Different views of one specimen of Heterostegina costata (former The classification is as Nummulites wrong)
The classification is based upon: The Fossil Foraminifera of the Tertiary Basin of Vienna,
Revision of the monograph by ALCIDE d'ORBIGNY (1846) Page 77 by
ADOLF PAPP, MANFRED E. SCHMID,
ABHANDLUNGEN DER GEOLOGISCHEN BUNDESANSTALT, Band 37, Wien 1985