Foraminifera taxon details
From editor or global species database
Diagnosis Test of medium size, up to 8 mm in length, elongate ovate, subcylindrical to slightly fusiform, with bluntly to broadly rounded poles, large proloculus followed by up to about twenty planispiral whorls, chambers numerous, septa plane, unfluted, perpendicular to the outer wall; wall thin, undifferentiated in early whorls, later with tectum, light median layer corresponding to the keriotheca and thin inner layer; narrow and high parachomata present throughout growth and may reach the top of the chambers adjacent to the septa, appearing as septula in axial section; numerous foramina developed throughout growth, about fifty in outer whorls. L. Permian (Artinskian) to U. Permian (Tatarian); Japan; Viet Nam; China; USSR; USA: Washington. (Loeblich & Tappan, 1987, Foraminiferal Genera and Their Classification) [details]
From editor or global species database
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