Diagnosis
provided by World Register of Marine Species
Planktonic in habit; test wall of perforate hyaline calcite, optically radiate, preferred crystal orientation with c-axis normal to surface; primary lamination bilamellar, secondary lamination due to addition of shell material during formation of new chamber; surface crust may develop at time of gametogenesis. M. Jurassic (Bathonian) to Holocene. (Loeblich & Tappan, 1987, Foraminiferal Genera and Their Classification)
Loeblich, A. R.; Tappan, H. (1987). Foraminiferal Genera and their Classification. Van Nostrand Reinhold Company, New York. 970pp.
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