From editor or global species database
Diagnosis Test planispiral, involute, may uncoil in later stage; wall agglutinated, with outer imperforate layer and inner alveolar layer; aperture a low arch at or near the base of the apertural face, later may become areal. U. Paleocene to Holocene. (Loeblich & Tappan, 1987, Foraminiferal Genera and Their Classification) [details]