original description(ofHeterohelix pachymarginata Stenestad, 1968 †)Stenestad, E. (1968). Three new species of Heterohelix Ehrenberg from the upper Senonian of Denmark. <em>Medd. Dansk Geol. Forening.</em> 18(1): 64-70.[details]
original description(ofGuembelina distorta Montanaro Gallitelli, 1955 †)Montanaro Gallitelli, E. (1955). Foraminiferi cretacei delle marne a fucoidi di Serramazzoni (Appennino modenese). <em>Accademia di Scienze Lettere ed Arti di Modena.</em> 5(13): 175-204.[details] Available for editors [request]