Ancolioceras opalinoides (Mayer 1864)

A conglomeration of 7 samples on one spot (one is on the back) along with the bivalve Entolium demissum and lots of shell substance. The block measures 24x22x5cm. From the Wutach Valley. Sinon Bank, Murchisonae Zone, Upper Aalenian. These were assigned to the genus Staufenia by Rieber in 1963, but Dietze, Rieber etal have revised the genera in December 2014 to the above.