View source for Order Cephalaspidea P. Fischer, 1883 (Bulliformes Férussac 1822)

===Family Diaphanidae Thiele 1931===
Genus Diaphana Brown 1837
*Diaphana minuta (Brown in Smith 1839) – marine, larvae in plankton are common from July till September – Т. Л. Беэр, a personal message

===Family Retusidae Thiele 1926===
Genus Retusa Brown 1827
*Retusa pertenuis (Mighels 1843) - marine, benthic, sublittoral – Броцкая и др., 1963.

===Family Scaphandridae G. O. Sars 1878===
Genus Cylichna Lovén 1846
*Cylichna alba (Brown 1827) - marine, benthic, sublittoral, common – Броцкая и др., 1963.
*Cylichna occulta (Mighels 1841) - marine, benthic, sublittoral

===Family Philinidae Gray 1840===
Genus Philine Ascanius 1772
*Philine lima (Brown 1827) – marine, benth., sublittoral, larvae are common in summer plankton (T.L. Baer, a personal message; I. Ekimova)

[[rus:Отряд Cephalaspidea P. Fischer, 1883 (Bulliformes Férussac 1822)]]