Ussuritidae

Ussuritidae are ancestral, Triassic, Phylloceratina characterized by generally smooth, discoidal, evolute shells with rounded venters and little or no ornamentation and by sutures with primitive monophyllitic saddles with a single terminal branch or leaflet.

The Ussuritidae are most likely derived from the Dieneroceratidae and give rise to the Discophyllitidae. Seven genera are included: Genera are distinguished on the basis of shell morphology and characteristics of the suture.
 * Ussurites
 * Palaeophyllites
 * Monophyllites
 * Majsvarites
 * Leiophyllites
 * Eopsiloceras
 * Eophyllites

Ussuritidae are also known as the Monophyllitidae, a junior synonym. Palaeophyllitidae, for Palaeophyllites, is sometimes found in the literature.