Diagnosis
provided by World Register of Marine Species
Test free, flaring in side view, quadrangular in section but rhomboid rather than rectangular, sides flattened, the distinctly angular posterior and lateral chamber margins resulting in a serrate test outline; chambers biserially arranged throughout; sutures slightly depressed; wall calcareous, hyaline oblique (optically granular), very thin, distinctly and coarsely perforate except for a narrow imperforate region adjacent to the aperture, perforations irregularly arranged and of varied size, wall surface smooth and polished; aperture an areal slit, commencing a slight distance above the base of the rhomboid apertural face near one edge and extending obliquely upward across the apertural face toward its midpoint, bordered by a distinct lip but not elevated on a neck. Holocene: Raine Island, Torres Straits, Coral Sea, at about 283 m; Rongelap, Marshall Islands, at 80 m to 300 m; W. Indian Ocean, off Mozambique, from 0.5 m to 3.7 m. (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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