Pyrgodiscus antiquus A.Forti & P.Schulz 1933: 244

Williams, David M. & Sims, Pat A., 2023, Notes on the diatom collection of the Natural History Museum, London (BM) VII: An account of some original specimens of Pyrgodiscus (Bacillariophyta) with notes on Stephanogonia (Bacillariophyta), Phytotaxa 589 (3), pp. 213-229 : 222

Pyrgodiscus antiquus A.Forti & P.Schulz 1933: 244 , pl. 3, fig. 9, 10 =?

TYPE:— GERMANY, “hannoverschen Gault” (Forti & Schulz 1933, ‘“ Gault ” Formation (Albian) near Hannover (northwest Germany)’, Gersonde & Harwood 1990: 367) .

Gersonde & Harwood commented on the locality, writing: “Unfortunately, Forti and Schulz 1933 [1932] did not indicate a type locality. According to Benda (1982), the deposit can no longer be located nor any original raw or type material” ( Gersonde & Harwood 1990: 367; see also Georgi 1976).