Pallaimorphina ruckerae Tappan, 1957
11-13: LowerCretaceous (Albian), Grandstand Formation, Simpson Test Well No. 1, Admiralty Bay, N. Alaska, USA. Spiral side, edge, and umbilical views of paratype, x 150 (from Tappan, 1957).
Copyright: Loeblich & Tappan, 1987