Ussuritidae Explained

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]

Notes and References

  1. [Treatise on Invertebrate Paleontology]
  2. http://paleodb.org/cgi-bin/bridge.pl Paleobiology Database