The Wuchiapingian (early Late Permian) ammonoid family Araxoceratidae shows a morphological spectrum that is recurring in the three genera Araxoceras (early Wuchiapingian; Transcaucasus-Iran), Vedioceras (late Wuchiapingian; ...

Early Changhsingian ammonoids from the Transcaucasus-NW Iranian region are poorly known. Here we revise the ammonoids of this interval based on new findings in sections of the Aras Valley and Ali Bashi Mountains of the ...