Аннотация:Heteromorph ammonites from Ulyanovsk region (middle stream of Volga River) are
well-known due to their excellent preservation. We have already published the new data on the heteremorph ammonite assemblages, their stratigraphic and geographic distribution and environmental control (Baraboshkin, Mikhailova, 2002). Some unique finds like jaw apparatus inside the Australiceras body chamber were published (Doguzhaeva, Mikhailova, 2002). Recently the new data on the muscle impressions and ontogenetic development of Audouliceras were received.