{{Short description|Extinct family of molluscs}} {{Automatic taxobox | fossil_range = {{fossil range|Triassic}} | image = Ussuritidae - Monophyllites sphaerophyllus.JPG | image_caption = Fossil of ''Monophyllites sphaerophyllus'' from Bosnia, on display at Galerie de paléontologie et d'anatomie comparée in Paris | taxon = Ussuritidae | authority = Hyatt, 1900 }}
'''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.<ref name = Treatise>Treatise on Invertebrate Paleontology Part L Mollusca 4, Ammonoidea</ref>
The Ussuritidae are most likely derived from the Dieneroceratidae<ref name = Treatise/> and give rise to the Discophyllitidae. Seven genera are included: *''Ussurites'' *''Palaeophyllites'' *''Monophyllites'' *''Majsvarites'' *''Leiophyllites'' *''Eopsiloceras'' *''Eophyllites'' Genera are distinguished on the basis of shell morphology and characteristics of the suture.<ref name = Treatise/>
Ussuritidae are also known as the Monophyllitidae, a junior synonym. Palaeophyllitidae, for ''Palaeophyllites'', is sometimes found in the literature.<ref>{{Cite web |url=https://www.paleodb.org/ |title=Paleobiology Database |access-date=2024-11-18 |archive-date=2007-10-01 |archive-url=https://web.archive.org/web/20071001114925/http://paleodb.org/cgi-bin/bridge.pl |url-status=dead }}</ref>
==References== {{Reflist}}
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Category:Ammonitida families Category:Triassic first appearances Category:Triassic extinctions
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