Diagnosis
provided by World Register of Marine Species
Test free, numerous chambers in low trochospiral coil, increasing rapidly in size as added, sutures straight to gently curved, periphery rounded, peripheral outline slightly lobulate; wall agglutinated, thin and fragile, single layered, imperforate; primary aperture a curved or angled slit, beginning at the base of the apertural face in an equatorial position, and curving obliquely upward onto the umbilical side of the chamber, an arched supplementary opening present at the umbilical tip of each chamber or at the proximal side of the umbilical chamber extension so that it opens posteriorly rather than directly into the umbilicus, supplementary openings of previous chambers remaining open as sutural relict supplementary apertures. Holocene, from 30 m to 160 m; N. and S. Atlantic; Indian Ocean; S. Pacific. (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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