†Polyptychites hapkei Jeletzky & Kemper 1988

Jeletzky & Kemper 1988. Comparative paleontology and stratigraphy of Valanginian Polyptychitinae and Simbirskitinae in Sverdrup Basin (Arctic Canada) and Lower Saxony Basin (northwest Germany). Geological Survey of Canada Bulletin, No. 377 1988: 1-355