, 1994
