Diagnosis
provided by World Register of Marine Species
Test flat trochospiral to subplanispiral, adult bievolute, very broad peripheral keel projects forward beyond the lumen of the final chamber and produces distinct sinuate growth lines at each chamber, the carina of earlier whorls remaining as a plate that separates the successive whorls, spiral side somewhat inflated, and sutures radial and slightly depressed, up to three discrete whorls, ten to eleven saddlebaglike chambers comprising the final whorl, the two inequal lobes of each chamber separated by the forward carinal extension of the preceding chamber but connected by small tubular necks, supplementary chambers may occur on the side with the larger lobes, and final chamber may have an umbilical flange at the posterior margin, covering a supplemental opening into the chamber lumen; wall calcareous, of calcite, by X-ray determination, optically radial, finely perforate, carina imperforate, surface smooth; subequatorial aperture may be present at one side of the carina and slightly produced, but in some specimens the entire forward margin of the final chamber is tightly closed, leaving only the supplementary openings beneath the posterior umbilical margin of the smaller lobes. Miocene 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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Habitat
provided by World Register of Marine Species
Known from seamounts and knolls
Stocks, K. 2009. Seamounts Online: an online information system for seamount biology. Version 2009-1. World Wide Web electronic publication.
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- WoRMS Editorial Board