Abstract: Recent unprecedented increases in comprehension of most aspects
  of the palaeobiology and biostratigraphy of Permian ammonoids have resulted
  in fairly adequate knowledge of most geographic and stratigraphic occurrences
  as well as most taxonomic groups.  Classification is based almost exclusively
  on clearly evident phyletic sequences, with the suture providing the key to
  recognition of evolutionary paths.  Goniatitida dominate Permian ammonoid
  faunas, but Prolecanitida extend from the Carboniferous into the Triassic,
  and a Mesozoic aspect to the faunas was established in the Dzhulflan and
  Changhsingian (uppermost Permian) with dramatic reduction in Goniatitida and
  concurrent diversification of the Ceratitina (Arnmonitida).  Permian ammonoids
  comprise two superfamilies (six families) of Prolecanitida, two superfamilies
  (three to as many as eight families) of Ceratitina, one superfamily (one family)
  of Tornoceratina, and ten superfamillies (17 families) of Goniatitina.  The
  popanoceratacean family Mongoloceratidae is new.