Diagnosis
provided by World Register of Marine Species
Test large, up to 3.1 mm in length, somewhat compressed, ovate in section, elongate ovate in outline, base rounded, slightly tapering distally, chambers biserially arranged, earliest ones slightly sigmoid and later more regular, overlapping previous chambers at the test margins, sutures distinct, strongly oblique; wall calcareous, perforate, radial, surface smooth; aperture terminal, radiate, surrounded by a hyaline collar. L. Oligocene to Holocene; Pacific; Japan; New Zealand; Canada: British Columbia; USA: California; Mexico. (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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