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- 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
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* Leiophyllites
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* 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. (en)
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- 1579 (xsd:nonNegativeInteger)
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- Fossil of Monophyllites sphaerophyllus from Bosnia, on display at Galerie de paléontologie et d'anatomie comparée in Paris (en)
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- 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. (en)
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