Keramosphaerina tergestina (Stache, 1889)

Description:

 Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification.  Van Nostrand, Reinhold Co. New York 1728 pp. Plate 428, Figs. 1-5: U. Cretaceous, Monte Lepini, Italy. 1, Noncentered tangential section about 1.5 mm from center, showing concentric appearance of structure toward center of section but with radial structure visible toward periphery, x 18; 2, section subtangential to outer surface, chambers showing elongate longitudinal sections in central region but a few cut transversely near periphery, x 25; 3, centered equatorial seciion showing proloculus and early coil of more than two chambers per whorl, x 50; 4, central part of centered equatorial section, wall partially recyrstallized and replaced by dolomite, x 80; 5, centered equatorial section showing streptospiral coiling, x 45 ( 1-5, from Devoto, 1964). courtesy of Michael Hesemann https://foraminifera.eu