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)