Diagnosis
provided by World Register of Marine Species
Test small, from 0.3 mm to 0.8 mm in diameter, forming a low trochospiral coil of five to seven narrow chambers per whorl, sutures very strongly curved backward at the periphery on the spiral side, the strong overlap resulting in semilunate appearing chambers around the open umbilicus on the opposite side, final chamber with a median umbilically directed projection that results in a superficial resemblance to the hyaline calcareous Neoconorbina, after the first one to one and a half whorls the chambers are partially subdivided by septula resulting from radial infoldings of the inner organic layer of the spiral septum that become more numerous in later chambers; wall imperforate, with inner organic layer and outer finely agglutinated layer, septa and septula with little or no foreign particles covering the organic layer; aperture interiomarginal, at the end of the umbilical projection of the final chamber. Holocene, shallow brackish water; NW Borneo. (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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