Diagnosis
provided by World Register of Marine Species
Test large, up to 5.5 mm in length, stout, with early trochospiral coil of four to five chambers per whorl, rapidly reducing to uniserial in the adult, chambers slightly inflated, somewhat overlapping previous chambers so that final chamber appears subconical, and previous chambers appear relatively short from the exterior, interior subdivided by vertical partitions projecting inward from the outer wall nearly but not quite to the center of the test, and extending from chamber floor to roof, sutures depressed; wall agglutinated, thick, commonly with calcareous particles in a considerable amount of light gray cement, and with occasional darker grains, surface smoothly finished; aperture terminal, slightly produced, commonly of one or more irregular, X-or V-shaped slits, and may have up to five separate small openings, or these may be connected in part to result in a triradiate or multiradiate opening. Eocene to Holocene; Europe; North America; West Indies; Pacific Ocean. (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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