Ussuritidae

rdf:langString Ussuritidae

rdf:langString Hyatt, 1900

rdf:langString Fossil of Monophyllites sphaerophyllus from Bosnia, on display at Galerie de paléontologie et d'anatomie comparée in Paris

rdf:langString Ussuritidae

rdf:langString 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 and give rise to the Discophyllitidae. Seven genera are included: * Ussurites * Palaeophyllites * Monophyllites * * Leiophyllites * * Eophyllites Genera are distinguished on the basis of shell morphology and characteristics of the suture. Ussuritidae are also known as the Monophyllitidae, a junior synonym. Palaeophyllitidae, for Palaeophyllites, is sometimes found in the literature.