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The lithostratigraphy and ammonite fauna of the Early Aalenian Opalinuston Formation (Zillhausen Member) at Donzdorf-Grünbach is described. A new chronospecies of Leioceras, L. hansrieberi, is erected. It characterizes the hansrieberi biohorizon of the Opalinum Subzone (Opalinum Zone). The macroconchs of L. hansrieberi represent the largest specimens hitherto described within the genus Leioceras. In addition, the associated macrofauna is described which allows to draw some conclusions on the palaeoecology of this locality.

The hansrieberi biohorizon (Aalenian; Opalinum Zone) in the Opalinuston Formation of Donzdorf-Grünbach (Eastern Swabian Alb, Germany)