Stellarticulina mutabilis (d'Orbigny, 1846)

Descrission:

Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification.  Van Nostrand, Reinhold Co. New York 1728 pp. Plate 331, Figs. 19-23: M. Miocene (Tortonian), Austria. 19, L. Tortonian, side view of specimen with initial stage preserved, originally identified as Articulina nodosaroides (Karrer), x 45 (from Luczkowska, 1974); 20-23, Badenian, Vienna Basin; 20, apertural view showing dentate margin, x 65; 21-23, side, front, and back views of early stage to show coil, x 65 (20-23, from Papp and Schmid, 1978).