Top and bottom view of one specimen of Lingulina costata, view through slit-like aperture on filling with black/brown phosphorite minerals
The classification is based upon: The Fossil Foraminifera of the Tertiary Basin of Vienna,
Revision of the monograph by ALCIDE d'ORBIGNY (1846) by
ADOLF PAPP, MANFRED E. SCHMID,
ABHANDLUNGEN DER GEOLOGISCHEN BUNDESANSTALT, Band 37, Wien 1985