The trilobite assemblage from the Huocheng Formation includes six genera: Calodiscus, Dinesus (= Erbia), Edelsteinaspis, Kootenia, Pagetides and Tannudiscus (Fig.
297-299) recognized a Sayan-Altaj (also spelt Altai or Altay) province, in which limestones hold a trilobite fauna characterized by the genera Kooteniella (?= Kootenia), Edelsteinaspis, Chondragraulos and Erbia (i.e.
Palmer (1968) compared the generotypes Dinesus ida and Erbia sibirica and concluded that they are generically different, the difference being the presence of a pair of isolated triangular elevated fields in front of the glabella only in Dinesus.