| 词条 | Ussuritidae |
| 释义 |
| 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 }}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.[1] The Ussuritidae are most likely derived from the Dieneroceratidae[1] and give rise to the Discophyllitidae. Seven genera are included:
Genera are distinguished on the basis of shell morphology and characteristics of the suture.[1] Ussuritidae are also known as the Monophyllitidae, a junior synonym. Palaeophyllitidae, for Palaeophyllites, is sometimes found in the literature.[2] References1. ^1 2 Treatise on Invertebrate Paleontology Part L Mollusca 4, Ammonoidea {{Taxonbar|from=Q16993354}}{{Ammonitida-stub}}2. ^Paleobiology Database 3 : Ammonitida families|Triassic first appearances|Triassic extinctions |
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