Cephalaspidea P. Fischer, 1883

Acrocolpus Cossmann, 1895

Acrostemma Cossmann, 1889

Actaeonellina Pchelintsev, 1963

Actaeonidae

Actaeonidea Gabb, 1872

Acteocinidae

Acteonellidae

Acteoninidae Pchelincev & Korobkov, 1960

Aglajidae Pilsbry, 1895

Aplustridae Gray, 1847

Blancia Bourguignat, 1875

Bulimactaeon Cossmann, 1891

Bullidae Rafinesque, 1815

Bullinidae Gray, 1850

Ceritella Lycett, 1850

Coeloscapha MacNeil, 1984

Consobrinella Haas, 1953

Cosmophiline Berger, 1953

Cylichnidae A. Adams, 1850

Cylichnopsis Cossmann, 1904

Cylindritella White, 1887

Diaphanidae Odhner, 1922

Douvilleia Fischer, 1883

Eotrochactaeon Akopyan, 1972

Euactaeonina Wenz, 1947

Euconactaeon Meek, 1863

Fictoacteon Stephenson, 1952

Gastropteridae Swainson, 1840

Globiconcha d'Orbigny, 1843

Goniocylindrites Meek, 1863

Hacobjania Aliev & Lysenko, 1986

Haminoeidae Pilsbry, 1895

Hamlinia Böhm, 1900

Hermania Monterosato, 1884

Hydatinidae Pilsbry, 1895

Ilbiidae Burn, 1963

Kleinacteon Vokes, 1939

Kolporetusa Försterling, Kadolsky & Morlo, 2002

Lithophysema Stewart, 1927

Maoriscaphander Dell, 1950

Megistostoma Gabb, 1864

Mesotrochactaeon Akopyan, 1972

Mexicotrochaetaeon

Millosevichia

Mirascapha Stewart, 1927

Mnestocylichnella Oppenheim, 1896

Moniliriretusa

Neocylindrites

Neotrochaetaeon

Noetca Stewart, 1927

Notodiaphanidae Thiele, 1931

Nucleopsis Conrad, 1865

Ongleya Finlay & Marwick, 1937

Orthoptyxis Yang & Wang, 1985

Ovulopsis Moericke, 1895

Palaeohydatina Cossmann, 1895

Palaeotrochactaeon Akopyan, 1972

Paleaglaja Anistratenko & Prisjazhnjuk, 1996

Parapuractaeon

Pchelincevella Dzhalilov, 1972

Peruviella Olsson, 1944

Philinidae Gray, 1850

Pirsila

Plicobulla Cossmann, 1895

Pseudavena Sacco, 1897

Pseudocassis Pictet & Campiche, 1863

Pseudonerinea Loriol, 1890

Ptychocylindrites Cossmann, 1895

Raincourtia Fischer, 1884

Retusidae Thiele, 1926

Rfemsia Chernyshev, 2000

Rhizoridae Dell, 1952

Ringiculella Bellardi & Sacco, 1892

Ringiculidae Philippi, 1853

Ringiculocosta Bellardi & Sacco, 1892

Ringiculoptycha Kropaczek, 1986

Roxaniella Monterosato, 1884

Runcinidae H. & A. Adams, 1854

Scaphandridae G.O. Sars, 1878

Scobinodola

Sevanella Akopyan, 1972

Smaragdinellidae Adams, 1848

Sogdianella Dzhalilov, 1972

Spiractaeon Meek, 1863

Striactaeonina Cossmann, 1895

Taita Laws, 1948

Trochactaeon Meek, 1863

Trochactaeonina Meek, 1863

Volvocylindrites Cossmann, 1895