ABSTRACT.  The generally accepted theory of a U-mode sutural ontogeny of prolecanitid ammonoids and their
  descendants is refuted.  The basic suture formula of the order Prolecanitida is E A L U I (not E L U2 U1 I), resembling
  that of derived members of the suborder Tornoceratina (their phylogenetic ancestors), and of the suborder Goniatitina.
  During phylogeny of the prolecanitids, secondary umbilical lobes are introduced and lead to multilobate foms.  In
  early ceratites, the original L lobe disappeared, and an increase in sutural elements took place by the introduction of
  supplementary U lobes.  Consequently, sutural nomenclature of Permian ceratites and Mesozoic ammonoids has to be
  modified.