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Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Spiralia
Cladus: Lophotrochozoa
Phylum: Mollusca
Classis: Cephalopoda
Subclassis: † Ammonoidea
Ordo: † Ammonitida
Subordo: Phylloceratina
Superfamilia: Ussuritaceae

Familia: †Ussuritidae
Genera: Burijites - Eophyllites - Eopsiloceras - Indigirophyllites - Leiophyllites - Metatirolites - Mojsvarites - Monophyllites - Palaeophyllites - Simonyceras - Spinoleiophyllites - Ussurites - Wopfingites

Name

Ussuritidae Hyatt, 1900
References

The Paleobiology Database Accessed on 11/29/08

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:

Ussurites
Palaeophyllites
Monophyllites
Majsvarites
Leiophyllites
Eopsiloceras
Eophyllites

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]
References

Treatise on Invertebrate Paleontology Part L Mollusca 4, Ammonoidea
Paleobiology Database

Mollusca Images

Biology Encyclopedia

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