dcsimg

Diagnosis

provided by World Register of Marine Species
Test flaring, compressed, biserial throughout, early chambers added slightly more than 180¡ apart, resulting in a sigmoid alignment of chambers that at first form a tight low spire, later biserial chambers of increasing relative breadth resulting in a widening test and added more nearly in a single plane, periphery acutely angled or carinate, sutures slightly depressed; wall calcareous, of calcite by X-ray determination, optically granular, coarsely perforate, surface smooth or early stage may have short spinules; aperture an elongate oval at the inner margin of the final chamber, surrounded by a lip that grades laterally into the marginal keel, more rarely closed basally so that the opening is subterminal, situated a short distance above the chamber base, and provided with a simple twisted and flaring toothplate. Miocene to Holocene; cosmopolitan. (Loeblich & Tappan, 1987, Foraminiferal Genera and Their Classification)

Reference

Loeblich, A. R.; Tappan, H. (1987). Foraminiferal Genera and their Classification. Van Nostrand Reinhold Company, New York. 970pp.

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contributor
Tomas Cedhagen [email]