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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.〔Treatise on Invertebrate Paleontology Part L Mollusca 4, Ammonoidea〕 The Ussuritidae are most likely derived from the Dieneroceratidae〔 and give rise to the Discophyllitidae. Seven genera are included: *''Ussurites'' *''Palaeophyllites'' *''Monophyllites'' *''Majsvarites'' *''Leiophyllites'' *''Eopsiloceras'' *''Eophyllities'' 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.〔(Paleobiology Database )〕 ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ussuritidae」の詳細全文を読む スポンサード リンク
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