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MarBEF Data System |
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WoRMS taxon details
From editor or global species database
Diagnosis Test with very low trochospiral to nearly planispiral coiling, biconvex, umbo of thickened shell material on the spiral side, the flatter umbilical side partially evolute, sutures nearly radial, slightly curved, depressed, periphery subacute; wall calcareous, finely perforate throughout with a darker and opaque band just below the peripheral keel on both sides; aperture a narrow interiomarginal slit beginning with an equatorial arch and extending onto the umbilical side along the entire base of the chamber, curving up at the preceding suture, partially covered by a large umbilical flap, flaps of earlier chambers remaining distinct for much of the final whorl before becoming obscured by later shell deposition. L. Oligocene to Holocene; North America; Pacific; Atlantic. (Loeblich & Tappan, 1987, Foraminiferal Genera and Their Classification) [details]
From editor or global species database
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