From editor or global species database
Diagnosis Test biserial in early stage, later may be uniserial; aperture terminal with bordering lip or rim and internal siphonlike toothplate that generally changes in orientation by 180¡ in successive chambers. U. Cretaceous (Turonian) to Holocene. (Loeblich & Tappan, 1987, Foraminiferal Genera and Their Classification) [details]