Diagnosis
provided by World Register of Marine Species
Test attached, early stage probably free, ovate in outline, chambers in polymorphine or pyruline arrangement, low, strongly overlapping the earlier chambers and separated by oblique sutures, later with a narrow to broad keel-like to flangelike chamber attached to the substrate and surrounding the earlier part of the test; wall calcareous, hyaline, perforate radial, surface smooth; aperture terminal, slitlike. L. Cretaceous (Albian) to Holocene; cosmopolitan. (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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