9cm. The shell is weathered in such a way that the sutures are good to observe. This appears to be a form between Staufenia and Ludwigia, but it has more of the former about it than the latter. Found in the Staufensis Bank, upper Aalenian in the Wutach valley. 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.